'Android BroadCastReceiver for volume key up and down

If a user presses volume key up or down is it possible to detect it in my broadcast receiver? I need the full code.

Here is my Intent filter

IntentFilter filter = new IntentFilter();
filter.addAction("android.media.VOLUME_CHANGED_ACTION");

and my onReceive method is

public void onReceive(Context arg0, Intent intent) {
      KeyEvent ke = (KeyEvent)intent.getExtras().get(Intent.EXTRA_KEY_EVENT);
        if (ke .getKeyCode() == KeyEvent.KEYCODE_VOLUME_UP) {
                System.out.println("I got volume up event");
         }else if (ke .getKeyCode() == KeyEvent.KEYCODE_VOLUME_DOWN) {
                System.out.println("I got volume key down event");
         }
    }

It gives me a null KeyEvent... any idea?

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'Android BroadCastReceiver for volume key up and down

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