android mobile app development grimoire

Admin Posts : 120 Join date : 2011-08-01

1 android studio
2 JDK
3A in android studio - virtual mobile machine :
tool strip, tools, AVD manager, in the now appeared window : +create device, select devices with
the google play store symbol, next, select version : oreo (download), wait... wait, wait some more

3B tool strip, tools, SDK manager, SDK platforms tab : those are the SDKs your app will support
choose : 4.3 and above: corresponding to API lvl : 15,18,25,27 those are the criticle ones.

3c choose the SDK tools tab, check the : sdk build tools, android emulator, android sdk platform tools,
android sdk tools, google play servicesgoogle play APK, google play licencing library, instant apps deployment SDK
intel x86 emulator

3d : click apply, wait.
4 alternative to VM : GenyMotion
it simulates physical devices as if they are actually connected to your machine.
so when you run the app it will show on connected devices.
https://www.genymotion.com/download/
choose the installation with VirtualBox
5 install Vysor to cast your android screen on to the computer
7 enable developer mode & USB debugging mode on your phone :
open your mobil device for developing search the walkthrough for your phone.
mostly it is : all apps, settings, build number, click build number 7 times, rego to
settings, developer options, enable debugging and usb debugging.

on android studio, tool strip, file, settings, appearance (for IDE visual customization)

8 enable virtual devices :
windows key + R
type msinfo32
search the field with hyper v virtualization, this must be enabled Fix VT-x is disabled in BIOS :

press and hold shift key and restart your computer
choose trouble shoot, advanced options, UEFI firmware options, restart.
choose bios settings, go to advanced tab, enable virtualization technology, exit with save changes.

9 with android studio some of the files it downloads need to be installed externally.
install : intelhaxm-android from : "C:\Users\Lenovo\AppData\Local\Android\Sdk\extras\intel\Hardware_Accelerated_Execution_Manager"
Lenovo = comuter name
(HAXM). now the emulator should work.

drunken

_________________
kurayami no kagi _____

Posts : 286 Join date : 2011-08-02

if you leave the project name as the default exercise it will not be uploadable to the google play store.

in the solution explorer window :
app :
java : where your activity code
res : layout : the activities xml files (how the app windows look (widgets))

the xml can be manipulated by drag droping in the design tab or with the text tab :

Code:: <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   tools:context=".MainActivity">

   <TextView
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="Hello World!"
   app:layout_constraintBottom_toBottomOf="parent"
   app:layout_constraintLeft_toLeftOf="parent"
   app:layout_constraintRight_toRightOf="parent"
   app:layout_constraintTop_toTopOf="parent" />

   <Button
   android:onClick="TestHelloWorld"
   android:id="@+id/button"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_alignParentStart="true"
   android:layout_centerVertical="true"
   android:layout_marginStart="63dp"
   android:text="Button" />

   <EditText
   android:id="@+id/editText"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_alignParentStart="true"
   android:layout_alignParentTop="true"
   android:layout_marginStart="16dp"
   android:layout_marginTop="81dp"
   android:ems="10"
   android:inputType="textPersonName" />

</RelativeLayout>

notice you need to change the 2nd line to RelativeLayout as you see above and
it automatically changes the corresponding closing tag.
also notive I added a btn and a textbox.

when you add in the btn the line :
android:onClick="TestHelloWorld"
it offers you to generate onClick event code in the X activity (main activity here)
in the java folder, 1st folder main activity make the code :

Code:: package com.example.lenovo.myapplication1;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
   EditText t1;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);
   Toast.makeText(getApplicationContext(), "moti", Toast.LENGTH_LONG).show();
   t1 = findViewById(R.id.editText); // links var to textbox
   }
// btn click event :
   public void TestHelloWorld(View view) {
   String str1 = t1.getText().toString();
   Toast.makeText(this,"moti rulz " + str1,Toast.LENGTH_LONG).show();
   }
}

run the code.

in the next code I harness the button and make its text display it's click count :

Code:: package com.example.lenovo.myapplication1;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
   EditText t1;
   Button btn1;
   int c =0;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);
   Toast.makeText(getApplicationContext(), "moti", Toast.LENGTH_LONG).show();
   t1 = findViewById(R.id.editText);
   btn1 = findViewById(R.id.button); // btn name id = button
   }

   public void TestHelloWorld(View view) {
   String str1 = t1.getText().toString();
   Toast.makeText(this,"moti rulz " + str1,Toast.LENGTH_LONG).show();
   c++;
   String sTemp = c + "";
   btn1.setText(sTemp);
   }
}

sometimes the IDE will mark some code with red as an error cause it needs to import stuff or what ever
so press alt + enter to fix it.

to create classes right click the solution explorer window, new, java class
press alt + insert to add setters getters and constructores geek

_________________
MB over and out _______________________

Posts : 286 Join date : 2011-08-02

_________________
MB over and out _______________________

Posts : 286 Join date : 2011-08-02

the following app builds a toast message using radio group buttons +
pile of check boxes.
the cassier will select his problem (radio)
the cassier will select person to summon (check box)
a message is built accordingly
the controllers (radio group, check boxes are reset)

xml design (solution explorer, res folder, layout):

Code:: <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   tools:context=".MainActivity">

   <TextView
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:id="@+id/txtName"
   android:text="Hello World!"
   app:layout_constraintBottom_toBottomOf="parent"
   app:layout_constraintLeft_toLeftOf="parent"
   app:layout_constraintRight_toRightOf="parent"
   app:layout_constraintTop_toTopOf="parent" />
   
   
   
   <RadioGroup
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:id="@+id/radioGroup"
   android:layout_below="@id/txtName">

   <RadioButton
   android:id="@+id/rbChange"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="need change" />

   <RadioButton
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="permission to return product"
   android:id="@+id/rbReturn"/>

   <RadioButton
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="else"
   android:id="@+id/rbElse"/>
   </RadioGroup>
   <CheckBox
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="send to vice"
   android:id="@+id/chkVice"
   android:layout_below="@id/radioGroup"/>
   <CheckBox
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="send to manager"
   android:id="@+id/chkManager"
   android:layout_below="@id/chkVice"/>
   <CheckBox
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="send to supervisor"
   android:id="@+id/chkSupervisor"
   android:layout_below="@id/chkManager"/>
   <CheckBox
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="send to coWorker"
   android:id="@+id/chkTall"
   android:layout_below="@id/chkSupervisor"/>
   <Button
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="summon"
   android:id="@+id/btnOrder"
   android:textAllCaps="false"
   android:layout_below="@id/chkTall"
   android:layout_centerHorizontal="true"
   android:onClick="summon"
   />
</RelativeLayout>

main activity (fire up when the app starts) :
(solution explorer, java folder, 1st sub folder):

Code:: package com.example.lenovo.cassiersummoner;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
   Button btnCbOrder;
   RadioGroup radioCbGroup;

   TextView txtCbName;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);
   btnCbOrder = findViewById(R.id.btnOrder);
   radioCbGroup = findViewById(R.id.radioGroup);
   txtCbName = findViewById(R.id.txtName);
   }
   public void summon(View view) {
   StringBuffer buffer = new StringBuffer();
   buffer.append("Hello, " + "\n");
   buffer.append(((CheckBox)(findViewById(R.id.chkManager))).isChecked() ? "\nmanager" : "");
   buffer.append(((CheckBox)(findViewById(R.id.chkVice))).isChecked() ? "\nvice" : "");
   buffer.append(((CheckBox)(findViewById(R.id.chkSupervisor))).isChecked() ? "\nsupervisor" : "");
   buffer.append(((CheckBox)(findViewById(R.id.chkTall))).isChecked() ? "\nworker" : "");
   buffer.append(" " + getSummon());
   Toast.makeText(this,buffer.toString() ,Toast.LENGTH_LONG).show();
   resetForm();
   }
   public void resetForm(){
   ((CheckBox)(findViewById(R.id.chkManager))).setChecked(false);
   ((CheckBox)(findViewById(R.id.chkSupervisor))).setChecked(false);
   ((CheckBox)(findViewById(R.id.chkTall))).setChecked(false);
   ((CheckBox)(findViewById(R.id.chkVice))).setChecked(false);
   radioCbGroup.clearCheck();
   txtCbName.setText("");
   }

   public String getSummon(){
   switch (radioCbGroup.getCheckedRadioButtonId()){
   case R.id.rbChange:
   return "change needed";
   case R.id.rbReturn:
   return "customer wants to return a product";
   case R.id.rbElse:
   return "need you at the register";
   default:
   return "test message";
   }
   }
}

_________________
MB over and out _______________________

Posts : 286 Join date : 2011-08-02

spinner controller (see comments for Xplnation)

xml design :

Code:: <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   tools:context=".MainActivity">

   <Spinner
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   android:textAlignment="center"
   android:id="@+id/spnNames"/>
   <Button
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:id="@+id/btnAdd"
   android:text="Add"
   android:textAllCaps="false"
   android:layout_below="@id/spnNames"
   android:layout_alignParentRight="true"
   android:onClick="newName"
   />
   <EditText
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   android:id="@+id/txtName"
   android:layout_below="@id/spnNames"
   android:hint="Enter Name..."
   android:layout_toLeftOf="@id/btnAdd"
   android:textAlignment="center"/>

</RelativeLayout>

main activity :

Code:: package com.example.lenovo.spinner;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
   // shadow clone the controllers declaration
   Spinner spnCbNames;
   EditText txtCbName;
   List<String> lstNames;
   ArrayAdapter<String> arrayAdapter;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);
   lstNames = new ArrayList<>();
   initControllers(); // connect shallow clones to controllers
   arrayAdapter = new ArrayAdapter<String>(this,
   android.R.layout.simple_spinner_dropdown_item,
   lstNames); // link spinner to its components :
   spnCbNames.setAdapter(arrayAdapter);
   // get the selected item
   //spnCbNames.getSelectedItem();
   // listener - to perform an action when item is selected
   spnCbNames.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
   @Override
   public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
   Toast.makeText(MainActivity.this,
   lstNames.get(position), Toast.LENGTH_SHORT).show();
   // lstNames.get(position) returns the item itself not a position
   }

   @Override
   public void onNothingSelected(AdapterView<?> parent) {

   }
   });
   }

   private void initControllers(){
   spnCbNames = findViewById(R.id.spnNames);
   txtCbName = findViewById(R.id.txtName);
   }

   public void newName(View view) {
   // btn on click event summoned from the xml file of the activity
   lstNames.add(txtCbName.getText().toString());
   txtCbName.setText("");
   arrayAdapter.notifyDataSetChanged(); // updates the spinner organs
   }
}

_________________
MB over and out _______________________

Posts : 286 Join date : 2011-08-02

xml design code (activity_main.xml):

Code:: <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   tools:context=".MainActivity"
   android:id="@+id/mainActivityLayout"
   >

   <TextView
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="Hello World!"
   app:layout_constraintBottom_toBottomOf="parent"
   app:layout_constraintLeft_toLeftOf="parent"
   app:layout_constraintRight_toRightOf="parent"
   app:layout_constraintTop_toTopOf="parent" />

</RelativeLayout>

notice in the above code I named the layout :
android:id="@+id/mainActivityLayout"
and the 1st line was changed to : <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

main activity code (mainActivity.java):

Code:: package com.example.lenovo.screenbg;

import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.RelativeLayout;

public class MainActivity extends AppCompatActivity {
   RelativeLayout r1;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);
   r1 = findViewById(R.id.mainActivityLayout);
   r1.setBackgroundDrawable(ContextCompat.getDrawable(this,R.drawable.aoitori));
   }
}

finally the aoitori.jpg picture was added to the res, drawable in the solution explorer window

_________________
MB over and out _______________________

Posts : 286 Join date : 2011-08-02

simple list view :

xml

Code:: <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   tools:context=".MainActivity">

   <EditText
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   android:id="@+id/txtItem"
   android:textAlignment="center"
   android:hint="enter Item"
   />
   <Button
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="save"
   android:textAllCaps="false"
   android:id="@+id/btnSave"
   android:layout_below="@id/txtItem"
   android:layout_centerHorizontal="true"
   android:onClick="newItem"
   />
   
