如何查询默认的 SpeechRecognizer

Question

如何找出默认系统语音识别器的ComponentName，即调用createSpeechRecognizer(Context context)时返回的那个？ （其实我只需要找出它支持哪些输入语言，所以如果只有那个答案，那我也很感激。）

框架解决了这个问题

String serviceComponent = Settings.Secure.getString(mContext.getContentResolver(),
                        Settings.Secure.VOICE_RECOGNITION_SERVICE);

（见source code of SpeechRecognizer。）

但是，该解决方案似乎不适用于第三方应用。

Answer 1

但是，第三方应用似乎无法使用此解决方案。

我假设您得出这样的结论是因为Settings.Secure.VOICE_RECOGNITION_SERVICE 不是公共 API。但是，Settings.Secure.getString() 需要在安全表中查找第二个参数的行名。因此，您只需提供您要查找的行的实际名称："voice_recognition_service"。

也就是说，您可以使用与SpeechRecognizer 相同的代码，只需稍作改动：

String serviceComponent = Settings.Secure.getString(mContext.getContentResolver(),
        "voice_recognition_service");

希望这会有所帮助。

Answer 2

更新（我误读了原来的问题）

SpeechRecognizer 不是进行语音处理的东西，但是您传递给 SpeechRecognizer 的 Intent 是（通过startListening(Intent intent)）。该意图使用RecognizerIntent.ACTION_RECOGNIZE_SPEECH，并且可以以老式方式检测到AFAIK。

要检测默认值，请尝试解析您希望为其找到默认值但设置了PackageManager.MATCH_DEFAULT_ONLY 的 Intent。

未经测试的代码：

String detectDefaultSpeechRecognizer(Context context) {
  final Intent speechIntent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
  // 1: Try to find the default speech intent
  final ResolveInfo defaultResolution = context.getPackageManager().resolveService(speechIntent, PackageManager.MATCH_DEFAULT_ONLY);
  if (defaultResolution != null) {
    final ActivityInfo activity = defaultResolution.activityInfo;
    if (!activity.name.equals("com.android.internal.app.ResolverActivity")) {
      //ResolverActivity was launched so there is no default speech recognizer
      return "";
    }
  }
  // 2: Try to find anything that we can launch speech recognition with. Pick up the first one that can.
  final List<ResolveInfo> resolveInfoList = context.getPackageManager().queryIntentServices(speechIntent, PackageManager.MATCH_DEFAULT_ONLY);
  if (!resolveInfoList.isEmpty()) {
    speechIntent.setClassName(resolveInfoList.get(0).activityInfo.packageName, resolveInfoList.get(0).activityInfo.name);
    return resolveInfoList.get(0).activityInfo.packageName;
  }
  return "";
}

老答案

查看 GAST，它可以检查语音识别器是否支持某种语言。
https://github.com/gast-lib/gast-lib/blob/master/library/src/root/gast/speech/SpeechRecognizingActivity.java#L70

您也可以尝试手动检查<recognition-service> 元数据标签。 http://developer.android.com/reference/android/speech/RecognitionService.html#SERVICE_META_DATA

Answer 3

如果您只想了解默认系统语音识别器支持哪些输入语言 (createSpeechRecognizer (Context context))，有一种更直接的方法。

您需要做的就是使用RecognizerIntent.getVoiceDetailsIntent Intent 来检查默认的系统语音识别器语言：

Intent intent = RecognizerIntent.getVoiceDetailsIntent(getApplicationContext());

        if (intent != null) {
            ctx.sendOrderedBroadcast(intent, null, new BroadcastReceiver() {
                @Override
                public void onReceive(Context context, final Intent intent) {
                    Log.d(TAG,
                            "Receiving Supported Speech Recognition Languages broadcast "
                                    + intent);

                    final Bundle extra = getResultExtras(false);

                    if ((getResultCode() == Activity.RESULT_OK)
                            && (extra != null)
                            && (mHandler != null)
                            && ((extra
                                    .containsKey(RecognizerIntent.EXTRA_SUPPORTED_LANGUAGES)) || (extra
                                    .containsKey(RecognizerIntent.EXTRA_LANGUAGE_PREFERENCE)))) {

                        List<String> supportedLanguages = extra
                                .getStringArrayList(RecognizerIntent.EXTRA_SUPPORTED_LANGUAGES);
                        String prefLang = extra
                                .getString(RecognizerIntent.EXTRA_LANGUAGE_PREFERENCE);

                    }
                }

            },

            null, Activity.RESULT_OK, null, null);
        }