Creating an Options Menu

Creating a Menu Resource

you should define a menu and all its items in an XML menu resource, then inflate the menu resource (load it as a programmable object) in your application code.
To create a menu resource, create an XML file inside your project's res/menu/ directory.

example.

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" >
    <item
        android:id="@+id/item1"
        android:icon="@android:drawable/ic_menu_edit"
        android:title="btn1">
    </item>
    <item
        android:id="@+id/item2"
        android:icon="@android:drawable/ic_menu_add"
        android:title="btn2">
    </item>
</menu>

Creating an Options Menu

When Press the menu key, Android Framework is called onCreateOptionsMenu method in Activity class.
To inflate a menu resource.

@Override
    public boolean onCreateOptionsMenu(Menu menu){
      super.onCreateOptionsMenu(menu);
      getMenuInflater().inflate(R.menu.menu,menu);
      return true;
    }

Responding to user action

When User selected in menu item, Android Framework is called onOptionsItemSelected method in Activity class.

@Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle item selection
        switch (item.getItemId()) {
        case R.id.item1:
         //action item1
            return true;
        case R.id.item2:
         //action item2
            return true;
        default:
            return super.onOptionsItemSelected(item);
        }
    }