Android Tutorial Chapter 2 - Action Bar

EnableUpButton.java

// enables the "app icon" as the up button
// make sure to declare parent activity in the manifest
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_sample);
    
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    // if minSdkVersion >= 11, use this instead:
    // getActionBar().setDisplayHomeAsUpEnabled(true);
}

main_activity_actions.xml

<!-- Specify actions in XML -->
<!-- res/menu/main_activity_actions.xml -->

<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@+id/action_search"
          android:icon="@drawable/ic_action_search"
          android:title="@string/action_search"
          android:showAsAction="ifRoom" />  <!-- appear as action button if there is room, otherwise in the overflow -->
    <item android:id="@+id/action_settings"
          android:title="@string/action_settings"
          android:showAsAction="never" />   <!-- only appear in the overflow -->
</menu>

RespondingToAction.java

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case R.id.action_search:
            openSearch();
            return true;
        case R.id.action_settings:
            openSettings();
            return true;
        default:
            return super.onOptionsItemSelected(item);
    }
}