   <ListView
   android:id="@+id/simpleListView"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:divider="#f00"
   android:dividerHeight="1dp"
   android:layout_below="@id/btnSave"
   />

</RelativeLayout>

activity code :

Code:: package com.example.lenovo.mylistview2;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
   private List<String> words;
   private ListView lv1;
   private EditText txtItem;
   private ArrayAdapter<String> arrayAdapter;

   @Override
   protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);
   words = new ArrayList<>();
   lv1 = findViewById(R.id.simpleListView);
   txtItem = findViewById(R.id.txtItem);
   arrayAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_activated_1,words);
   lv1.setAdapter(arrayAdapter);
   }

   public void newItem(View view) {
// btn xml onClick event
   words.add(txtItem.getText().toString());
   txtItem.setText("");
// update list view (lv1) with the words in the list words
   arrayAdapter.notifyDataSetChanged();
   }
}

_________________
MB over and out _______________________

Posts : 286 Join date : 2011-08-02

polimarization !!!

exmple : contact list
each contact has : image name phone number

main activity xml :

Code:: <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   tools:context=".MainActivity">

   <EditText
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   android:id="@+id/txtName"
   android:textAlignment="center"
   android:hint="Enter Item"/>
   <EditText
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   android:id="@+id/txtPhone"
   android:textAlignment="center"
   android:layout_below="@id/txtName"
   android:hint="Enter Item"/>
   <RadioGroup
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:id="@+id/radioGroupImg"
   android:layout_below="@id/txtPhone"
   android:layout_centerHorizontal="true"
   android:orientation="horizontal">
   <RadioButton
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="work"
   android:id="@+id/rbWork"
   android:checked="true"/>
   <RadioButton
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="cell"
   android:id="@+id/rbCell"/>
   <RadioButton
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="Home"
   android:id="@+id/rbHome"/>

   </RadioGroup>

   <Button
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="Save"
   android:textAllCaps="false"
   android:id="@+id/btnSave"
   android:layout_below="@id/radioGroupImg"
   android:layout_centerHorizontal="true"
   android:onClick="newContact"/>

   <ListView
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   android:id="@+id/lstItems"
   android:divider="#f00"
   android:dividerHeight="1dp"
   android:layout_below="@id/btnSave"/>

</RelativeLayout>

partinias xml = custom list view element inflation appearans:

Code:: <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
   xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="match_parent"
   android:layout_height="wrap_content">

   <ImageView
   android:layout_width="45dp"
   android:layout_height="45dp"
   android:id="@+id/imgContact"
   android:src="@mipmap/ic_launcher"
   android:layout_margin="5dp"/>

   <TextView
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:id="@+id/lblName"
   android:layout_toRightOf="@id/imgContact"
   android:layout_toEndOf="@id/imgContact"
   android:text="Contact Name"
   android:textSize="16dp"
   android:layout_centerVertical="true"
   android:layout_marginLeft="8dp"/>

   <EditText
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   android:id="@+id/txtContactName"
   android:layout_centerVertical="true"
   android:layout_toRightOf="@id/imgContact"
   android:layout_toEndOf="@id/imgContact"
   android:visibility="invisible"
   android:layout_toLeftOf="@id/btnEdit"
   android:layout_toStartOf="@id/btnEdit" />

   <ImageButton
   android:layout_width="45dp"
   android:layout_height="45dp"
   android:id="@+id/btnEdit"
   android:src="@drawable/edit"
   android:layout_toLeftOf="@id/btnDel"
   android:layout_centerVertical="true"
   android:visibility="invisible"
   />
   <ImageButton
   android:layout_width="45dp"
   android:layout_height="45dp"
   android:id="@+id/btnDel"
   android:src="@drawable/del"
   android:layout_toLeftOf="@id/btnDone"
   android:layout_centerVertical="true"
   android:visibility="invisible"
   />
   <ImageButton
   android:layout_width="45dp"
   android:layout_height="45dp"
   android:id="@+id/btnDone"
   android:src="@drawable/save"
   android:layout_alignParentRight="true"
   android:layout_centerVertical="true"
   android:visibility="invisible"
   />

</RelativeLayout>

contact java class :

Code:: package com.justforum.yotamarker.contacts;

import android.support.annotation.DrawableRes;

public class Contact {

   private String name;
   private String phone;
   // Will limit the image variable to get only R.drawable.something as int value
   private @DrawableRes int image;

   public Contact(String name, int image, String phone) {
   this.name = name;
   this.image = image;
   this.phone = phone;
   }

   public String getName() {
   return name;
   }

   public void setName(String name) {
   this.name = name;
   }

   public @DrawableRes int getImage() {
   return image;
   }

   public String getPhone() {
   return phone;
   }

   public void setPhone(String phone) {
   this.phone = phone;
   }

   public void setImage(@DrawableRes int image) {
   this.image = image;
   }
}

regex java class

Code:: package com.justforum.yotamarker.contacts;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class regexifier {
   public static String regexChecker(String theRegex, String str2Check) {
   // You define your regular expression (REGEX) using Pattern
   Pattern checkRegex = Pattern.compile(theRegex);
   // Creates a Matcher object that searches the String for
   // anything that matches the REGEX
   Matcher regexMatcher = checkRegex.matcher(str2Check);
   // Cycle through the positive matches and print them to screen
   // Make sure string isn't empty and trim off any whitespace
   while (regexMatcher.find()) {
   if (regexMatcher.group().length() != 0) {
   return regexMatcher.group().trim();
// System.out.println(regexMatcher.group().trim());
// // You can get the starting and ending indexs
// System.out.println("Start Index: " + regexMatcher.start());
// System.out.println("Start Index: " + regexMatcher.end());
   }
   }
   return "err";
   }
}

example partinias java class (adjusted for the contact class):
fuses main xml's listview with partinias xml

Code:: package com.justforum.yotamarker.contacts;

import android.app.Activity;
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.content.ContextCompat;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.ArrayList;

public class partinias extends ArrayAdapter {

   private ArrayList<Contact> arrayList;
   private Activity mActivity;
   public partinias(@NonNull Activity context, int resource, ArrayList<Contact> arrayList) {
   super(context, resource);
   this.arrayList = arrayList;
   this.mActivity = context;
   }

   // will help the ListView to know how many items need to be created
   @Override
   public int getCount() {
   return arrayList.size();
   }

   @NonNull
   @Override
   public View getView(int position, @Nullable View view, @NonNull ViewGroup parent) {

   LayoutInflater inflater = mActivity.getLayoutInflater();
   // attachToRoot - if the layout is inside the root layout, or in a different layout
   view = inflater.inflate(R.layout.partinias, parent, false);

   TextView lblCbName = view.findViewById(R.id.lblName);
   ImageView imgCbContact = view.findViewById(R.id.imgContact);

   Contact contact = arrayList.get(position);

   lblCbName.setText(contact.getName() + " " + contact.getPhone());
   imgCbContact.setImageDrawable(ContextCompat.getDrawable(mActivity, contact.getImage()));

   return view;
   }
}

main activity :

Code:: package com.justforum.yotamarker.contacts;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.ListView;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class MainActivity extends AppCompatActivity {
   // Class Variables, will live through the Class life cycle.
   EditText txtCbName;
   EditText txtPhone;
   RadioGroup radioGroupCbImg;
   ListView lstCbContacts;
   ArrayList<Contact> contactsList;
   partinias adapter;
   int lastPosition = 0;

   @Override
   protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);
   // Point to all ID's in XML, using variables
   initControllers();
   contactsList = new ArrayList<>();
   adapter = new partinias(this,
   R.layout.partinias, contactsList);
   lstCbContacts.setAdapter(adapter);
   setListViewListener();
   }

   public void initControllers(){
   // Assign the variables to the object using findViewById to find the object with ID
   txtCbName = findViewById(R.id.txtName);
   txtPhone = findViewById(R.id.txtPhone);
   radioGroupCbImg = findViewById(R.id.radioGroupImg);
   lstCbContacts = findViewById(R.id.lstItems);
   }

   public void setListViewListener(){
   lstCbContacts.setOnItemClickListener(new AdapterView.OnItemClickListener() {
   @Override
   public void onItemClick(AdapterView<?> parent, View view, final int position, long id) {
   // Will clear the last clicked item and return it back to normal;
   clearLastCheckedItem();
   ImageButton btnCbDel = view.findViewById(R.id.btnDel);
   ImageButton btnCbEdit = view.findViewById(R.id.btnEdit);
   ImageButton btnCbDone = view.findViewById(R.id.btnDone);
   btnCbDel.setVisibility(View.VISIBLE);
   btnCbEdit.setVisibility(View.VISIBLE);
   btnCbDone.setVisibility(View.VISIBLE);
   final EditText txtCbContactName = view.findViewById(R.id.txtContactName);
   final TextView lblCbName = view.findViewById(R.id.lblName);
   btnCbDel.setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View v) {
   contactsList.remove(position);
   adapter.notifyDataSetChanged();
   }
   });
   btnCbEdit.setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View v) {
   txtCbContactName.setText(lblCbName.getText().toString());
   txtCbContactName.setVisibility(View.VISIBLE);
   lblCbName.setVisibility(View.INVISIBLE);
   }
   });
   btnCbDone.setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View v) {
   String value = txtCbContactName.getText().toString();
   String newphone = regexifier.regexChecker("([0][0-9]{9})",value);
   value = value.substring(0,value.indexOf(" "));

   if(!value.isEmpty()){
   contactsList.get(position).setName(value);
   contactsList.get(position).setPhone(newphone);
   }
   adapter.notifyDataSetChanged();
   }
   });
   lastPosition = position;
   }
   });
   }

   // Check which Radio Button checked by the user
   public int chosenImage(){
   switch (radioGroupCbImg.getCheckedRadioButtonId()){
   case R.id.rbHome:
   return R.drawable.home;
   case R.id.rbCell:
   return R.drawable.phone;
   case R.id.rbWork:
   return R.drawable.work;
   default:
   return R.mipmap.ic_launcher;
   }
   }
   public void newContact(View view) {
   String phoneNumInput = regexifier.regexChecker("([0][0-9]{9})", txtPhone.getText().toString());
   if(phoneNumInput=="err"){
   Toast.makeText(this,"phone number must be 10 digits and start with 0", Toast.LENGTH_LONG).show();
   txtPhone.setText("");
   }else{
   contactsList.add(new Contact(txtCbName.getText().toString(), chosenImage(), phoneNumInput));
   txtCbName.setText("");
   txtPhone.setText("");
   adapter.notifyDataSetChanged();
   }
   }

   public void clearLastCheckedItem(){
   try{
   View lastChild = lstCbContacts.getChildAt(lastPosition);
   lastChild.findViewById(R.id.btnDel).setVisibility(View.INVISIBLE);
   lastChild.findViewById(R.id.btnEdit).setVisibility(View.INVISIBLE);
   lastChild.findViewById(R.id.btnDone).setVisibility(View.INVISIBLE);
   lastChild.findViewById(R.id.txtContactName).setVisibility(View.INVISIBLE);
   lastChild.findViewById(R.id.lblName).setVisibility(View.VISIBLE);

   }
   catch (NullPointerException e){
   e.printStackTrace();
   }

   }
}

_________________
MB over and out _______________________

Posts : 286 Join date : 2011-08-02

xml beefup :

linear layouts :

Code:: <LinearLayout
   xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:orientation="vertical"
   android:gravity="center">

   <TextView
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="Hello World!1"
   android:id="@+id/lbl1"
   />
   <TextView
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="Hello World!2"
   android:id="@+id/lbl2"
   android:layout_gravity="left"
   />
   <TextView
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="Hello World!3"
   android:id="@+id/lbl3"
   android:layout_gravity="right"
   />

</LinearLayout>

LinearLayout : makes the controllers align in theire declaired sequence.
android:gravity="center" sets the controller on the middle

android:layout_gravity="right" declared in the controller effects only that controller

wrapping a controller group in a layout :

