The document provides instructions for creating a dynamic menu in an Android application using methods like onCreateOptionsMenu and onOptionsItemSelected. It details how to add menu items, set shortcut keys, and assign icons to those items, along with example Java code and XML layout. The author, Bruno Delb, is an experienced developer and consultant in mobile application development.

1. Develop on Android
Android Lab Test
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By Bruno Delb
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Lesson : Menu created dynamically

2. Menu created dynamically
• In this lesson, you will learn to create a menu
dynamically.
• For this, you will use MenuItem and
onOptionsItemSelected.

3. Menu created dynamically
• To create the menu, use the method onCreateOptionsMenu().
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
...
return true;
}
• To select the keyboard mode (for example if you use
shortcuts), use the method setQwertyMode() :
menu.setQwertyMode(true);

4. Menu created dynamically
• To add an item to the menu, use the method add() :
MenuItem menuItem2 = menu.add(0, 1, 1, "Item 2");
• To add a shortcut on an item of the menu, use the method
setAlphabeticShortcut() :
menuItem2.setAlphabeticShortcut('b');
• To add an icon to an item of the menu, use the methode setIcon.
menuItem2.setIcon (R.drawable.app);

5. Menu created dynamically
• The method onOptionsItemSelected() is called at each selection of
an item of the menu with as argument the selected item MenuItem.
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case 0: // Item 1
return true;
case 1: // Item 2
return true;
}
return false;
}

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">
</LinearLayout>

7. File Main.java
public class Main extends Activity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
menu.setQwertyMode(true);
MenuItem menuItem1 = menu.add(0, 0, 0, "Item 1");
menuItem1.setAlphabeticShortcut('a');
MenuItem menuItem2 = menu.add(0, 1, 1, "Item 2");
menuItem2.setAlphabeticShortcut('b');
menuItem2.setIcon (R.drawable.app);
MenuItem menuItem3 = menu.add(0, 2, 2, "Item 3");
menuItem3.setAlphabeticShortcut('c');
return true;
}

8. File Main.java
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case 0:
Toast.makeText(this, "Item 1", Toast.LENGTH_LONG).show();
return true;
case 1:
Toast.makeText(this, "Item 2", Toast.LENGTH_LONG).show();
return true;
case 2:
Toast.makeText(this, "Item 3", Toast.LENGTH_LONG).show();
return true;
}
return false;
}
}

9. Test on your mobile
View_Menu_Dynamic

10. Follow me on my channel PengYooTV …
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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