The document provides a tutorial on creating a Yes/No dialog box in Android using AlertDialog. It details the steps to set icons, titles, messages, and buttons for user interaction, as well as how to manage the dialog's display and cancellation. The author, Bruno Delb, is noted for his expertise in mobile application development.

1. Develop on Android
Android Lab Test
www.AndroidLabTest.com
Youku
By Bruno Delb
www.weibo.com/brunodelb
i.youku.com/brunodelb | www.weibo.com/brunodelb | blog.delb.cn
http://i.youku.com/brunoparis
Weibo
Officialsite
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

10. Follow me on my channel PengYooTV …
On my Youku channel
http://i.youku.com/brunoparis
Who am I ?
Bruno Delb (www.delb.cn),
Author of the first french book of development of Java mobile application (2002),
Consultant, project manager and developer of social & mobile applications,
let’s talk about your needs ...
And on Weibo :
http://www.weibo.com/brunodelb