Code:: <?xml version="1.0" encoding="utf-8"?>
<LinearLayout
   xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:orientation="vertical"
   >

   <TextView
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="Hello World!1"
   android:id="@+id/lbl1"
   android:layout_gravity="center"
   />

   <LinearLayout
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_gravity="center"
   android:orientation="horizontal">
   <Button
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="btn1"/>
   <Button
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="btn2"/>
   <Button
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="btn3"/>

   </LinearLayout>
   <Button
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="btn4"
   android:layout_gravity="right"/>

   <LinearLayout
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_gravity="right"
   android:orientation="vertical">
   <Button
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="btn5"/>
   <Button
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="btn6"/>

   </LinearLayout>

</LinearLayout>

Relative Layouts :

Code:: <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   tools:context=".MainActivity">

   <TextView
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="Hello World!1"
   android:id="@+id/lbl1"/>

   <TextView
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="Hello World!2"
   android:id="@+id/lbl2"
   android:layout_centerInParent="true"/>

   <TextView
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="Hello World!3"
   android:id="@+id/lbl3"
   android:layout_toRightOf="@id/lbl2"
   android:layout_toEndOf="@id/lbl2" />

   <TextView
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="Hello World!5"
   android:id="@+id/lbl5"
   android:layout_alignParentLeft="true"
   android:layout_centerVertical="true"
   />

   <TextView
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="Hello World!6"
   android:id="@+id/lbl6"
   android:layout_alignParentRight="true"
   android:layout_centerVertical="true"
   android:textColor="#a5000000"
   />

</RelativeLayout>

android:layout_centerInParent="true" sets controller in the middle

android:layout_toRightOf="@id/lbl2"
android:layout_toEndOf="@id/lbl2"
sets controller as said

android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
sets controller to the left and vrtically in the middle (height)

android:layout_alignParentRight="true"
android:layout_centerVertical="true"
like the previous but to the right

setting Linear layout image + text color to matrix style
add the matrix3 background to the drawable folder in the res folder

xml :

Code:: <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   tools:context=".MainActivity"
   android:gravity="center"
   android:id="@+id/mainActivityLayout"
   >

   <EditText
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="Hello World!"
   android:textColor="#037117"
   android:hint="matrix style"
   />

</LinearLayout>

main activity :

Code:: package com.justforum.yotamarker.myapplication;

import android.annotation.SuppressLint;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;

import static com.justforum.yotamarker.myapplication.R.id.mainActivityLayout;

public class MainActivity extends AppCompatActivity {
   LinearLayout r1;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);
   r1 = findViewById(R.id.mainActivityLayout);
   r1.setBackgroundDrawable(ContextCompat.getDrawable(this,R.drawable.matrix3));
   // alt + enter was clicked
   }
}

if any red text errors in code click on them + alt + enter

_________________
MB over and out _______________________

Posts : 286 Join date : 2011-08-02

create two activities with buttons

in solution explorer window right click layout folder in res folder, new, activity, empty activity

main activity xml:

Code:: <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="First Activity"
android:id="@+id/lblFirst"
android:layout_centerHorizontal="true"
android:textSize="25dp"/>

<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/txtFirstContent"
android:hint="Enter First Content"
android:layout_centerInParent="true"
android:textAlignment="center"/>

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btnFirstIntent"
android:text="First To Second"
android:textAllCaps="false"
android:layout_centerHorizontal="true"
android:layout_below="@id/txtFirstContent"
android:onClick="intentFirstToSecond"/>

</RelativeLayout>

change the 2nd activity (I named it activityx) xml :

Code:: <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".activityX"
android:background="#344955">

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Second Activity"
android:id="@+id/lblSecond"
android:layout_centerHorizontal="true"
android:textColor="#d0d0d0"
android:textSize="25dp"/>

<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/txtSecondContent"
android:hint="Enter First Content"
android:layout_centerInParent="true"
android:textColor="#d0d0d0"
android:textColorHint="#d0d0d0"
android:textAlignment="center"/>

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btnSecondIntent"
android:text="Second To First"
android:textAllCaps="false"
android:layout_centerHorizontal="true"
android:layout_below="@id/txtSecondContent"
android:onClick="intentSecondToFirst"/>

</RelativeLayout>

main activity c0de :

Code:: package com.justforum.yotamarker.myapplication;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

EditText txtCbFirstContent;
TextView lblCbFirst;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

txtCbFirstContent = findViewById(R.id.txtFirstContent);
lblCbFirst = findViewById(R.id.lblFirst);
Bundle bundle = getIntent().getExtras();

if(bundle != null){
lblCbFirst.setText(bundle.getString("secondContent", "No Content Found"));
}
}

public void intentFirstToSecond(View view) {
Intent intent = new Intent(MainActivity.this, activityX.class);
intent.putExtra("firstContent", txtCbFirstContent.getText().toString());

startActivity(intent);

finish();
}
}

2nd activity code :

Code:: package com.justforum.yotamarker.myapplication;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

public class activityX extends AppCompatActivity {

EditText txtCbSecondContent;
TextView lblCbSecond;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_x);
txtCbSecondContent = findViewById(R.id.txtSecondContent);
lblCbSecond = findViewById(R.id.lblSecond);
Bundle bundle = getIntent().getExtras();

lblCbSecond.setText(bundle.getString("firstContent", "No Content Found"));

}

public void intentSecondToFirst(View view) {
Intent intent = new Intent(activityX.this, MainActivity.class);
intent.putExtra("secondContent", txtCbSecondContent.getText().toString());

startActivity(intent);

}
}

Intent intent = new Intent(MainActivity.this, activityX.class);
intent.putExtra("firstContent", txtCbFirstContent.getText().toString());

puts data from this activity in a bundle which is summonable from the summoned activity at :
startActivity(intent);

finish(); kills the activity.

Bundle bundle = getIntent().getExtras();

lblCbSecond.setText(bundle.getString("firstContent", "No Content Found"));

gets the data from the summoning activity (it is a dictionary : data key = "firstContent", value = txtCbFirstContent.getText().toString())
if no data is found the default data would be : "No Content Found"

now add a button to link to the summoning of a different activity from each activity.

_________________
MB over and out _______________________

Posts : 286 Join date : 2011-08-02

custom grid view jutsu :

png images allow to see the background behind the character in said image
I added miku1.png - miku8.png to the drawable folder.

main xml

Code:: <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   tools:context=".MainActivity">

   <TextView
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="Hello World!"

   app:layout_constraintBottom_toBottomOf="parent"
   app:layout_constraintLeft_toLeftOf="parent"
   app:layout_constraintRight_toRightOf="parent"
   app:layout_constraintTop_toTopOf="parent" />

   <GridView
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:id="@+id/gridview1"
   android:numColumns="3"
   android:stretchMode="columnWidth"
   ></GridView>

</LinearLayout>

gridView partinias (image + label):

Code:: <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
   xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
   android:layout_height="match_parent">
   <ImageView
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:id="@+id/icons"
   android:layout_marginLeft="8dp"
   android:layout_marginTop="8dp"
   android:src="@drawable/miku1"

   />

   <TextView
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="partinias label"
   android:id="@+id/pix"
   android:layout_below="@+id/icons"
   android:layout_marginTop="15dp"
   android:layout_marginLeft="40dp"

   />
</RelativeLayout>

grid adapter java class with images and texts array as in the above partinias:

Code:: package com.justforum.yotamarker.mygridview;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

public class GridAdapter extends BaseAdapter{

   private int icons[];
   private String pix[];
   private Context context;
   private LayoutInflater inflater;

   public GridAdapter(Context context,int icons[], String pix[]){
   this.context = context;
   this.icons = icons;
   this.pix = pix;

   }

   @Override
   public int getCount() {
   return pix.length;
   }

   @Override
   public Object getItem(int position) {
   return pix[position];
   }

   @Override
   public long getItemId(int position) {
   return position;
   }

   @Override
   public View getView(int position, View convertView, ViewGroup parent) {
   View gridView = convertView;
   if(convertView == null){

   inflater = (LayoutInflater)context.getSystemService(context.LAYOUT_INFLATER_SERVICE);
   gridView = inflater.inflate(R.layout.grid_partinias,null);

   }
   ImageView icon = (ImageView)gridView.findViewById(R.id.icons);
   TextView pix = gridView.findViewById(R.id.pix);
   icon.setImageResource(icons[position]);
   pix.setText(this.pix[position]);

   return gridView;
   }
}

main java :

Code:: package com.justforum.yotamarker.mygridview;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
   GridView gridView;
   String txts[]={"miku1","miku2","miku3","miku4","miku5","miku6","miku7","miku8"};
   int pictu[] = {R.drawable.miku1,R.drawable.miku2,R.drawable.miku3,R.drawable.miku4,R.drawable.miku5,R.drawable.miku6,R.drawable.miku7,R.drawable.miku8};

   @Override
   protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);

   gridView = findViewById(R.id.gridview1);
   GridAdapter adapter = new GridAdapter(MainActivity.this,pictu,txts);
   gridView.setAdapter(adapter);
   gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
   @Override
   public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
   Toast.makeText(MainActivity.this, "hello " + txts[position], Toast.LENGTH_LONG).show();
   }
   });
   }
}

_________________
MB over and out _______________________

Posts : 286 Join date : 2011-08-02

the following shows an app with 3 btn each one's click event summons a differt type of alert dialog:
regular, list, custom

main activity xml :

Code:: <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   tools:context=".MainActivity">

   <LinearLayout
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_centerInParent="true"
   android:orientation="vertical">
   <Button
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   android:text="Open Regular AlertDialog"
   android:textAllCaps="false"
   android:id="@+id/btnRegAD"
   android:onClick="onRegularAlertDialog"
   android:layout_gravity="center"/>
   <Button
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   android:text="Open List AlertDialog"
   android:textAllCaps="false"
   android:id="@+id/btnListAD"
   android:onClick="onListAlertDialog"
   android:layout_gravity="center"/>
   <Button
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="Open Custom View AlertDialog"
   android:textAllCaps="false"
   android:id="@+id/btnCustomAD"
   android:onClick="onCustomAlertDialog"
   android:layout_gravity="center"/>
   </LinearLayout>

</RelativeLayout>

custom alert xml design :

Code:: <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:orientation="vertical" android:layout_width="match_parent"
   android:layout_height="wrap_content">

   <LinearLayout
   android:layout_width="match_parent"
   android:layout_height="wrap_content">
   <TextView
   android:layout_width="0dp"
   android:layout_height="wrap_content"
   android:text="UserName:"
   android:layout_weight="0.22"/>
   <EditText
   android:layout_width="0dp"
   android:layout_height="wrap_content"
   android:hint="Enter User Name"
   android:textAlignment="center"
   android:layout_weight="0.7"
   android:id="@+id/txtUser"/>
   </LinearLayout>
   <LinearLayout
   android:layout_width="match_parent"
   android:layout_height="wrap_content">
   <TextView
   android:layout_width="0dp"
   android:layout_height="wrap_content"
   android:text="Password:"
   android:layout_weight="0.22"/>
   <EditText
   android:layout_width="0dp"
   android:layout_height="wrap_content"
   android:hint="Enter Password"
   android:textAlignment="center"
   android:layout_weight="0.7"
   android:inputType="textVisiblePassword"
   android:id="@+id/txtPass"/>
   </LinearLayout>

   <CheckBox
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="Show/Hide Password"
   android:id="@+id/chkPassword"
   android:checked="true"/>

</LinearLayout>

main activity code :

Code:: package com.justforum.yotamarker.alert1;

import android.content.DialogInterface;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.method.HideReturnsTransformationMethod;
import android.text.method.PasswordTransformationMethod;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

   @Override
   protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);
   }
   public void onRegularAlertDialog(View view) {
   final AlertDialog.Builder builder = new AlertDialog.Builder(this);
   builder.setTitle("My First Alert Dialog");
   builder.setMessage("Hello,\n This is my first alert dialog.\n Please, don't try to click No");
   builder.setCancelable(false);

   builder.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
   @Override
   public void onClick(DialogInterface dialog, int which) {
   Toast.makeText(MainActivity.this, "Thank you for listening", Toast.LENGTH_LONG).show();
   dialog.dismiss();
// dialog.cancel();
// cancel - using dismiss + fire OnCancelListener event:
// builder.setOnCancelListener(new DialogInterface.OnCancelListener() {
// @Override
// public void onCancel(DialogInterface dialog) {
//
// }
// });
   }
   });

   builder.setNegativeButton("No", new DialogInterface.OnClickListener() {
   @Override
   public void onClick(DialogInterface dialog, int which) {
   Toast.makeText(MainActivity.this, "shiku shiku", Toast.LENGTH_LONG).show();
   builder.show();
   }
   });

   AlertDialog dialog = builder.create();

   dialog.show();
   }

   public void onListAlertDialog(View view) {
   List<String> lstItems = new ArrayList<String>();
   lstItems.add("Honda");lstItems.add("Suzuki");lstItems.add("Toyota");lstItems.add("Lexus");
   lstItems.add("Hyundai");lstItems.add("Delorian");lstItems.add("Mazda");lstItems.add("Mercedes");

   createListDialog(lstItems).show();
   }
   public AlertDialog createListDialog(List<String> lst){
   final List<String> lstItems = lst;

   ArrayAdapter<String> adapter =
   new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, lstItems);

   AlertDialog.Builder builder = new AlertDialog.Builder(this);
   builder.setTitle("Choose Car");
   builder.setCancelable(false);
   builder.setAdapter(adapter, new DialogInterface.OnClickListener() {
   @Override
   public void onClick(DialogInterface dialog, int index) {
   Toast.makeText(MainActivity.this, lstItems.get(index), Toast.LENGTH_LONG).show();
   }
   });

   return builder.create();
   }

   public void onCustomAlertDialog(View view) {
   LayoutInflater inflater = getLayoutInflater();
   View adView = inflater.inflate(R.layout.alertxml, null, false);
   final EditText txtCbUser = adView.findViewById(R.id.txtUser);
   final EditText txtCbPass = adView.findViewById(R.id.txtPass);
   CheckBox chkCbPass = adView.findViewById(R.id.chkPassword);

   chkCbPass.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
   @Override
   public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
   if(isChecked){
   txtCbPass.setTransformationMethod(HideReturnsTransformationMethod.getInstance());
   return;
   }
   txtCbPass.setTransformationMethod(PasswordTransformationMethod.getInstance());
   }
   });

   AlertDialog.Builder builder = new AlertDialog.Builder(this);

   builder.setTitle("Please Login.");

   builder.setCancelable(false);

   builder.setPositiveButton("Signup", new DialogInterface.OnClickListener() {
   @Override
   public void onClick(DialogInterface dialog, int which) {
   // todo : or not to do, that's the question
   }
   });

   builder.setNegativeButton("Login", new DialogInterface.OnClickListener() {
   @Override
   public void onClick(DialogInterface dialog, int which) {
   String cerd = "User: " + txtCbUser.getText().toString() +
   "Password: " + txtCbPass.getText().toString();
   Toast.makeText(MainActivity.this, cerd, Toast.LENGTH_LONG).show();
   dialog.dismiss();
   }
   });
   // setView(View); - custom xml View
   builder.setView(adView);

   AlertDialog dialog = builder.create();
   dialog.show();
   }
}

_________________
MB over and out _______________________

Posts : 286 Join date : 2011-08-02

android studio play mp3.

the following app plays pokemon from an online resource and digimon from
a digimon.mp3 (all chars must be lower case) from a file in the app.

on solution explorer window right click res folder, new, android resource directory
and add digimon.mp3.

main activity xml :

Code:: <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

<SeekBar
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_above="@id/controlsLayout"
android:layout_marginHorizontal="25dp"
android:id="@+id/seekBar"/>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:id="@+id/controlsLayout">
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btnStart"
android:src="@android:drawable/ic_media_play"
android:onClick="onStartMedia"/>
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btnPause"
android:src="@android:drawable/ic_media_pause"
android:onClick="onPauseMedia"/>
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btnStop"
android:src="@android:drawable/ic_media_previous"
android:onClick="onStopMedia"/>
</LinearLayout>
<Button
android:onClick="playDigimon"
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:text="Button"
android:layout_below="@id/controlsLayout"
/>

</RelativeLayout>

main activity java code :

Code:: package com.justforum.yotamarker.mp3project;

import android.media.MediaPlayer;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.SeekBar;

import java.io.IOException;

public class MainActivity extends AppCompatActivity {
MediaPlayer mediaPlayer;
SeekBar seekCbBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
seekCbBar = findViewById(R.id.seekBar);
// using local file:
// mediaPlayer = MediaPlayer.create(this, R.raw.pokemon);
//using HTTP:
mediaPlayer = new MediaPlayer();
try {
mediaPlayer.setDataSource("https://instrumentalfx.co/wp-content/upload/11/Pokemon-Theme-Song.mp3");
mediaPlayer.prepare();
}
catch (IOException e) {
e.printStackTrace();
}
//

mediaPlayer.setLooping(false);
seekCbBar.setMax(mediaPlayer.getDuration());

mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
mp.start();
}
});

attachSeekBarToMedia();
setSeekBarListener();
}

public void attachSeekBarToMedia(){
final Handler handler = new Handler();

MainActivity.this.runOnUiThread(new Runnable() {
@Override
public void run() {
seekCbBar.setProgress(mediaPlayer.getCurrentPosition());
handler.postDelayed(this, 1000);
}
});
}

public void setSeekBarListener(){
seekCbBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
if(fromUser){
mediaPlayer.seekTo(progress);
}
}

@Override
public void onStartTrackingTouch(SeekBar seekBar) {

}

@Override
public void onStopTrackingTouch(SeekBar seekBar) {

}
});
}

public void onStartMedia(View view) {
mediaPlayer.start();
}

public void onPauseMedia(View view) {
mediaPlayer.pause();
}

public void onStopMedia(View view) {
mediaPlayer.pause();
mediaPlayer.seekTo(0);
}

public void playDigimon(View view) {
mediaPlayer = MediaPlayer.create(this, R.raw.digimon);
mediaPlayer.setLooping(false);
mediaPlayer.start();
}
}

in the manifest folder in the AndroidManifest.xml add :

Code:: <uses-permission android:name="android.permission.INTERNET"/>
under
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="project name">

so it looks about like this :

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.justforum.yotamarker.mp3project">
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

</manifest>

the above manifest gives the app permission to DL files in this case pokemon mp3.

_________________
MB over and out _______________________

Posts : 286 Join date : 2011-08-02

android studio video view with landscap and portrait mode

place nebula.mp4 in raw folder in res folder in solution explorer window

main activity xml :

tongue

Code:: <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   tools:context=".MainActivity">

   <VideoView
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   android:id="@+id/videoView"
   />

</RelativeLayout>

main activity java :

Code:: package com.justforum.yotamarker.video;

import android.app.ActionBar;
import android.content.res.Configuration;
import android.net.Uri;
import android.os.Build;
import android.support.annotation.RequiresApi;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.MediaController;
import android.widget.RelativeLayout;
import android.widget.VideoView;

public class MainActivity extends AppCompatActivity {
   VideoView videoCbView;
   MediaController mediaController;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);
   videoCbView = findViewById(R.id.videoView);
   mediaController = new MediaController(this);
   videoCbView.setMediaController(mediaController);
   videoCbView.setVideoURI(Uri.parse("android.resource://" + getPackageName() + "/" + R.raw.nebula));
   videoCbView.requestFocus();
   videoCbView.start();

   }

   @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR1)
   public void changeOrientation(boolean landscape){
   if(landscape){
   RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) videoCbView.getLayoutParams();
   params.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
   params.addRule(RelativeLayout.ALIGN_PARENT_TOP);
   params.addRule(RelativeLayout.ALIGN_PARENT_LEFT);
   params.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
   videoCbView.setLayoutParams(params);
   return;
   }
   RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) videoCbView.getLayoutParams();
   params.removeRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
   params.removeRule(RelativeLayout.ALIGN_PARENT_TOP);
   params.removeRule(RelativeLayout.ALIGN_PARENT_LEFT);
   params.removeRule(RelativeLayout.ALIGN_PARENT_RIGHT);
   videoCbView.setLayoutParams(params);
   }

   @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR1)
   @Override
   public void onConfigurationChanged(Configuration newConfig) {
   super.onConfigurationChanged(newConfig);

   switch (newConfig.orientation){
   case Configuration.ORIENTATION_LANDSCAPE:
   changeOrientation(true);
   break;
   case Configuration.ORIENTATION_PORTRAIT:
   changeOrientation(false);
   break;
   }
   }
}

add android:configChanges="orientation to the manifest.xml in the manifest folder
so it looks like :

Code:: <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
   package="com.justforum.yotamarker.video">

   <application
   android:allowBackup="true"
   android:icon="@mipmap/ic_launcher"
   android:label="@string/app_name"
   android:roundIcon="@mipmap/ic_launcher_round"
   android:supportsRtl="true"
   android:theme="@style/AppTheme">
   <activity android:name=".MainActivity" android:configChanges="orientation">
   <intent-filter>
   <action android:name="android.intent.action.MAIN" />

   <category android:name="android.intent.category.LAUNCHER" />
   </intent-filter>
   </activity>
   </application>

</manifest>

_________________
MB over and out _______________________

Posts : 286 Join date : 2011-08-02

main activity xml :

Code:: <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter URL..."
android:maxLines="1"
android:id="@+id/txtUrl"
android:layout_toLeftOf="@id/btns"
android:layout_toStartOf="@id/btns" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:id="@+id/btns"
android:layout_alignParentEnd="true">
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btnGo"
android:src="@android:drawable/ic_media_play"
android:onClick="onLoadUrl"/>
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btnReload"
android:src="@android:drawable/ic_popup_sync"
android:onClick="onReload"/>
</LinearLayout>

<ProgressBar
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/progBar"
style="@android:style/Widget.Holo.ProgressBar.Horizontal"
android:layout_below="@id/btns"/>

<WebView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/webView"
android:layout_below="@id/progBar"/>

</RelativeLayout>

custom browser class to enable site blocking:

Code:: package com.hackeru.mysimplewebview;

import android.net.Uri;
import android.os.Build;
import android.support.annotation.RequiresApi;
import android.webkit.WebResourceRequest;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class CustomWVClient extends WebViewClient {

@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
@Override
public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) {

return request.getUrl().getHost().contains("ynet.co.il");
}

@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
return Uri.parse(url).getHost().contains("ynet.co.il");
}
}

main activity java :

Code:: package com.hackeru.mysimplewebview;

import android.content.Context;
import android.content.Intent;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.EditText;
import android.widget.ProgressBar;

public class MainActivity extends AppCompatActivity {

EditText txtCbUrl;
WebView webCbView;
ProgressBar progCbBar;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// assign reference to the local data members
txtCbUrl = findViewById(R.id.txtUrl);
webCbView = findViewById(R.id.webView);
progCbBar = findViewById(R.id.progBar);
progCbBar.setMax(100);
// get the WebView Settings instance
WebSettings settings = webCbView.getSettings();
// Enable JavaScript - to allow sites that depend on JS to load
// content
settings.setJavaScriptEnabled(true);

webCbView.setWebViewClient(new CustomWVClient());
webCbView.setWebChromeClient(new WebChromeClient());

}

public void onLoadUrl(View view) {
StringBuffer buffer = new StringBuffer(txtCbUrl.getText().toString());
if(!buffer.toString().startsWith("http://") || !buffer.toString().startsWith("https://")){
buffer.insert(0, "http://");
}

webCbView.loadUrl(buffer.toString());
InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
inputMethodManager.hideSoftInputFromWindow(view.getWindowToken(), 1234);
updateProgressBar();
}

public void onReload(View view) {
webCbView.reload();
updateProgressBar();
}

public void updateProgressBar(){
final Handler handler = new Handler();
MainActivity.this.runOnUiThread(new Runnable() {
@Override
public void run() {
progCbBar.setProgress(webCbView.getProgress());
if(webCbView.getProgress() < 100){
handler.postDelayed(this, 100);
}
}
});
}
}

add to the manifest xml in the manifest folder

<uses-permission android:name="android.permission.INTERNET"/>

so it looks like :

