Android Lab Test : Creating a dialog Yes/No (english) Video of tutorial on : https://www.youtube.com/playlist?list=PLL2Z3bzdO25yHwIV3XdMzKs61At0Ldh6L Visit http://www.AndroidLabTest.com

1. Develop on Android
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Lesson : The dialog, YesNo

2. The dialog, YesNo
• In this lesson, you will learn to create and display a
dialog box.
• For this, you will use the Dialog.

3. The dialog, YesNo
• To create a new Dialog, call the method Builder.
AlertDialog.Builder alertDialog = new AlertDialog.Builder(Main.this);
• You can specify an icon with he method setIcon(), a title with the
method setTitle() and a message with the method setMessage().
alertDialog.setIcon(R.drawable.app);
alertDialog.setTitle("Your title");
alertDialog.setMessage("Your message");

4. The dialog, YesNo
• To add a button « positive » (in the meaning of « Yes »), call themethod
setPositiveButton(). Then add a listener OnClickListener and the method
onClick().
alertDialog.setPositiveButton("Yes!", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int arg1) { }
});
• Repeat the operation with a button « negative » (in the meaning of « No »),
with the method setNegativeButton().
alertDialog.setNegativeButton("No!", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int arg1) { }
});

5. The dialog, YesNo
• To manage the action of cancel, call the methode setOnCancelListener.
alertDialog.setOnCancelListener(new DialogInterface.OnCancelListener(){
public void onCancel(DialogInterface dialog) { }
});
• To display the Dialog, call the method show() :
alertDialog.show();

6. Layout main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<Button
android:id="@+id/btnShow"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Show" />
</LinearLayout>

7. File Main.java
public class Main extends Activity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button btnShow = (Button)findViewById (R.id.btnShow);
btnShow.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
AlertDialog.Builder alertDialog = new AlertDialog.Builder(Main.this);
alertDialog.setIcon(R.drawable.app);
alertDialog.setTitle("Your title");
alertDialog.setMessage("Your message");

8. File Main.java
alertDialog.setPositiveButton("Yes!", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int arg1) { }
});
alertDialog.setNegativeButton("No!", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int arg1) { }
});
alertDialog.setOnCancelListener(new DialogInterface.OnCancelListener(){
public void onCancel(DialogInterface dialog) { }
});
alertDialog.show();
}
});
}
}

9. Test on your mobile
Dialog_YesNo

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