Question

In my application I have only one activity and I am using ViewAnimator for changing the screen. For the Menu and Back Keys I am trying to pause the activity (like home key does) and show a menu or go back to previous View.

Angry Birds do the same think (Angry Birds Rio do exactly the same thing what I want).

I have also checked the OnKeyDown event to find out how the Home key work but I think it is handled by the system.

http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/1.5_r4/android/app/Activity.java#Activity.onKeyDown%28int%2Candroid.view.KeyEvent%29

Thanks.

Answer 1

In order to catch the menu key:

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    //return true to show some menu
    //return false to not show any menu
}

Read more here: http://developer.android.com/reference/android/app/Activity.html#onCreateOptionsMenu(android.view.Menu)

Ir order to catch the back key event:

@Override
public boolean onKeyUp(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {
        //do your stuff and Return true to prevent this event from being propagated further
        return true;
    }

    return false;
}

Read more here: http://developer.android.com/reference/android/app/Activity.html#onKeyUp(int, android.view.KeyEvent)

EDIT:
Pausing your application’s logic is up to you. But you can show an AlertDialog with up to three buttons and/or any View you want: http://developer.android.com/reference/android/app/AlertDialog.html