Code:: <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.hackeru.mysimplewebview">


<uses-permission android:name="android.permission.INTERNET"/>

<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

</manifest>

_________________
MB over and out _______________________

Posts : 286 Join date : 2011-08-02

android studio using fragments.
controlling views on fragments from other fragments.

to create a fragment right click the layout folder in the solution explorer, new, fragment.
this will add the fragment xml and java code.

fragment bg color xml :

Code:: <?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".BgColorFragment">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/xyz"
android:src="@drawable/ic_launcher_background"
/>

</FrameLayout>

bg color fragment java :

Code:: package com.justforum.yotamarker.fragment;

import android.content.Context;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;

public class BgColorFragment extends Fragment {

// this is a simple empty fragment without any controlls and attached to its xml file
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_bg_color, container, false);
// ImageView imageView = view.findViewById(R.id.xyz);
// imageView.setImageResource(R.drawable.ogre);
return view;
}

}

color list fragment xml :

Code:: <?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ColorListFragment"
>

<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/listColors"/>

</FrameLayout>

color list fragment java :

Code:: package com.justforum.yotamarker.fragment;

import android.content.Context;
import android.graphics.Color;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

// all fragment technigues here
public class ColorListFragment extends Fragment {
ListView listCbColors;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {

View view = inflater.inflate(R.layout.fragment_color_list, container, false);
// color list declared final because it uses a listener
final String[] colors = {"Red", "Green", "Blue", "Black", "White", "Gray", "Magenta", "Yellow",
"Light Gray", "Dark Gray", "Light Grey", "Dark Grey", "Olive",
"Teal", "Silver", "Purple", "Cyan", "Aqua", "Fuchsia", "Lime", "Maroon", "Navy"};

// on fragment controller
listCbColors = view.findViewById(R.id.listColors);
// list view adapter
ArrayAdapter<String> adapter =
new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, colors);
listCbColors.setAdapter(adapter);
// list view click event :
listCbColors.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// link to another fragment :
BgColorFragment bgColorFragment = (BgColorFragment) getFragmentManager().findFragmentById(R.id.bgColorFragments);
// set linked fragment bg attribute
setBgColor(bgColorFragment, colors[position].toLowerCase().replace(" ", ""));
// code block to add controller to fragment programmatically (text box):
FrameLayout frameLayout = bgColorFragment.getView().findViewById(R.id.bgColorFragments);
TextView lblColor = new TextView(bgColorFragment.getContext());
lblColor.setText(colors[position]);
lblColor.setTextSize(20);
// reset fragment to the way it is in its xml

frameLayout.removeAllViews();
frameLayout.addView(lblColor);
// manipulate a controller on the other fragment this does not work with the code line frameLayout.removeAllViews(); above
// which kills the image controller image view and all other views for that matter
// ImageView iv1 = (ImageView)bgColorFragment.getView().findViewById(R.id.xyz);
// iv1.setImageResource(R.drawable.ic_launcher_foreground);

}
});

return view;
}

public void setBgColor(Fragment fragment, String color){
fragment.getView().setBackgroundColor(Color.parseColor(color));
}

}

main activity xml :

Code:: <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

<fragment
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="0.5"
android:id="@+id/listColorFragments"
tools:layout="@layout/fragment_color_list"
android:name="com.justforum.yotamarker.fragment.ColorListFragment"/>
<fragment
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="0.5"
android:id="@+id/bgColorFragments"
tools:layout="@layout/fragment_bg_color"
android:name="com.justforum.yotamarker.fragment.BgColorFragment"/>

</LinearLayout>

main activity java (default):

Code:: package com.justforum.yotamarker.fragment;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ImageView;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}

notice the image view on bgcolor fragment is only for showing how to change its image from
the color list fragment

the code is commented out :
// manipulate a controller on the other fragment this does not work with the code line frameLayout.removeAllViews(); above
// which kills the image controller image view and all other views for that matter
// ImageView iv1 = (ImageView)bgColorFragment.getView().findViewById(R.id.xyz);
// iv1.setImageResource(R.drawable.ic_launcher_foreground);

if you comment it comment :
frameLayout.removeAllViews();
or it will glitch

_________________
MB over and out _______________________

Posts : 286 Join date : 2011-08-02

the android grimoir pager using app :

in gradle scripts, build.gradle(module: app)

add :
// Design Package for TabLayout And ViewPager
implementation 'com.android.support:design:27.1.1'

in dependencies (txt) above testImplementation. than clicked the popped up sync now.

now the project can use pagers

main activity layout :

Code:: <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

<android.support.design.widget.TabLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#ffba18"
android:id="@+id/tabLayout"/>

<android.support.v4.view.ViewPager
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@id/tabLayout"
android:id="@+id/viewPager"/>

</RelativeLayout>

right click layout folder in res folder in solution explorer : new, resource file.
name: fragment_layout
root element : relative layout

xml :

Code:: <?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent">
<WebView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/webView"/>

</FrameLayout>

in tool strib, build rebuild

right click java folder, new, java class
call it url1fragment :

Code:: import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class url1fragment extends Fragment {
WebView webCbView;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_layout, container, false);
webCbView = view.findViewById(R.id.webView);
webCbView.setWebViewClient(new WebViewClient());
WebSettings settings = webCbView.getSettings();
settings.setJavaScriptEnabled(true);
webCbView.loadUrl("https://yotamarker.forumotion.com/t155-android-mobile-app-dev-apk");
return view;
}
}

do the same with url2fragment, and url3fragment and change the url address to yout liking

main activity java :

Code:: package com.justforum.yotamarker.androidgrimoire;

import android.support.annotation.Nullable;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {
ViewPager viewCbPager;
TabLayout tabCbLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewCbPager = findViewById(R.id.viewPager);
tabCbLayout = findViewById(R.id.tabLayout);
tabCbLayout.setupWithViewPager(viewCbPager);
viewCbPager.setAdapter(new ViewPagerAdapter(getSupportFragmentManager()));
}

private class ViewPagerAdapter extends FragmentPagerAdapter{
String[] names = {"android grimoire", "java grimoire", "donate"};
public ViewPagerAdapter(FragmentManager fm) {
super(fm);
}

@Override
public Fragment getItem(int position) {
switch (names[position].toLowerCase()){
case "java grimoire":
return new url2fragment();
case "android grimoire":
return new url1fragment();
case "donate":
return new url3fragment();
default:
return null;
}
}

@Override
public int getCount() {
return names.length;
}

@Nullable
@Override
public CharSequence getPageTitle(int position) {
return names[position];
}
}
}

in manifests folder in the solution explorer in the AndroidManifest.xml
add internet browsing permission :
<uses-permission android:name="android.permission.INTERNET"/>

so the code looks like :

Code:: <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.justforum.yotamarker.androidgrimoire">
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

</manifest>

you can use in the url#fragment java class :
webCbView.setWebChromeClient(new WebChromeClient());
instead of :
webCbView.setWebViewClient(new WebViewClient());
to enable a variety of features such as using img hyperlinks in the urls used.

_________________
MB over and out _______________________

Posts : 286 Join date : 2011-08-02

android studio timer event repeated scheduled task

main activity xml :

Code:: <?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   tools:context=".MainActivity">

   <TextView
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="Hello World!"
   app:layout_constraintBottom_toBottomOf="parent"
   app:layout_constraintLeft_toLeftOf="parent"
   app:layout_constraintRight_toRightOf="parent"
   app:layout_constraintTop_toTopOf="parent"
   android:id="@+id/tv1"/>

</android.support.constraint.ConstraintLayout>

main activity java :

Code:: package com.justforum.yotamarker.timer1;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
   TextView tv1;
   int count = 0;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);
   tv1= findViewById(R.id.tv1);
   Thread t=new Thread(){
   @Override
   public void run(){
   while((!isInterrupted())){
   try {
   Thread.sleep(2000);

   runOnUiThread(new Runnable() {
   @Override
   public void run() {
   count++;
   tv1.setText(String.valueOf(count));

   }
   });
   } catch (InterruptedException e) {
   e.printStackTrace();
   }

   }
   }
   };
   t.start();
   }
}

_________________
MB over and out _______________________

Posts : 286 Join date : 2011-08-02

android studio walkthrough RecyclerView :
the same as customlist view but takes longer to set up and can handle heavier amounts
of elements, with x elements active at a given time.

setup support design libraries :
solution explorer, gradle scripts, build.gradle(module.app),
add in dependencies:
implementation 'com.android.support:appcompat-v7:27.1.1'
implementation 'com.android.support:design:27.1.1'

so it looks like :

Code:: apply plugin: 'com.android.application'

android {
   compileSdkVersion 27
   defaultConfig {
   applicationId "com.justforum.yotamarker.rycyclerview1"
   minSdkVersion 15
   targetSdkVersion 27
   versionCode 1
   versionName "1.0"
   testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
   }
   buildTypes {
   release {
   minifyEnabled false
   proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
   }
   }
}

dependencies {
   implementation fileTree(dir: 'libs', include: ['*.jar'])
   //noinspection GradleCompatible
   implementation 'com.android.support:appcompat-v7:27.1.1'
   implementation 'com.android.support:design:27.1.1'
   implementation 'com.android.support.constraint:constraint-layout:1.1.0'
   testImplementation 'junit:junit:4.12'
   androidTestImplementation 'com.android.support.test:runner:1.0.2'
   androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}

add a recycler view to
activity_main xml :

Code:: <?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   tools:context=".MainActivity">

   <android.support.v7.widget.RecyclerView
   android:id="@+id/recyclerView"
   android:scrollbars="vertical"
   android:layout_width="match_parent"
   android:layout_height="match_parent"/>

</android.support.constraint.ConstraintLayout>

in res, layout folder : right click, add new layout resource file :
file name: layout_recycler_view
root element : LinearLayout

xml (padding adds space between the recycle partinias elements) :

Code:: <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:orientation="vertical" android:layout_width="match_parent"
   android:padding="20dp"
   android:layout_height="wrap_content">

   <TextView
   android:id="@+id/txtDescription"
   android:text="Description"
   android:textColor="#000"
   android:layout_width="match_parent"
   android:layout_height="wrap_content"

   />

</LinearLayout>

in values, styles.xml set to :

Code:: <resources>

   
   <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
   
   <item name="colorPrimary">@color/colorPrimary</item>
   <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
   <item name="colorAccent">@color/colorAccent</item>
   </style>

</resources>

right click main.java, new, java class, kind : interface name : ItemClickListener

Code:: package com.justforum.yotamarker.rycyclerview1;

import android.view.View;

public interface ItemClickListener {
   void onClick(View view, int position, boolean isLongClick);
}

right click main.java, new, java class, RecyclerAdapter class :

package com.justforum.yotamarker.rycyclerview1;

import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

class RecyclerViewHandler extends RecyclerView.ViewHolder implements View.OnClickListener,View.OnLongClickListener{
   public TextView txt_description;
   private ItemClickListener itemClickListener;

   public RecyclerViewHandler(View itemView) {
   super(itemView);
   txt_description = (TextView)itemView.findViewById(R.id.txtDescription);
   itemView.setOnClickListener(this);
   itemView.setOnLongClickListener(this);
   }
   public void setItemClickListener(ItemClickListener itemClickListener)
   {
   this.itemClickListener = itemClickListener;

   }
   public void onClick(View v)
   {
   itemClickListener.onClick(v,getAdapterPosition(),false);
   }

   @Override
   public boolean onLongClick(View v) {
   itemClickListener.onClick(v,getAdapterPosition(),true);
   return true;
   }
}
public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerViewHandler>{
   private List<String> listData = new ArrayList<>();
   private Context context;

   public RecyclerAdapter(List<String> listData, Context context) {
   this.listData = listData;
   this.context = context;
   }

