This document provides a tutorial on how to add a contextual menu to a view in an Android application. It outlines the necessary methods and code snippets to create a contextual menu, register it to a button, and handle item selections. Additionally, it includes layout and menu resource files required for implementation.

1. Develop on Android
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Lesson : The contextual menu

2. The contextual menu
• In this lesson, you will learn to add a
contextual menu to a view.
• For this, you will use the methods of the
ContextMenu.

3. The contextual menu
• In first, the contextual menu shoud be attached to an object, for
example to a button :
registerForContextMenu(btnMenu);

4. The contextual menu
• The contextual menu should be created with the method
onCreateContextMenu().
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenu.ContextMenuInfo menuInfo) {
super.onCreateContextMenu(menu, v, menuInfo);
getMenuInflater().inflate(R.menu.contextmenu, menu);
menu.setHeaderTitle("Choose an option");
}

5. The contextual menu
• To each selection of an option of the contextual menu,
the method onContextItemSelected() is called with in his
parameter the selected item (MenuItem).
public boolean onContextItemSelected(MenuItem item) {
switch(item.getItemId()) {
case R.id.option1: return true;
case R.id.option2: return true;
case R.id.option3: return true;
}
return super.onContextItemSelected(item);
}

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/btnMenu"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Menu" />
</LinearLayout>

7. Menu resmenucontextmenu.xml
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:id="@+id/option1"
android:title="Option 1" />
<item
android:id="@+id/option2"
android:title="Option 2" />
<item
android:id="@+id/option3"
android:title="Option 3" />
</menu>

8. File Main.java
public class Main extends Activity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button btnMenu = (Button)findViewById (R.id.btnMenu);
btnMenu.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
openContextMenu(v);
}
});
registerForContextMenu(btnMenu);
}
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo
menuInfo) {
super.onCreateContextMenu(menu, v, menuInfo);
getMenuInflater().inflate(R.menu.contextmenu, menu);
menu.setHeaderTitle("Choose an option");
}

9. File Main.java
public boolean onContextItemSelected(MenuItem item) {
switch(item.getItemId()) {
case R.id.option1:
Toast.makeText(this,"Option 1",1000).show();
return true;
case R.id.option2:
Toast.makeText(this,"Option 2",1000).show();
return true;
case R.id.option3:
Toast.makeText(this,"Option 3",1000).show();
return true;
}
return super.onContextItemSelected(item);
}
}

10. Test on your mobile
View_Menu_Context

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