如果未捕获任何内容，则取消 SpeechRecognition

Question

我正在尝试开发一款能够倾听并回馈用户的应用。我正在努力让它尽可能免提。

我的问题是，如果用户没有及时响应，SpeechRecognition 会超时，用户需要按下按钮重新开始收听。

*我有没有办法解决如果应用程序没有听到任何声音，它会提示重试并重新启动侦听器？

代码：

//Function i call when a user input is required.
private void promptSpeechInput() {
    Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
    intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,
            RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
    intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE, Locale.getDefault());
    try {
        startActivityForResult(intent, REQ_CODE_SPEECH_INPUT);
    } catch (ActivityNotFoundException a) {
        Toast.makeText(getApplicationContext(),
                getString(R.string.speech_not_supported),
                Toast.LENGTH_SHORT).show();
    }
}

/**
 * Receiving speech input
 * */
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    System.out.println("REQUEST CODE: " + requestCode);

    switch (requestCode) {
        case REQ_CODE_SPEECH_INPUT: {
            System.out.println("resultCode: " + resultCode);
            if (resultCode == RESULT_OK && null != data) {
                ArrayList<String> result = data.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);
                txtSpeechInput.setText(result.get(0));
                input = result.get(0).toLowerCase();
            }
            break;
        }

    }
}

我还有代码可以向用户读取文本，然后在完成后提示语音输入。

如果我可以提供更多详细信息或代码，请告诉我。非常感谢！

Answer 1

要在不点击“麦克风按钮”的情况下让谷歌语音免提，你必须为识别器创建自己的类，我在 xamarin-android 中编写了代码，所以它在 java 上非常相似：

Public class CustomRecognizer : Java.Lang.Object, IRecognitionListener, TextToSpeech.IOnInitListener
{
private SpeechRecognizer _speech;
private Intent _speechIntent;


public string Words;


public CustomRecognizer(Context _context)
{
    this._context = _context;
    Words = "";
    _speech = SpeechRecognizer.CreateSpeechRecognizer(this._context);
    _speech.SetRecognitionListener(this);
    _speechIntent = new Intent(RecognizerIntent.ActionRecognizeSpeech);
    _speechIntent.PutExtra(RecognizerIntent.ExtraLanguageModel, RecognizerIntent.LanguageModelFreeForm);
    _speechIntent.PutExtra(RecognizerIntent.ActionRecognizeSpeech, RecognizerIntent.ExtraPreferOffline);
    _speechIntent.PutExtra(RecognizerIntent.ExtraSpeechInputCompleteSilenceLengthMillis, 1000); 
    _speechIntent.PutExtra(RecognizerIntent.ExtraSpeechInputPossiblyCompleteSilenceLengthMillis, 1000);
    _speechIntent.PutExtra(RecognizerIntent.ExtraSpeechInputMinimumLengthMillis, 1500);
}

void startover()
{
    _speech.Destroy();
    _speech = SpeechRecognizer.CreateSpeechRecognizer(this._context);
    _speech.SetRecognitionListener(this);
    _speechIntent = new Intent(RecognizerIntent.ActionRecognizeSpeech);
    _speechIntent.PutExtra(RecognizerIntent.ExtraSpeechInputCompleteSilenceLengthMillis, 1000);
    _speechIntent.PutExtra(RecognizerIntent.ExtraSpeechInputPossiblyCompleteSilenceLengthMillis, 1000);
    _speechIntent.PutExtra(RecognizerIntent.ExtraSpeechInputMinimumLengthMillis, 1500);
StartListening();
}
public void StartListening()
{
    _speech.StartListening(_speechIntent);
}

public void StopListening()
{
    _speech.StopListening();
}

public void OnBeginningOfSpeech()
{

}

public void OnBufferReceived(byte[] buffer)
{
}

public void OnEndOfSpeech()
{

}

public void OnError([GeneratedEnum] SpeechRecognizerError error)
{
    Words = error.ToString();
    startover();
}

当识别器超时时，会调用 OnError 事件 .在我的代码中，我使用 startover() 来重新开始录制。