   @NonNull
   @Override
   public RecyclerViewHandler onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
   LayoutInflater inflater = LayoutInflater.from(parent.getContext());
   View itemView = inflater.inflate(R.layout.layout_item_recycler_view,parent,false);

   return new RecyclerViewHandler(itemView);
   }

   @Override
   public void onBindViewHolder(@NonNull RecyclerViewHandler holder, int position) {
   holder.txt_description.setText(listData.get(position));
   holder.setItemClickListener(new ItemClickListener() {
   @Override
   public void onClick(View view, int position, boolean isLongClick) {
   if(isLongClick)
   Toast.makeText(context, "long clicked " + listData.get(position), Toast.LENGTH_SHORT).show();
   else
   Toast.makeText(context, "short clicked " + listData.get(position), Toast.LENGTH_SHORT).show();

   }
   });

   }

   @Override
   public int getItemCount() {
   return listData.size();
   }
}

main activity code :

Code:: package com.justforum.yotamarker.rycyclerview1;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
RecyclerView recyclerView;
private RecyclerView.LayoutManager layoutManager;
private List<String> listData = new ArrayList<>();

   @Override
   protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);
   setupList();
   recyclerView = (RecyclerView)findViewById(R.id.recyclerView);
   recyclerView.setHasFixedSize(true);
   layoutManager = new LinearLayoutManager(this);
   recyclerView.setLayoutManager(layoutManager);
   RecyclerAdapter adapter = new RecyclerAdapter(listData,this);
   recyclerView.setAdapter(adapter);

   }

   private void setupList() {
   for(int i=1;i<=50;i++){
   listData.add("click me " + i);
   }
   }
}

adding animation to Recyle view : src https://proandroiddev.com/enter-animation-using-recyclerview-and-layoutanimation-part-1-list-75a874a5d213

add miku1- miku14 without miku named png images to the drawable folder

in res add anim directory, add to it :

item_animation_fall_down.xml :

Code:: <set xmlns:android="http://schemas.android.com/apk/res/android"

   android:duration="2000">

   <translate

   android:fromYDelta="-20%"

   android:toYDelta="0"

   android:interpolator="@android:anim/decelerate_interpolator"

   />

   <alpha

   android:fromAlpha="0"

   android:toAlpha="1"

   android:interpolator="@android:anim/decelerate_interpolator"

   />

   <scale

   android:fromXScale="105%"

   android:fromYScale="105%"

   android:toXScale="100%"

   android:toYScale="100%"

   android:pivotX="50%"

   android:pivotY="50%"

   android:interpolator="@android:anim/decelerate_interpolator"

   />

</set>

android:duration="2000" is how long the animation runs

and layout_animation_fall_down.xml :

Code:: <?xml version="1.0" encoding="utf-8"?>

<layoutAnimation

   xmlns:android="http://schemas.android.com/apk/res/android"

   android:animation="@anim/item_animation_fall_down"

   android:delay="15%"

   android:animationOrder="normal"

   />

add a simple book java class with image int :

Code:: package com.justforum.yotamarker.rycyclerview1;

import android.support.annotation.DrawableRes;

public class books {
   private @DrawableRes
   int picture;
   private String name;

   public books(@DrawableRes int picture, String name) {
   this.picture = picture;
   this.name = name;
   }

   public @DrawableRes int getPicture() {
   return picture;
   }

   public String getName() {
   return name;
   }

   public void setPicture(@DrawableRes int picture) {
   this.picture = picture;
   }

   public void setName(String name) {
   this.name = name;
   }
}

add a button to main activity xml which will rerun the animation :

Code:: <?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   tools:context=".MainActivity">
   <Button
   android:onClick="TestHelloWorld"
   android:id="@+id/button"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"

   android:layout_centerVertical="true"
   android:layout_marginStart="63dp"
   android:text="Button" />
   <android.support.v7.widget.RecyclerView
   android:id="@+id/recyclerView"
   android:scrollbars="vertical"

   android:layout_width="match_parent"
   android:layout_height="match_parent"/>

</android.support.constraint.ConstraintLayout>

change the RecyclerAdapter java class to be compatible with the book class :

Code:: package com.justforum.yotamarker.rycyclerview1;

import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

class RecyclerViewHandler extends RecyclerView.ViewHolder implements View.OnClickListener,View.OnLongClickListener{
   public TextView txt_description;
   public ImageView pic;
   private ItemClickListener itemClickListener;

   public RecyclerViewHandler(View itemView) {
   super(itemView);
   txt_description = (TextView)itemView.findViewById(R.id.txtDescription);
   pic = (ImageView)itemView.findViewById(R.id.imgContact);
   itemView.setOnClickListener(this);
   itemView.setOnLongClickListener(this);
   }
   public void setItemClickListener(ItemClickListener itemClickListener)
   {
   this.itemClickListener = itemClickListener;

   }
   public void onClick(View v)
   {
   itemClickListener.onClick(v,getAdapterPosition(),false);
   }

   @Override
   public boolean onLongClick(View v) {
   itemClickListener.onClick(v,getAdapterPosition(),true);
   return true;
   }
}
public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerViewHandler>{
   private List<books> bookList = new ArrayList<>();
   private Context context;

   public RecyclerAdapter(List<books> bookList, Context context) {
   this.bookList = bookList;
   this.context = context;
   }

   @NonNull
   @Override
   public RecyclerViewHandler onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
   LayoutInflater inflater = LayoutInflater.from(parent.getContext());
   View itemView = inflater.inflate(R.layout.layout_item_recycler_view,parent,false);

   return new RecyclerViewHandler(itemView);
   }

   @Override
   public void onBindViewHolder(@NonNull RecyclerViewHandler holder, int position) {
   holder.txt_description.setText(bookList.get(position).getName());
   holder.pic.setImageResource(bookList.get(position).getPicture());
   holder.setItemClickListener(new ItemClickListener() {
   @Override
   public void onClick(View view, int position, boolean isLongClick) {
   if(isLongClick)
   Toast.makeText(context, "long clicked " + bookList.get(position).getName(), Toast.LENGTH_SHORT).show();
   else
   Toast.makeText(context, "short clicked " + bookList.get(position).getName(), Toast.LENGTH_SHORT).show();

   }
   });

   }

   @Override
   public int getItemCount() {
   return bookList.size();
   }
}

modify the main activity java code :

Code:: package com.justforum.yotamarker.rycyclerview1;

import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.animation.AnimationUtils;
import android.view.animation.LayoutAnimationController;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
RecyclerView recyclerView;
private RecyclerView.LayoutManager layoutManager;
private List<books> bookList = new ArrayList<>();
   int resId = R.anim.layout_animation_fall_down;

   @Override
   protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);

   setContentView(R.layout.activity_main);
   setupList();
   recyclerView = (RecyclerView)findViewById(R.id.recyclerView);
   recyclerView.setHasFixedSize(true);
   layoutManager = new LinearLayoutManager(this);
   recyclerView.setLayoutManager(layoutManager);
   RecyclerAdapter adapter = new RecyclerAdapter(bookList,this);
   recyclerView.setAdapter(adapter);

   LayoutAnimationController animation = AnimationUtils.loadLayoutAnimation(this, resId);

   recyclerView.setLayoutAnimation(animation);

   }

   private void setupList() {
   int[] thisIsAnIntrray = {R.drawable.miku1,R.drawable.miku2,R.drawable.miku3,R.drawable.miku4,
   R.drawable.miku5,R.drawable.miku6,R.drawable.miku7,R.drawable.miku8,R.drawable.miku9,
   R.drawable.miku10,R.drawable.miku11,R.drawable.miku13,R.drawable.miku14};
   for(int i=0;i<13;i++){
   bookList.add(new books((thisIsAnIntrray[i]), "book " + i));
   }
   }
   private void runLayoutAnimation(final RecyclerView recyclerView) {
   final Context context = recyclerView.getContext();
   final LayoutAnimationController controller =
   AnimationUtils.loadLayoutAnimation(context, R.anim.layout_animation_fall_down);

   recyclerView.setLayoutAnimation(controller);
   recyclerView.getAdapter().notifyDataSetChanged();
   recyclerView.scheduleLayoutAnimation();
   }

   public void TestHelloWorld(View view) {
   runLayoutAnimation(recyclerView);
   }
}

also you can bind the animation to the xml recycler widget like this :

Code:: <android.support.v7.widget.RecyclerView

   android:layout_width="match_parent"

   android:layout_height="match_parent"

   android:layoutAnimation="@anim/layout_animation_fall_down"

   />

instead of how it is in the main activity on create.

alternate equivilant faster walkthrough :

add : implementation 'com.android.support:recyclerview-v7:27.1.1'
to build.gradle(module:app)

add miku#.png : # = 1 to 14 without 12

to res layout :
activity_main :

Code:: <?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   tools:context=".MainActivity">
   <Button
   android:onClick="TestHelloWorld"
   android:id="@+id/button"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"

   android:layout_centerVertical="true"
   android:layout_marginStart="63dp"
   android:text="Button" />
   <android.support.v7.widget.RecyclerView
   android:id="@+id/recyclerView"
   android:scrollbars="vertical"

   android:layout_width="match_parent"
   android:layout_height="match_parent"/>

</android.support.constraint.ConstraintLayout>

and layout_item_recycler_view.xml :

Code:: <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:orientation="vertical" android:layout_width="match_parent"
   android:padding="20dp"
   android:layout_height="wrap_content">
   <ImageView
   android:layout_width="45dp"
   android:layout_height="45dp"
   android:id="@+id/imgContact"
   android:src="@mipmap/ic_launcher"
   android:layout_margin="5dp"/>
   <TextView
   android:id="@+id/txtDescription"
   android:text="Description"
   android:textColor="#000"
   android:layout_width="match_parent"
   android:layout_height="wrap_content"

   />

</LinearLayout>

creat folder anim in res :
add :
item_animation_fall_down.xml :

Code:: <set xmlns:android="http://schemas.android.com/apk/res/android"

android:duration="2000">

<translate

android:fromYDelta="-20%"

android:toYDelta="0"

android:interpolator="@android:anim/decelerate_interpolator"

/>

<alpha

android:fromAlpha="0"

android:toAlpha="1"

android:interpolator="@android:anim/decelerate_interpolator"

/>

<scale

android:fromXScale="105%"

android:fromYScale="105%"

android:toXScale="100%"

android:toYScale="100%"

android:pivotX="50%"

android:pivotY="50%"

android:interpolator="@android:anim/decelerate_interpolator"

/>

</set>

and in that same anime folder add layout_animation_fall_down.xml :

Code:: <?xml version="1.0" encoding="utf-8"?>

<layoutAnimation

   xmlns:android="http://schemas.android.com/apk/res/android"

   android:animation="@anim/item_animation_fall_down"

   android:delay="15%"

   android:animationOrder="normal"

   />

add books.java :

Code:: package com.justforum.yotamarker.rycyclerview1;

import android.support.annotation.DrawableRes;

public class books {
   private @DrawableRes
   int picture;
   private String name;

   public books(@DrawableRes int picture, String name) {
   this.picture = picture;
   this.name = name;
   }

   public @DrawableRes int getPicture() {
   return picture;
   }

   public String getName() {
   return name;
   }

   public void setPicture(@DrawableRes int picture) {
   this.picture = picture;
   }

   public void setName(String name) {
   this.name = name;
   }
}

ItemClickListener (interface)

Code:: package com.justforum.yotamarker.rycyclerview1;

import android.view.View;

public interface ItemClickListener {
void onClick(View view, int position, boolean isLongClick);
}

RecyclerAdapter java :

Code:: package com.justforum.yotamarker.rycyclerview1;

import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

class RecyclerViewHandler extends RecyclerView.ViewHolder implements View.OnClickListener,View.OnLongClickListener{
   public TextView txt_description;
   public ImageView pic;
   private ItemClickListener itemClickListener;

   public RecyclerViewHandler(View itemView) {
   super(itemView);
   txt_description = (TextView)itemView.findViewById(R.id.txtDescription);
   pic = (ImageView)itemView.findViewById(R.id.imgContact);
   itemView.setOnClickListener(this);
   itemView.setOnLongClickListener(this);
   }
   public void setItemClickListener(ItemClickListener itemClickListener)
   {
   this.itemClickListener = itemClickListener;

