Trigger system volume bar

Question

Is it possible by pressing a button in my Activity to make the volume bar appear? The volume bar is the view that appears when you press one of the hardware volume

Answer 1

Working code

AudioManager audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,
                    AudioManager.ADJUST_SAME, AudioManager.FLAG_SHOW_UI);