Android Volume Control

AudioManager   mAudioManager = (AudioManager) this.getSystemService(Context.AUDIO_SERVICE);

   int current_volume =mAudioManager.getStreamVolume(AudioManager.STREAM_MUSIC);

   //If you want to player is mute ,then set_volume variable is zero.Otherwise you may supply some value.

   int set_volume=0;

   mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC,set_volume, 0);