   }
   public void onClick(View v)
   {
   itemClickListener.onClick(v,getAdapterPosition(),false);
   }

   @Override
   public boolean onLongClick(View v) {
   itemClickListener.onClick(v,getAdapterPosition(),true);
   return true;
   }
}
public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerViewHandler>{
   private List<books> bookList = new ArrayList<>();
   private Context context;

   public RecyclerAdapter(List<books> bookList, Context context) {
   this.bookList = bookList;
   this.context = context;
   }

   @NonNull
   @Override
   public RecyclerViewHandler onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
   LayoutInflater inflater = LayoutInflater.from(parent.getContext());
   View itemView = inflater.inflate(R.layout.layout_item_recycler_view,parent,false);

   return new RecyclerViewHandler(itemView);
   }

   @Override
   public void onBindViewHolder(@NonNull RecyclerViewHandler holder, int position) {
   holder.txt_description.setText(bookList.get(position).getName());
   holder.pic.setImageResource(bookList.get(position).getPicture());
   holder.setItemClickListener(new ItemClickListener() {
   @Override
   public void onClick(View view, int position, boolean isLongClick) {
   if(isLongClick)
   Toast.makeText(context, "long clicked " + bookList.get(position).getName(), Toast.LENGTH_SHORT).show();
   else
   Toast.makeText(context, "short clicked " + bookList.get(position).getName(), Toast.LENGTH_SHORT).show();

   }
   });

   }

   @Override
   public int getItemCount() {
   return bookList.size();
   }
}

MainActivity.java :

Code:: package com.justforum.yotamarker.recycler2;

import android.content.Context;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.animation.AnimationUtils;
import android.view.animation.LayoutAnimationController;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
RecyclerView recyclerView;
private RecyclerView.LayoutManager layoutManager;
private List<books> bookList = new ArrayList<>();
   int resId = R.anim.layout_animation_fall_down;

   @Override
   protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);

   setContentView(R.layout.activity_main);
   setupList();
   recyclerView = (RecyclerView)findViewById(R.id.recyclerView);
   recyclerView.setHasFixedSize(true);
   layoutManager = new LinearLayoutManager(this);
   recyclerView.setLayoutManager(layoutManager);
   RecyclerAdapter adapter = new RecyclerAdapter(bookList,this);
   recyclerView.setAdapter(adapter);

   LayoutAnimationController animation = AnimationUtils.loadLayoutAnimation(this, resId);

   recyclerView.setLayoutAnimation(animation);

   }

   private void setupList() {
   int[] thisIsAnIntrray = {R.drawable.miku1,R.drawable.miku2,R.drawable.miku3,R.drawable.miku4,
   R.drawable.miku5,R.drawable.miku6,R.drawable.miku7,R.drawable.miku8,R.drawable.miku9,
   R.drawable.miku10,R.drawable.miku11,R.drawable.miku13,R.drawable.miku14};
   for(int i=0;i<13;i++){
   bookList.add(new books((thisIsAnIntrray[i]), "book " + i));
   }
   }
   private void runLayoutAnimation(final RecyclerView recyclerView) {
   final Context context = recyclerView.getContext();
   final LayoutAnimationController controller =
   AnimationUtils.loadLayoutAnimation(context, R.anim.layout_animation_fall_down);

   recyclerView.setLayoutAnimation(controller);
   recyclerView.getAdapter().notifyDataSetChanged();
   recyclerView.scheduleLayoutAnimation();
   }

   public void TestHelloWorld(View view) {
   runLayoutAnimation(recyclerView);
   }
}

download the projects folder to open ready made in android studio (extract zip download, from android studio tool bar, file, open, choose extracted folder):
https://k2s.cc/file/6d5cda369a031/recycler2.rar

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Posts : 286 Join date : 2011-08-02

explination in javadoc in code

main activity xml :

Code:: <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical"
android:padding="16dp"
tools:context="com.justforum.yotamarker.forresult.MainActivity">

<EditText
android:id="@+id/edit_text_number1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Number 1"
android:inputType="number" />

<EditText
android:id="@+id/edit_text_number2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Number 2"
android:inputType="number" />

<TextView
android:id="@+id/text_view_result"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Result"
android:textSize="30sp" />

<Button
android:id="@+id/button_open_activity2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="open activity 2" />

</LinearLayout>

activity 2 xml:

Code:: <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical"
android:padding="16dp"
tools:context="com.justforum.yotamarker.forresult.Activity2">

<TextView
android:id="@+id/text_view_numbers"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Numbers: "
android:textSize="30sp" />

<Button
android:id="@+id/button_add"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="add" />

<Button
android:id="@+id/button_subtract"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="subtract" />

</LinearLayout>

main java code :

Code:: package com.justforum.yotamarker.forresult;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
private TextView mTextViewResult;
private EditText mEditTextNumber1;
private EditText mEditTextNumber2;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main); // ties this java class to activity_main.xml (the design)
setTitle("shouryuken"); // set activity title
mTextViewResult = findViewById(R.id.text_view_result);
mEditTextNumber1 = findViewById(R.id.edit_text_number1);
mEditTextNumber2 = findViewById(R.id.edit_text_number2);

Button buttonOpenActivity2 = findViewById(R.id.button_open_activity2);
buttonOpenActivity2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mEditTextNumber1.getText().toString().equals("")
|| mEditTextNumber2.getText().toString().equals("")) {
Toast.makeText(MainActivity.this, "Please insert numbers", Toast.LENGTH_SHORT).show();
} else {

int number1 = Integer.parseInt(mEditTextNumber1.getText().toString());
int number2 = Integer.parseInt(mEditTextNumber2.getText().toString());

Intent intent = new Intent(MainActivity.this, Activity2.class);
intent.putExtra("number1", number1);
intent.putExtra("number2", number2);
startActivityForResult(intent, 1);
}
}
});
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
/* async methode runs while result activity runs
* and comes to this methode when summoned activity dies
* so it can summon several result activities while running
*/
super.onActivityResult(requestCode, resultCode, data);

if (requestCode == 1) {
if (resultCode == RESULT_OK) {
int result = data.getIntExtra("result", 0);
mTextViewResult.setText("" + result);
}
if (resultCode == RESULT_CANCELED) {
mTextViewResult.setText("Nothing selected");
}
}
}
}

activity 2 java code

Code:: package com.justforum.yotamarker.forresult;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class Activity2 extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_2);
// set activity title
setTitle("Activity 2 hadouken");

Intent intent = getIntent();
final int number1 = intent.getIntExtra("number1", 0);
final int number2 = intent.getIntExtra("number2", 0);

TextView textViewNumbers = findViewById(R.id.text_view_numbers);
textViewNumbers.setText("Numbers: " + number1 + ", " + number2);

Button buttonAdd = findViewById(R.id.button_add);
Button buttonSubtract = findViewById(R.id.button_subtract);

buttonAdd.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int result = number1 + number2;

Intent resultIntent = new Intent();
resultIntent.putExtra("result", result);

setResult(RESULT_OK, resultIntent);
finish(); // kill this activity
}
});

buttonSubtract.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int result = number1 - number2;

Intent resultIntent = new Intent();
resultIntent.putExtra("result", result);

setResult(RESULT_OK, resultIntent);
finish(); // kill this activity
}
});
}
}

_________________
MB over and out _______________________

Posts : 286 Join date : 2011-08-02

android splash screen, the screen thats loads for x milisec B4 the app loads

.1 solution explor, gradle scripts, build.gradle (modules: app), add line :
implementation 'gr.pantrif:easy-android-splash-screen:0.0.1'

above the line :
testImplementation 'junit:junit:4.12'

in dependencies block.

.2 : java folder, right click MainActivity, new, activity, empty activity
activity name : SplashScreen, uncheck generate layout file.

code :

Code:: package com.justforum.yotamarker.splash;

import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;

import gr.net.maroulis.library.EasySplashScreen;

public class SplashScreen extends AppCompatActivity {

   @Override
   protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);

   EasySplashScreen config = new EasySplashScreen(SplashScreen.this)
   .withFullScreen()
   .withTargetActivity(MainActivity.class)
   .withSplashTimeOut(5000)
   .withBackgroundColor(Color.parseColor("#1a1b29"))
   .withHeaderText("Header")
   .withFooterText("Footer")
   .withBeforeLogoText("Before Logo Text")
   .withAfterLogoText("After Logo Text")
   .withLogo(R.mipmap.ic_launcher_round);
   config.withBackgroundResource(R.drawable.splash);
   config.getHeaderTextView().setTextColor(Color.WHITE);
   config.getFooterTextView().setTextColor(Color.WHITE);
   config.getBeforeLogoTextView().setTextColor(Color.WHITE);
   config.getAfterLogoTextView().setTextColor(Color.WHITE);

   View easySplashScreen = config.create();
   setContentView(easySplashScreen);
   }
}

comment out config.withBackgroundResource(R.drawable.splash); if you dont put a background image in res, drawable
(splash.jpg)

.3 solution explorer window, manifests, AndroidManifest.xml flip between mainactivity and splashscreen so it looks like this :

Code:: <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
   package="com.justforum.yotamarker.splash">

   <application
   android:allowBackup="true"
   android:icon="@mipmap/ic_launcher"
   android:label="@string/app_name"
   android:roundIcon="@mipmap/ic_launcher_round"
   android:supportsRtl="true"
   android:theme="@style/AppTheme">
   <activity android:name=".SplashScreen">
   <intent-filter>
   <action android:name="android.intent.action.MAIN" />

   <category android:name="android.intent.category.LAUNCHER" />
   </intent-filter>
   </activity>
   <activity android:name=".MainActivity"></activity>
   </application>

</manifest>

remove the action bar to get full screen splash :
res folder, values, styles.xml
change : <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar"> to
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">

you can paste an action bar on the activity xml

_________________
MB over and out _______________________

Posts : 286 Join date : 2011-08-02

interfacing a fragement and setting a selected fragment into a layout view on some xml.

main xml :

Code:: <?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">


<RelativeLayout
android:layout_width="match_parent"
android:layout_height="300dp"
android:layout_marginTop="40dp"
android:id="@+id/mainContainer">

</RelativeLayout>

<TextView android:text="Fragment Comm"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/lblTitle"
android:gravity="center"
android:textColor="#4ada2a"
android:textAppearance="?android:textAppearanceLarge"
/>

<RelativeLayout
android:layout_width="match_parent"
android:layout_height="300dp"
android:layout_marginTop="40dp"
android:id="@+id/frgContainer"
>

</RelativeLayout>

</android.support.constraint.ConstraintLayout>

right click somewhere in the res, layout folder, new, fragment, fragment blank, change the xml to :

Code:: <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Select a color:"
android:layout_gravity="center"
/>
<RadioGroup
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_marginLeft="120dp"
android:layout_marginTop="130dp"
android:id="@+id/chkGrpBtns"
>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/chkRed"
android:text="Red"/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/chkGreen"
android:text="Green"/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/chkBlue"
android:text="Blue"/>

</RadioGroup>

</LinearLayout>

main java :

Code:: package com.justforum.yotamarker.kakerainterface;

import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.RelativeLayout;
// arm your activity with the fragment interface you made (implement):
public class MainActivity extends AppCompatActivity
implements ColorFragment.IColorChange{
RelativeLayout relativeLayoutCbObj;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// set xml UI for activity
setContentView(R.layout.activity_main);
// connect the layout to house the custom dynamic fragment
relativeLayoutCbObj = (RelativeLayout)findViewById
(R.id.mainContainer);
// use the frag manager to lload a fragement
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction =
fragmentManager.beginTransaction();

ColorFragment colorFragmentObj = new ColorFragment();
fragmentTransaction.add(R.id.frgContainer, colorFragmentObj);
fragmentTransaction.commit();
// remove fragment : fragmentTransaction.remove(colorFragmentObj);
// load different fragment : fragmentTransaction.replace(R.id.frgContainer, colorFragmentObj);
// then fragmentTransaction.commit();

