蓝牙耳机录音

来源：互联网发布：4 2网络协议转换器编辑：程序博客网时间：2024/05/02 03:03

http://www.btspeaker.com/thread-792-1-1.html

前天想找个蓝牙录音程序，发现居然没有！没办法，就自己动手DIY了。一些关键代码摘出来，希望对大家有用。

本代码基于android 2.2以上。IOS就不要问我了，不越狱的IOS设备，蓝牙除了用蓝牙耳机，再就是IOS设备之间联机游戏，不可理喻！

一、初始化
添加权限：
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
<uses-permission android:name="android.permission.BROADCAST_STICKY" />

......
private static String mFileName = null;
private MediaRecorder mRecorder = null;
private MediaPlayer mPlayer = null;
private AudioManager mAudioManager = null;
......
mAudioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
......


二、录音
private void startRecording() {
//获得文件保存路径。记得添加android.permission.WRITE_EXTERNAL_STORAGE权限
mFileName = Environment.getExternalStorageDirectory().getAbsolutePath();
mFileName += "/btrecorder.3gp";

      mRecorder = new MediaRecorder();
      mRecorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
      mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
      mRecorder.setOutputFile(mFileName);
      mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
      try {
         mRecorder.prepare();//如果文件打开失败，此步将会出错。
      } catch (IOException e) {
         Log.e(LOG_TAG, "prepare() failed");
      }

      if(!mAudioManager.isBluetoothScoAvailableOffCall()){
         Log.d(LOG_TAG, "系统不支持蓝牙录音");
      return;
      }
//蓝牙录音的关键，启动SCO连接，耳机话筒才起作用
      mAudioManager.startBluetoothSco();
      //蓝牙SCO连接建立需要时间，连接建立后会发出ACTION_SCO_AUDIO_STATE_CHANGED消息，通过接收该消息而进入后续逻辑。
      //也有可能此时SCO已经建立，则不会收到上述消息，可以startBluetoothSco()前先stopBluetoothSco()
      registerReceiver(new BroadcastReceiver() {
         @Override
         public void onReceive(Context context, Intent intent) {
            int state = intent.getIntExtra(AudioManager.EXTRA_SCO_AUDIO_STATE, -1);

            if (AudioManager.SCO_AUDIO_STATE_CONNECTED == state) {
mAudioManager.setBluetoothScoOn(true);  //打开SCO
                  mRecorder.start();//开始录音
                  unregisterReceiver(this);  //别遗漏
            }else{//等待一秒后再尝试启动SCO
                  try {
                  Thread.sleep(1000);
            } catch (InterruptedException e) {
      e.printStackTrace();
            }
                  mAudioManager.startBluetoothSco();
            }
         }
      }, new IntentFilter(AudioManager.ACTION_SCO_AUDIO_STATE_CHANGED));
}

三、停止录音
private void stopRecording() {
mRecorder.stop();
      mRecorder.release();
      mRecorder = null;
      if(mAudioManager.isBluetoothScoOn()){
         mAudioManager.setBluetoothScoOn(false);
         mAudioManager.stopBluetoothSco();
      }
}

四、播放录音到A2DP
private void startPlaying() {
      mPlayer = new MediaPlayer();
      try {
         if(!mAudioManager.isBluetoothA2dpOn()) mAudioManager.setBluetoothA2dpOn(true); //如果A2DP没建立，则建立A2DP连接
         mAudioManager.stopBluetoothSco();//如果SCO没有断开，由于SCO优先级高于A2DP，A2DP可能无声音
         try {
Thread.sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
         }
         mAudioManager.setStreamSolo(AudioManager.STREAM_MUSIC, true);
         //让声音路由到蓝牙A2DP。此方法虽已弃用，但就它比较直接、好用。
         mAudioManager.setRouting(AudioManager.MODE_NORMAL, AudioManager.ROUTE_BLUETOOTH_A2DP, AudioManager.ROUTE_BLUETOOTH);
         mPlayer.setDataSource(mFileName);
         mPlayer.prepare();
         mPlayer.start();
      } catch (IOException e) {
         Log.e(LOG_TAG, "prepare() failed");
      }
}

五、停止A2DP播放
private void stopPlaying() {
      mPlayer.release();
      mPlayer = null;
      mAudioManager.setStreamSolo(AudioManager.STREAM_MUSIC, false);
}

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