Volume always the same?

Question

I have the following code, and I want to get the difference of the previous volume before holding the volume button and the current volume. But, when I was debugging, I fou

Answer 1

You probably aren't changing the media volume on your device. To verify go to Settings->Sound & Notification and try changing the Media volume found there.

You probably also want to update update your previousVolume after a change too:

@Override
public void onChange(boolean selfChange) {
    super.onChange(selfChange);

    AudioManager audio = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
    int currentVolume = audio.getStreamVolume(AudioManager.STREAM_MUSIC);

    processVolumeChange(currentVolume);
}

public void processVolumeChange(int currentVolume) {
    MyService mService = new MyService();
    mService.volumeCheck(previousVolume - currentVolume); //Method in my service
    previousVolume = currentVolume;
}