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);  
}