语音识别不适用于 Android 5.1.1 Xamarin

Question

我正在尝试使用离线语音识别引擎来检测短语以激活我的应用上的命令。

[Activity(Label = "@string/app_name", Theme = "@style/AppTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation, ScreenOrientation = ScreenOrientation.Landscape)]
public class MainActivity : AppCompatActivity, IRecognitionListener
{
    Intent mSpeechRecognizerIntent;

    public override async void OnRequestPermissionsResult(int requestCode, string[] permissions, Permission[] grantResults)
    {
        Xamarin.Essentials.Platform.OnRequestPermissionsResult(requestCode, permissions, grantResults);


        if (grantResults.Where(x => x == Permission.Denied).Count() == 0)
        {
            SpeechRecognizer speechRecognizer = SpeechRecognizer.CreateSpeechRecognizer(this);
            speechRecognizer.SetRecognitionListener(this);

            mSpeechRecognizerIntent = new Intent(RecognizerIntent.ActionRecognizeSpeech);
            //mSpeechRecognizerIntent = new Intent(RecognizerIntent.ActionVoiceSearchHandsFree);


            mSpeechRecognizerIntent.PutExtra(RecognizerIntent.ExtraCallingPackage, PackageName);
            mSpeechRecognizerIntent.PutExtra(RecognizerIntent.ExtraPreferOffline, true);
            mSpeechRecognizerIntent.PutExtra(RecognizerIntent.ExtraPartialResults, true);
            mSpeechRecognizerIntent.PutExtra(RecognizerIntent.ExtraMaxResults, 5);
            mSpeechRecognizerIntent.PutExtra(RecognizerIntent.ExtraLanguageModel, "en");


            int max = 30000;

            //mSpeechRecognizerIntent.PutExtra(RecognizerIntent.ExtraLanguageModel, this.Resources.Configuration.Locale.Language);
            //mSpeechRecognizerIntent.PutExtra(RecognizerIntent.ExtraPrompt, "test");
            //mSpeechRecognizerIntent.PutExtra(RecognizerIntent.ExtraMaxResults, max);
            //mSpeechRecognizerIntent.PutExtra(RecognizerIntent.ExtraSpeechInputCompleteSilenceLengthMillis, max);
            ////mSpeechRecognizerIntent.PutExtra(RecognizerIntent.ExtraSpeechInputMinimumLengthMillis, max);
            //mSpeechRecognizerIntent.PutExtra(RecognizerIntent.ExtraSpeechInputPossiblyCompleteSilenceLengthMillis, max);

            speechRecognizer.StartListening(mSpeechRecognizerIntent);


        }

        base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
    }


    public void OnBeginningOfSpeech()
    {

    }

    public void OnBufferReceived(byte[] buffer)
    {

    }

    public void OnEndOfSpeech()
    {

    }

    public void OnError([GeneratedEnum] SpeechRecognizerError error)
    {
        Debugger.Log(0, "cat", "Speech error: " + error);
    }

    public void OnEvent(int eventType, Bundle @params)
    {

    }

    public void OnPartialResults(Bundle partialResults)
    {
        List<string> matches = partialResults.GetStringArrayList(SpeechRecognizer.ResultsRecognition).ToList();

        Debugger.Log(0, "cat", "Partial Matches are: " + string.Join(", ", matches.ToArray()) + "\r\n");

    }

    public void OnReadyForSpeech(Bundle @params)
    {

    }

    public void OnResults(Bundle results)
    {
        List<string> matches = results.GetStringArrayList(SpeechRecognizer.ResultsRecognition).ToList();

        Debugger.Log(0, "cat", "Matches are: " + string.Join(", ", matches.ToArray()) + "\r\n");
    }

    public void OnRmsChanged(float rmsdB)
    {

    }
}

它适用于我的 android 7.0 手机，但没有任何回调在我的 android 5.1.1 手机上触发。

当我在模拟器上尝试时。它给出了SpeechRecognizerError.Server 错误。

模拟器也不允许我下载任何离线引擎。

Android 5.1.1 手机确实下载了引擎，可以在 wifi 和数据关闭的情况下进行语音识别，但在我的应用程序中没有。

我该如何解决这个问题？

Answer 1

mSpeechRecognizerIntent.PutExtra(RecognizerIntent.ExtraPreferOffline, true);

这看起来会破坏您的代码，不确定但可能 Google 不支持它。 尝试对此发表评论。 //mSpeechRecognizerIntent.PutExtra(RecognizerIntent.ExtraPreferOffline, true);