通过语音启动语音识别，例如“Ok Google”？

我正在构建一个使用语音命令来执行某些功能的应用程序。我得到了一些代码here http://developer.android.com/training/wearables/apps/voice.html

private static final int SPEECH_REQUEST_CODE = 0;

// Create an intent that can start the Speech Recognizer activity
private void displaySpeechRecognizer() {
    Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
    intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,
            RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
// Start the activity, the intent will be populated with the speech text
    startActivityForResult(intent, SPEECH_REQUEST_CODE);
}

// This callback is invoked when the Speech Recognizer returns.
// This is where you process the intent and extract the speech text from the intent.
@Override
protected void onActivityResult(int requestCode, int resultCode,
        Intent data) {
    if (requestCode == SPEECH_REQUEST_CODE && resultCode == RESULT_OK) {
        List<String> results = data.getStringArrayListExtra(
                RecognizerIntent.EXTRA_RESULTS);
        String spokenText = results.get(0);
        // Do something with spokenText
    }
    super.onActivityResult(requestCode, resultCode, data);
}

然而，这种方法需要通过单击按钮来激活。有没有办法也通过语音命令启动语音识别器？就像 Google Now 一样，您只需说“Ok Google”，然后它就会打开语音识别器活动并监听命令？

Thanks.

您将需要编写一个用于连续语音识别的服务。并根据您在语音时获得的输入检测您的触发短语并采取行动。

这可能会占用大量内存，您需要通过在适当的时间和屏幕上启动和停止服务来进行优化。

接受的答案这个问题 https://stackoverflow.com/questions/18039429/android-speech-recognition-continuous-service提供了一种实现类似目标的方法。