如何检测android上是否有语音转文本功能？

Question

我相信我已经知道了如何检测android设备是否有麦克风，如下所示：

Intent speechIntent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
        List<ResolveInfo> speechActivities = packageManager.queryIntentActivities(speechIntent, 0);
        TextView micAvailView = (TextView) findViewById(R.id.mic_available_flag);
        if (speechActivities.size() != 0) { //we have a microphone

        }
        else { //we do not have a microphones

        }

然而，如何检测android设备是否具有语音转文本功能？还是应该使用上面的内容来检测这一点？如果有，如何检测设备是否有麦克风？

任何反馈都很感谢，谢谢。

Answer 1

在读完guido的答案后，这是我想到的。对我来说，这看起来很黑客，希望有更好的方法。我会接受guido的回答，但如果有更好的方法，请告诉我。

package;

import java.io.File;
import java.io.IOException;
import java.util.List;

import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.media.MediaRecorder;
import android.speech.RecognizerIntent;

public class MediaUtil {
    //returns whether a microphone exists
    public boolean getMicrophoneExists(Context context) {        
            PackageManager packageManager = context.getPackageManager();
    return packageManager.hasSystemFeature(PackageManager.FEATURE_MICROPHONE);
    }

    //returns whether the microphone is available
    public static boolean getMicrophoneAvailable(Context context) {
        MediaRecorder recorder = new MediaRecorder();
            recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        recorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);
        recorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);
        recorder.setOutputFile(new File(context.getCacheDir(), "MediaUtil#micAvailTestFile").getAbsolutePath());
        boolean available = true;
        try { 
            recorder.prepare();
        }
        catch (IOException exception) {
            available = false;
        }
        recorder.release();
        return available;
    }

    //returns whether text to speech is available
    public static boolean getTTSAvailable(Context context) {
        PackageManager packageManager = context.getPackageManager();
        Intent speechIntent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
        List<ResolveInfo> speechActivities = packageManager.queryIntentActivities(speechIntent, 0);
        if (speechActivities.size() != 0) return true;
        return false;
    }
}