您引用的视频使用Windows.Speech API，对于Android，您可能希望使用Android.Speech包。我不知道是否仍然如此，但您可能需要将以下内容添加到manifest文件中以使用它：

<intent>
    <action android:name="android.speech.RecognitionService" />
</intent>

至于Unity集成，Unity确实有一个内置的Microphone类，或者如果您可以访问Android包：

private const int Voice = 10;
private string _recognizedText;

private void Start()
{
    // Check if the device supports speech recognition
    if (!Android.Speech.Recognition.IsRecognitionAvailable(this))
    {
        Debug.LogError("Speech recognition is not available on this device!");
        return;
    }

    // Create a new intent for speech recognition
    var intent = new Intent(RecognizerIntent.ActionRecognizeSpeech);
    // Set the language for the intent
    intent.PutExtra(RecognizerIntent.ExtraLanguage, Java.Util.Locale.Default);
    // Start the activity for speech recognition
    StartActivityForResult(intent, Voice);
}

protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
{
    base.OnActivityResult(requestCode, resultCode, data);

    if (requestCode == Voice && resultCode == Result.Ok)
    {
        // Get the recognized text from the intent
        _recognizedText = data.GetStringExtra(RecognizerIntent.ExtraResultsRecognition);
        Debug.Log("Recognized text: " + _recognizedText);
    }
}