在Android中连接蓝牙耳机后，如何在内置麦克风和耳机麦克风之间切换音频输入？

Question

I am working with a voice recognition app. After a bluetooth headset is successfully connected to my android device, I want to freely switch audio input between the inbuilt mic and headset mic, how to do it?

Answer 1

You can use the following code to switch bluetooth headset mic.

AudioManager audiomanager= (AudioManager)mContext.getSystemService(Context
            .AUDIO_SERVICE);
IntentFilter intentFilter = new IntentFilter(AudioManager.ACTION_SCO_AUDIO_STATE_UPDATED);
    mContext.registerReceiver(mBluetoothScoReceiver, intentFilter);
audiomanager.startBluetoothSco();

and listen for the broadcast receiver.

private BroadcastReceiver mBluetoothScoReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        int state = intent.getIntExtra(AudioManager.EXTRA_SCO_AUDIO_STATE, -1);

        if (state == AudioManager.SCO_AUDIO_STATE_CONNECTED) {
            // Start recording audio
            log("audio connected");
            startRecording();
        } else if(state == AudioManager.SCO_AUDIO_STATE_DISCONNECTED){
            log("audio disconnected");
        }
    }
};

and for switching(to disconnect bluetooth headset mic) you can use this code.

mAudioManager.stopBluetoothSco();