Listen to volume changes events on Android

Question

Is there any way to listen to the event of volume change on Android, without just taking over the volume buttons?

The only thing I\'ve found that works is here, but

Answer 1

Better, you can register a ContentObserver as follows:

  getApplicationContext().getContentResolver().registerContentObserver(android.provider.Settings.System.CONTENT_URI, true, new ContentObserver(){...} );

Your ContentObserver might look like this:

public class SettingsContentObserver extends ContentObserver {
    private AudioManager audioManager;

    public SettingsContentObserver(Context context, Handler handler) {
        super(handler);
        audioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
    }

    @Override
    public boolean deliverSelfNotifications() {
        return false;
    }

    @Override
    public void onChange(boolean selfChange) {
        int currentVolume = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);

        Log.d(TAG, "Volume now " + currentVolume);
    }
}

When done:

getApplicationContext().getContentResolver().unregisterContentObserver(mContentObserver);

One caution, though - sometimes the notifications seem to be delayed if there are lots of button presses quickly.