AudioManager mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
int maxVolume = mAudioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
int mLastProgress=2;
mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, maxVolume * mLastProgress / 10, 0);
只不过通过这种方式设置完成后最好还原一下声音