}

@Override
public void colorChanged(String str) {
// implement your fragment interface
if(str.equals("Red"))
{
relativeLayoutCbObj.setBackgroundColor(Color.RED);
}else if(str.equals("Green"))
{
relativeLayoutCbObj.setBackgroundColor(Color.GREEN);
}
else if(str.equals("Blue"))
{
relativeLayoutCbObj.setBackgroundColor(Color.BLUE);
}

}
}

exampled fragment java :

Code:: package com.justforum.yotamarker.kakerainterface;

import android.app.Fragment;
import android.content.Context;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.RadioGroup;

public class ColorFragment extends Fragment {
RadioGroup grpCbObj;
IColorChange iColorChange;

@Nullable
@Override

public View onCreateView(LayoutInflater inflater,
ViewGroup container, Bundle
savedInstanceState) {
// add fragment view listeners here :
View view = inflater.inflate(R.layout.fragment_color,
container, false);
grpCbObj = (RadioGroup)view.findViewById(R.id.chkGrpBtns);

grpCbObj.setOnCheckedChangeListener
(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group,
int checkedId) {
switch (checkedId){
case R.id.chkRed:
iColorChange.colorChanged("Red");
break;
case R.id.chkGreen:
iColorChange.colorChanged("Green");
break;
case R.id.chkBlue:
iColorChange.colorChanged("Blue");
break;
}
}
});
return view;
}

@Override
public void onAttach(Context context) {
// on attach fragement event :
super.onAttach(context);
try
{
iColorChange = (IColorChange)context;
}
catch (Exception ex)
{
ex.printStackTrace();
}
}
// create the custom jutsu for the fragement using an interface
public interface IColorChange
{
void colorChanged(String str);
}
}

_________________
MB over and out _______________________

Posts : 286 Join date : 2011-08-02

android storing data lv1 :

shared preferences not deprecated (works on new APIs).

use a shared preferences screen to save simple values into the phone's cache memory such as simple
settings and strings :

add array.xml to res, values :
this is for simple dictionary data the preference screen will use among other widgets.

Code:: <resources>
<string-array name="listArray">
<item>Ace</item>
<item>Club</item>
</string-array>

<string-array name="listValues">
<item>Ace</item>
<item>Club</item>
</string-array>
</resources>

add xml dir to res, in it put preferences.xml (right click folder, new, xml resource file) :

Code:: <?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<EditTextPreference android:title="Your Name"
android:key="username"
android:summary="Please provide your username"></EditTextPreference>
<CheckBoxPreference android:title="Application Updates"
android:defaultValue="false"
android:summary="This option if selected will allow the application to check for latest versions."
android:key="applicationUpdates" />
<ListPreference android:title="Download Details"
android:summary="Select the kind of data that you would like to download"
android:key="downloadType"
android:defaultValue="Ace"
android:entries="@array/listArray"
android:entryValues="@array/listValues" />
</PreferenceScreen>

add empty activity : AppPreferenceActivity to java,com.projectdomain by right click new on the mainactivity :

Code:: package com.justforum.yotamarker.pref2;

import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceActivity;
import android.preference.PreferenceFragment;
import android.preference.PreferenceManager;
import android.widget.Toast;

public class AppPreferenceActivity extends PreferenceActivity
{
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
getFragmentManager().beginTransaction().replace(android.R.id.content, new MyPreferenceFragment()).commit();

checkValues();
}

public static class MyPreferenceFragment extends PreferenceFragment
{
@Override
public void onCreate(final Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
}
}

private void checkValues()
{
SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
String strUserName = sharedPrefs.getString("username", "NA");
boolean bAppUpdates = sharedPrefs.getBoolean("applicationUpdates",false);
String downloadType = sharedPrefs.getString("downloadType","1");

String msg = "Cur Values: ";
msg += "\n userName = " + strUserName;
msg += "\n bAppUpdates = " + bAppUpdates;
msg += "\n downloadType = " + downloadType;
// display vars from the shared pref widgets represented by the var msg :
Toast.makeText(getApplicationContext(),msg,Toast.LENGTH_LONG).show();
}
}

main activity with a btn to summon the preference screen as an activity :

Code:: <?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:onClick="TestHelloWorld"
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_centerVertical="true"
android:layout_marginStart="63dp"
android:text="Button" />

</android.support.constraint.ConstraintLayout>

main java :

Code:: package com.justforum.yotamarker.pref2;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

}

public void test(View view) {
Intent intent = new Intent(MainActivity.this, AppPreferenceActivity.class);
startActivity(intent);
}

public void TestHelloWorld(View view) {
Intent intent = new Intent(MainActivity.this, AppPreferenceActivity.class);
startActivity(intent);
}
}

lv1.

_________________
MB over and out _______________________

Posts : 286 Join date : 2011-08-02

save and read to phone cache as dictionary values for primitive vars (strings) :

main xml :

Code:: <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">


<EditText
android:id="@+id/txtText1"
android:layout_width="278dp"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_marginTop="37dp"
android:layout_toEndOf="@+id/btnSave"
android:ems="10">

<requestFocus />

</EditText>

<EditText
android:id="@+id/txtText2"
android:layout_width="276dp"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignStart="@+id/txtText1"
android:layout_marginTop="122dp" />

<TextView
android:id="@+id/lblFileName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignTop="@+id/txtText1"
android:text="File name: " />

<TextView
android:id="@+id/lblData"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignTop="@+id/txtText2"
android:text="Data: " />

<Button
android:id="@+id/btnSave"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/btnRead"
android:text="Save" />

<Button
android:id="@+id/btnRead"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_marginStart="105dp"
android:layout_marginTop="188dp"
android:text="Read" />

</RelativeLayout>

main java :

Code:: package com.justforum.yotamarker.iternalstorage;

import android.content.Context;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.StringReader;

public class MainActivity extends AppCompatActivity {

EditText editTextCb1, editTextCb2;
Button buttonCbSave, buttonCbRead;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

editTextCb1 = (EditText)findViewById(R.id.txtText1);
editTextCb2 = (EditText)findViewById(R.id.txtText2);
buttonCbSave = (Button)findViewById(R.id.btnSave);
buttonCbRead = (Button)findViewById(R.id.btnRead);

buttonCbSave.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String fileName = editTextCb1.getText().toString();
String data = editTextCb2.getText().toString();

// calling FileOutputStream
FileOutputStream fos;
try
{
fos = openFileOutput(fileName, Context.MODE_PRIVATE);
// Context.MODE_PRIVATE IS DEFAULT
fos.write(data.getBytes());
fos.close();
editTextCb2.setText("");
Toast.makeText(getApplicationContext(), fileName + "Saved " ,
Toast.LENGTH_SHORT).show();
}
catch (FileNotFoundException e)
{
e.printStackTrace();
}
catch (IOException e){
e.printStackTrace();
}

}
});

// Preform read FileInputStream
buttonCbRead.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String fileName = editTextCb1.getText().toString();
StringBuffer stringBuffer = new StringBuffer();
try
{
BufferedReader inputReader =
new BufferedReader(new
InputStreamReader(openFileInput(fileName)));
String inputString;
while((inputString = inputReader.readLine())!= null) {
stringBuffer.append(inputString);
}
}
catch (IOException e){
e.printStackTrace();
}
Toast.makeText(getApplicationContext(), stringBuffer.toString(),
Toast.LENGTH_SHORT).show();
}
});

}
}

_________________
MB over and out _______________________

Posts : 286 Join date : 2011-08-02

I twicked the code in here : https://www.journaldev.com/9400/android-external-storage-read-write-save-file
so that the data is stored as a dictionary :
key (String): myInputText2 (lower one on the UI)
value (String): myInputText (upper one)

activity main XML :

Code:: <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent" android:layout_height="fill_parent"
android:orientation="vertical">

<TextView android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Reading and Writing to External Storage"
android:textSize="24sp"/>

<EditText android:id="@+id/myInputText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10" android:lines="5"
android:minLines="3" android:gravity="top|left"
android:inputType="textMultiLine">

<requestFocus />
</EditText>

<EditText android:id="@+id/myInputText2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10" android:lines="5"
android:minLines="3" android:gravity="top|left"
android:inputType="textMultiLine"></EditText>

<LinearLayout
android:layout_width="match_parent" android:layout_height="wrap_content"
android:orientation="horizontal"
android:weightSum="1.0"
android:layout_marginTop="20dp">

<Button android:id="@+id/saveExternalStorage"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="SAVE"
android:layout_weight="0.5"/>

<Button android:id="@+id/getExternalStorage"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.5"
android:text="READ" />

</LinearLayout>

<TextView android:id="@+id/response"
android:layout_width="wrap_content"
android:layout_height="wrap_content" android:padding="5dp"
android:text=""
android:textAppearance="?android:attr/textAppearanceMedium" />

</LinearLayout>

main java :

Code:: import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import android.os.Bundle;
import android.app.Activity;
import android.os.Environment;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends Activity {
   EditText inputText, path;
   TextView response;
   Button saveButton,readButton;

   private String filename = "SampleFile.txt";
   private String filepath = "MyFileStorage2";
   File myExternalFile;
   String myData = "";

   @Override
   protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);

   inputText = (EditText) findViewById(R.id.myInputText);
   response = (TextView) findViewById(R.id.response);
   path = (EditText) findViewById(R.id.myInputText2);

   saveButton =
   (Button) findViewById(R.id.saveExternalStorage);
   saveButton.setOnClickListener(new OnClickListener() {
   @Override
   public void onClick(View v) {
   try {
   filename = path.getText().toString();
   myExternalFile = new File(getExternalFilesDir(filepath), filename);
   FileOutputStream fos = new FileOutputStream(myExternalFile);
   fos.write(inputText.getText().toString().getBytes());
   fos.close();
   } catch (IOException e) {
   e.printStackTrace();
   }
   inputText.setText("");
   response.setText("SampleFile.txt saved to External Storage...");
   }
   });

   readButton = (Button) findViewById(R.id.getExternalStorage);
   readButton.setOnClickListener(new OnClickListener() {
   @Override
   public void onClick(View v) {
   try {
   filename = path.getText().toString();
   myExternalFile = new File(getExternalFilesDir(filepath), filename);
   FileInputStream fis = new FileInputStream(myExternalFile);
   DataInputStream in = new DataInputStream(fis);
   BufferedReader br =
   new BufferedReader(new InputStreamReader(in));
   String strLine;
   while ((strLine = br.readLine()) != null) {
   myData = myData + strLine;
   }
   in.close();
   } catch (IOException e) {
   e.printStackTrace();
   }
   inputText.setText(myData);
   response.setText("SampleFile.txt data retrieved from external Storage...");
   myData = "";
   }
   });

   if (!isExternalStorageAvailable() || isExternalStorageReadOnly()) {
   saveButton.setEnabled(false);
   }
   else {
   myExternalFile = new File(getExternalFilesDir(filepath), filename);
   }

   }
   private static boolean isExternalStorageReadOnly() {
   String extStorageState = Environment.getExternalStorageState();
   if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(extStorageState)) {
   return true;
   }
   return false;
   }

   private static boolean isExternalStorageAvailable() {
   String extStorageState = Environment.getExternalStorageState();
   if (Environment.MEDIA_MOUNTED.equals(extStorageState)) {
   return true;
   }
   return false;
   }

}

manifest :

add :
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
above :
<application

so it looks like :

Code:: <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
   package="com.projectnamedomain">

   <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

   <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
   <application
   android:allowBackup="true"
   android:icon="@mipmap/ic_launcher"
   android:label="@string/app_name"
   android:roundIcon="@mipmap/ic_launcher_round"
   android:supportsRtl="true"
   android:theme="@style/AppTheme">
   <activity android:name=".MainActivity">
   <intent-filter>
   <action android:name="android.intent.action.MAIN" />

   <category android:name="android.intent.category.LAUNCHER" />
   </intent-filter>
   </activity>
   </application>

</manifest>

lv3.

_________________
MB over and out _______________________

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