android 获取系统中各种类型音量及对音量设置

通过程序获取android系统手机的铃声和音量。同样，设置铃声和音量的方法也很简单！

   1. AudioManager mAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

//通话音量

   1. int max = mAudioManager.getStreamMaxVolume( AudioManager.STREAM_VOICE_CALL );
   2.     int current = mAudioManager.getStreamVolume( AudioManager.STREAM_VOICE_CALL );
   3.     Log.d("VIOCE_CALL", "max : " + max + " current : " + current);

//系统音量

   1. max = mAudioManager.getStreamMaxVolume( AudioManager.STREAM_SYSTEM );
   2.     current = mAudioManager.getStreamVolume( AudioManager.STREAM_SYSTEM );
   3.     Log.d("SYSTEM", "max : " + max + " current : " + current);

//铃声音量

   1. max = mAudioManager.getStreamMaxVolume( AudioManager.STREAM_RING );
   2.     current = mAudioManager.getStreamVolume( AudioManager.STREAM_RING );
   3.     Log.d("RING", "max : " + max + " current : " + current);

//音乐音量（媒体音量的设置）

   1. max = mAudioManager.getStreamMaxVolume( AudioManager.STREAM_MUSIC );
   2.     current = mAudioManager.getStreamVolume( AudioManager.STREAM_MUSIC );
   3.     Log.d("MUSIC", "max : " + max + " current : " + current);

//提示声音音量

   1. max = mAudioManager.getStreamMaxVolume( AudioManager.STREAM_ALARM );
   2.     current = mAudioManager.getStreamVolume( AudioManager.STREAM_ALARM );
   3.     Log.d("ALARM", "max : " + max + " current : " + current);

设置音量的方法也很简单，AudioManager提供了方法：
public void setStreamVolume(int streamType, int index, int flags)
其中 streamType 有内置的常量，去文档里面就可以看到