Android音量控制调节

http://blog.csdn.net/hufeng882412/article/details/7310131

 //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);

直接控制音量的多少:

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

以一步步长控制音量的增减，并弹出系统默认音量控制条：

 //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);
 }