android - 通过蓝牙播放 TTS

Question

我有一个小应用程序，如果已连接，我希望能够将 TTS 音频发送到扬声器或蓝牙耳机。它在免提电话模式下工作正常，但 BT 就不行了。知道如何解决这个问题吗？代码 fragment 如下:'

private void speak(String s){

        HashMap<String, String> hash = new HashMap<String, String>(); 

        hash.put(TextToSpeech.Engine.KEY_PARAM_STREAM, String.valueOf(AudioManager.STREAM_SYSTEM));



        AudioManager audioManager = (AudioManager) getSystemService(AUDIO_SERVICE);

        audioManager.setMode(AudioManager.MODE_NORMAL);
        audioManager.startBluetoothSco();
        audioManager.setBluetoothScoOn(true);

        tts.speak(s, TextToSpeech.QUEUE_ADD, hash);



     }

'

Answer 1

在 Using the Android RecognizerIntent with a bluetooth headset 使用我的答案

在您声明 private void speak(String s) 的 Activity 中添加类成员

BluetoothHeadsetUtils mBluetoothHelper;
TelephonyManager mTelManager;
MyPhoneStateListener mPhoneStateListener = new MyPhoneStateListener();

在同一 Activity onCreate() 添加

@Override
public void onCreate()
{
     mBluetoothHelper = new BluetoothHeadsetUtils(this);
     mTelManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
     mTelManager.listen(mPhoneStateListener, PhoneStateListener.LISTEN_CALL_STATE);
}  

并为activity添加onResume()和onPause

@Override
onResume()
{ 
    mBluetoothHelper.start();
}

@Override
onPause()
{
    mBluetoothHelper.stop();
}

您可以将您的 speak(String s) 定义为

public void speak(String s, String utteranceId) // utteranceId can be an empty string
{
    HashMap<String, String> myHashRender = new HashMap<String, String>();
    myHashRender.put(TextToSpeech.Engine.KEY_PARAM_UTTERANCE_ID, utteranceId);
    if (mBluetoothHelper.isOnHeadsetSco())
    {
        myHashRender.put(TextToSpeech.Engine.KEY_PARAM_STREAM, 
                String.valueOf(AudioManager.STREAM_VOICE_CALL));
    }
    tts.speak(s, TextToSpeech.QUEUE_ADD, myHashRender);
}

使用电话状态监听器代替广播接收器

protected class MyPhoneStateListener extends PhoneStateListener
{

    @Override
    public void onCallStateChanged(int state, String incomingNumber)
    {

                switch (state)
                {
                    case TelephonyManager.CALL_STATE_RINGING:

                            mAudioManager.setStreamMute(AudioManager.STREAM_RING, true);
                            speak("whatever you want here", "ringing"); //$NON-NLS-1$

                            Log.d(TAG, "ringing cancel recognizer");  //$NON-NLS-1$

                        break;

                    case TelephonyManager.CALL_STATE_OFFHOOK:


                            Log.d(TAG, "offhook cancel recognizer");  //$NON-NLS-1$

                        break;

                    case TelephonyManager.CALL_STATE_IDLE:


                        new Thread(new Runnable()
                        {   
                            @Override
                            public void run()
                            {
                                try
                                {
                                    Thread.sleep(2000);
                                }
                                catch (InterruptedException e)
                                {

                                }
                                mBluetoothHelper.start();
                            }
                        }).start();
                        Log.d(TAG, "call state idle");  //$NON-NLS-1$

            }


    }
}

在您的 Activity 或服务中添加实现 OnUtteranceCompletedListener 并添加以下代码

@Override
public void onUtteranceCompleted(String utteranceId)
{
    if (utteranceId.equals("ringing"))
    {
        mAudioManager.setStreamMute(AudioManager.STREAM_RING, false);
        mBluetoothHelper.stop();
    }
}