1 hello world
check if you got JDK : window flag, type add remove program, look for
java se development kit (64bit) if not go online search JDK download.
next DL and install :
android studio 64bit
open your mobil device for developing search the walkthrough for your phone.
in the now visible phone developer options (on your phone), enable usb debugging
in android studio (on your computer)
blank or empty activity
deploying an emulator : click the green arrow on the top toolbar, select your usb connected android phone
your activityname.xml tab, design tab, pallette tab, drag drop elements to the phone picture.
such as button, in the text tab now you can see code has been generated for the pallette
you can edit the code or copy paste change it to add palletes with text.
mark select the button, widgets, right click constraint layout, infer constraints
text (double click tab to go bigger screen)
in the button on click property type the methode name topClick for example
the java code methode name must match
the buttons need you to write methodes or they will crash the apk :
in the code view :
stand with mouse on error (red code) area,
Alt + Enter keyboard combination to import the View class and remove the errors
you will see the messages when you run the apk and click the btns. :bounce:
check if you got JDK : window flag, type add remove program, look for
java se development kit (64bit) if not go online search JDK download.
next DL and install :
android studio 64bit
open your mobil device for developing search the walkthrough for your phone.
in the now visible phone developer options (on your phone), enable usb debugging
in android studio (on your computer)
blank or empty activity
deploying an emulator : click the green arrow on the top toolbar, select your usb connected android phone
your activityname.xml tab, design tab, pallette tab, drag drop elements to the phone picture.
such as button, in the text tab now you can see code has been generated for the pallette
you can edit the code or copy paste change it to add palletes with text.
mark select the button, widgets, right click constraint layout, infer constraints
text (double click tab to go bigger screen)
Code:
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="topClick"
android:text="Button"
tools:layout_constraintTop_creator="1"
android:layout_marginStart="16dp"
android:layout_marginTop="26dp"
tools:layout_constraintLeft_creator="1"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginLeft="394dp" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="buttomClick"
android:text="Button2"
tools:layout_constraintTop_creator="1"
android:layout_marginStart="16dp"
android:layout_marginTop="37dp"
app:layout_constraintTop_toBottomOf="@+id/button"
tools:layout_constraintLeft_creator="1"
app:layout_constraintLeft_toLeftOf="parent"
android:layout_marginLeft="16dp" />in the button on click property type the methode name topClick for example
the java code methode name must match
the buttons need you to write methodes or they will crash the apk :
in the code view :
Code:
package com.example.lenovo.myapplication;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Toast;
public class helloworld extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_helloworld);
Toast.makeText(this, "Can you see me", Toast.LENGTH_SHORT).show();
Log.i("info", "Done creating the app");
}
public void topClick(View v){ Toast.makeText(this, "Top button clicked", Toast.LENGTH_SHORT).show(); Log.i("info","The user clicked the top button"); }
public void buttomClick(View v){ Toast.makeText(this, "Bottom button clicked", Toast.LENGTH_SHORT).show(); Log.i("info","The user clicked the bottom button"); }
}stand with mouse on error (red code) area,
Alt + Enter keyboard combination to import the View class and remove the errors
you will see the messages when you run the apk and click the btns. :bounce: