AudioManager音量控制调节

//降低音量，调出系统音量控制if(flag == 0){  mAudioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC,AudioManager.ADJUST_LOWER,                            AudioManager.FX_FOCUS_NAVIGATION_UP);}//增加音量，调出系统音量控制else if(flag == 1){  mAudioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC,AudioManager.ADJUST_RAISE,                            AudioManager.FX_FOCUS_NAVIGATION_UP);}