android - SpeechRecognizer在第一次收听时引发onError

在Android 5中，我遇到了奇怪的问题。对SpeechRecognizer的startListening的第一次调用导致错误代码为7的onError( ERROR_NO_MATCH )。

我使用以下代码制作了测试应用:

if (speechRecognizer == null) {

    speechRecognizer = SpeechRecognizer.createSpeechRecognizer(this);
    speechRecognizer.setRecognitionListener(new RecognitionListener() {
        @Override
        public void onReadyForSpeech(Bundle bundle) {
            Log.d(TAG, "onReadyForSpeech");
        }

        @Override
        public void onBeginningOfSpeech() {
            Log.d(TAG, "onBeginningOfSpeech");
        }

        @Override
        public void onRmsChanged(float v) {
            Log.d(TAG, "onRmsChanged");
        }

        @Override
        public void onBufferReceived(byte[] bytes) {
            Log.d(TAG, "onBufferReceived");
        }

        @Override
        public void onEndOfSpeech() {
            Log.d(TAG, "onEndOfSpeech");
        }

        @Override
        public void onError(int i) {
            Log.d(TAG, "onError " + i);
        }

        @Override
        public void onResults(Bundle bundle) {
            Log.d(TAG, "onResults");
        }

        @Override
        public void onPartialResults(Bundle bundle) {
            Log.d(TAG, "onPartialResults");
        }

        @Override
        public void onEvent(int i, Bundle bundle) {
            Log.d(TAG, "onEvent");
        }
    });
}

final Intent sttIntent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
sttIntent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,
        RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
sttIntent.putExtra(RecognizerIntent.EXTRA_LANGUAGE, "en");
sttIntent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_PREFERENCE, "en");

speechRecognizer.startListening(sttIntent);

并在第一次startListening调用后收到以下日志消息:

onError 7
onReadyForSpeech
onBeginningOfSpeech
onEndOfSpeech
onResults

并在另一个startListening调用之后出现以下消息:

onRmsChanged
...
onRmsChanged
onReadyForSpeech
onRmsChanged
...
onRmsChanged
onBeginningOfSpeech
onRmsChanged
...
onRmsChanged
onEndOfSpeech
onRmsChanged
onRmsChanged
onRmsChanged
onResults

那么，此错误的原因是什么，我该如何解决？

最佳答案

我遇到了同样的问题，但是找不到解决方法，所以如果startListening和onError之间的时间过短，我最终只是在onError内部调用return。

protected long mSpeechRecognizerStartListeningTime = 0;

protected synchronized void speechRecognizerStartListening(Intent intent) {
    if (mSpeechRecognizer != null) {
        this.mSpeechRecognizerStartListeningTime = System.currentTimeMillis();
        RLog.d(this, "speechRecognizerStartListening");
        this.mSpeechRecognizer.startListening(intent);
    }
}
...
@Override
public synchronized void onError(int error) {
    RLog.i(this, this.hashCode() + " - onError:" + error);

// Sometime onError will get called after onResults so we keep a boolean to ignore error also
    if (mSuccess) {
        RLog.w(this, "Already success, ignoring error");
        return;
    }

    long duration = System.currentTimeMillis() - mSpeechRecognizerStartListeningTime;
    if (duration < 500 && error == SpeechRecognizer.ERROR_NO_MATCH) {
        RLog.w(this, "Doesn't seem like the system tried to listen at all. duration = " + duration + "ms. This might be a bug with onError and startListening methods of SpeechRecognizer");
        RLog.w(this, "Going to ignore the error");
        return;
    }

// -- actual error handing code goes here.
}