如何在不使 MediaPlayer 中的音乐静音的情况下使 SpeechRecognizer 的哔声静音

Question

是否可以在不使 MediaPlayer 播放的音乐静音的情况下使 SpeechRecognizer 的哔声静音？

这里代码：

speech = SpeechRecognizer.createSpeechRecognizer(this);
speech.setRecognitionListener(this);
recognizerIntent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
recognizerIntent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_PREFERENCE, "en");
recognizerIntent.putExtra(RecognizerIntent.EXTRA_CALLING_PACKAGE, this.getPackageName());
recognizerIntent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_WEB_SEARCH);
recognizerIntent.putExtra(RecognizerIntent.EXTRA_MAX_RESULTS, 1);

timer =  new Timer();
timer.schedule(new UpdateTimeTask(),500,2000);

MediaPlayer mp = new MediaPlayer(); 
AssetFileDescriptor afd = getResources().openRawResourceFd(R.raw.breathe);
mp.reset();
mp.setAudioStreamType(AudioManager.STREAM_MUSIC);
AudioManager myAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
myAudioManager.setStreamVolume(AudioManager.STREAM_ALARM, 0, 0);
try {
    mp.setDataSource(afd.getFileDescriptor(), afd.getStartOffset(), afd.getDeclaredLength());
    mp.prepare();
}
catch (IOException e) {
    e.printStackTrace();
}

mp.start();


class UpdateTimeTask extends TimerTask {
public void run() {

    mActivity.runOnUiThread(new Runnable() {

        @Override
        public void run() {
            speech.stopListening();
            speech.startListening(recognizerIntent);
        }
    });
}

音频对焦无法解决问题，正在播放音乐，我能听到哔哔声

我不能将STREAM_MUSIC（或整个STREAM_SYSTEM）静音，因为我将它用于MediaPlayer

静音STREAM_ALARM 不适用于SpeechRecognizer

那么如何在 MediaPlayer 播放音乐时将哔声静音

更新

boolean gotFocus = requestAudioFocusForMyApp(MainActivity.this);
        if (gotFocus) {
            MediaPlayer mp = new MediaPlayer();
            AssetFileDescriptor afd = getResources().openRawResourceFd(R.raw.breathe);
            mp.reset();
            mp.setAudioStreamType(AudioManager.STREAM_MUSIC);
            AudioManager myAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
            myAudioManager.setStreamVolume(AudioManager.STREAM_ALARM, 0, 0);
            try {
                mp.setDataSource(afd.getFileDescriptor(), afd.getStartOffset(), afd.getDeclaredLength());
                mp.prepare();
            } catch (IOException e) {
                e.printStackTrace();
            }
            mp.start();
        }

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Answer 1

我更新了我的答案。这应该有效。检查一下！

boolean gotFocus = requestAudioFocusForMyApp(this); /* bind with your context. */
/* You should pass your context of your service, because you are playing music via service. this parameter represents the context of your service */
                if(gotFocus) {
                   MediaPlayer mp = new MediaPlayer();
        AssetFileDescriptor afd = getResources().openRawResourceFd(R.raw.breathe);
        mp.reset();
        mp.setAudioStreamType(AudioManager.STREAM_MUSIC);
        AudioManager myAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
        myAudioManager.setStreamVolume(AudioManager.STREAM_ALARM, 0, 0);
        try {
            mp.setDataSource(afd.getFileDescriptor(), afd.getStartOffset(), afd.getDeclaredLength());
            mp.prepare();
        } catch (IOException e) {
            e.printStackTrace();
        }
        mp.start();
                }


private boolean requestAudioFocusForMyApp(final Context context) {
        AudioManager am = (AudioManager)context.getSystemService(Context.AUDIO_SERVICE);

        // Request audio focus for playback
        int result = am.requestAudioFocus(null,
                // Use the music stream.
                AudioManager.STREAM_MUSIC,
                // Request permanent focus.
                AudioManager.AUDIOFOCUS_GAIN);

        if (result == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
            Log.d("AudioFocus", "Audio focus received");
            return true;
        } else {
            Log.d("AudioFocus", "Audio focus NOT received");
            return false;
        }
    }

https://developer.android.com/reference/android/media/AudioFocusRequest.html