java - 如何检测语音转文本是否在 Android 上可用？

Question

我相信我已经想出如何检测 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

        }

但是，如何检测 android 设备是否具有语音转文本功能？或者应该用上面的来检测？如果是这样，如何检测设备是否有麦克风？

欢迎任何反馈，谢谢。

Answer 1

您附上的代码确实是用来检测音频识别是否可用[1]:

// Check to see if a recognition activity is present
PackageManager pm = getPackageManager();
List activities = pm.queryIntentActivities(
  new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH), 0);
if (activities.size() != 0) {
  speakButton.setOnClickListener(this);
} else {
  speakButton.setEnabled(false);
  speakButton.setText("Recognizer not present");
}

要测试麦克风是否存在，只需遵循 [2] 中的代码和 [3] 中的文档，当调用 prepare() 时，如果麦克风不可用，您应该得到一个 IOException:

recorder = new MediaRecorder();
recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
recorder.setOutputFile(path);
recorder.prepare();

[1] http://developer.android.com/resources/articles/speech-input.html
[2] http://developer.android.com/guide/topics/media/index.html#capture
[3] http://developer.android.com/reference/android/media/MediaRecorder.AudioSource.html