Android 打开/关闭扬声器

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     private static int currVolume = 0;

     //打开扬声器
     public void OpenSpeaker() {
         try{     

//判断扬声器是否在打开

         AudioManager audioManager =(AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE); 

         audioManager.setMode(AudioManager.ROUTE_SPEAKER);

//获取当前通话音量

         currVolume =audioManager.getStreamVolume(AudioManager.STREAM_VOICE_CALL);

        if(!audioManager.isSpeakerphoneOn()) {
          audioManager.setSpeakerphoneOn(true);

           audioManager.setStreamVolume(AudioManager.STREAM_VOICE_CALL,
                 audioManager.getStreamMaxVolume(AudioManager.STREAM_VOICE_CALL ),
                 AudioManager.STREAM_VOICE_CALL);
         }
        } catch (Exception e) {
            e.printStackTrace();
        }
     }

    //关闭扬声器
    public void CloseSpeaker() {
    
        try {
            AudioManageraudioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);
           if(audioManager != null) {
               if(audioManager.isSpeakerphoneOn()) {
                 audioManager.setSpeakerphoneOn(false);
                 audioManager.setStreamVolume(AudioManager.STREAM_VOICE_CALL,currVolume,
                            AudioManager.STREAM_VOICE_CALL);
               }
            }
        } catch (Exception e) {
           e.printStackTrace();
        }
         //Toast.makeText(context,"揚聲器已經關閉",Toast.LENGTH_SHORT).show();
    }

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