Android音量控制调节

//音量控制,初始化定义
AudioManager mAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
//最大音量
int maxVolume = mAudioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
//当前音量
int currentVolume = mAudioManager.getStreamVolume(AudioManager.STREAM_MUSIC);

if(isSilent){
mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 0, 0);
}else{
mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, tempVolume, 0); //tempVolume:音量绝对值
}

//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);
}