来自Android应用的谷歌文字转语音API [英] Google's Text-To-Speech API from Android app

问题描述

我想在Android应用中使用Google的文字转语音API，但我只能从网络（Chrome）中找到解决方法。这是我第一次尝试从应用程序中播放Hello world。

I want to use Google's Text-To-Speech API in an Android app but I only could find the way to do it from web (Chrome). This is my first attempt to play "Hello world" from the app.

playTTS 是onClick，它是已执行，但没有播放声音。我需要导入任何JS / Java库吗？是否可以从中生成音频文件？

playTTS is the onClick and it is been executed, but no sound is played. Is there any JS/Java library I need to import? Is it possible to generate an audio file from it?

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    myBrowser = new WebView(this);
    if (savedInstanceState == null) {
        getSupportFragmentManager().beginTransaction()
                .add(R.id.container, new PlaceholderFragment()).commit();
    }
}

public void playTTS(View view) {
    myBrowser.loadUrl("javascript:speechSynthesis.speak(
         SpeechSynthesisUtterance('Hello World'))");
}

推荐答案

在Android的java代码中你的活动/其他类应实现 TextToSpeech.OnInitListener 。您将通过调用 TextToSpeech（context，this）获得 TextToSpeech 实例。 （其中 context 指的是你的应用程序的上下文 - 在一个Activity中可以这个。）然后你会收到一个 onInit（）回调 status ，它告诉TTS引擎是否可用。

In Android java code your Activity/other Class should implement TextToSpeech.OnInitListener. You will get a TextToSpeech instance by calling TextToSpeech(context, this). (Where context refers to your application's Context -- can be this in an Activity.) You will then receive a onInit() callback with status which tells whether the TTS engine is available or not.

您可以通过调用 tts.speak（textToBeSpoken，TextToSpeech.QUEUE_FLUSH，null）或 tts.speak（textToBeSpoken， TextToSpeech.QUEUE_ADD，null）。第一个将中断任何仍在讲话的话语，后者将把新的话语添加到队列中。最后一个参数不是必需的。如果您想通过设置 UtteranceProgressListener 来监控TTS状态，它可能是您定义的话语ID。 （没必要）

You can talk by calling tts.speak(textToBeSpoken, TextToSpeech.QUEUE_FLUSH, null) or tts.speak(textToBeSpoken, TextToSpeech.QUEUE_ADD, null). The first one will interrupt any "utterance" that is still being spoken and the latter one will add the new "utterance" to a queue. The last parameter is not mandatory. It could be an "utterance id" defined by you in case you want to monitor the TTS status by setting an UtteranceProgressListener. (Not necessary)

在Java代码中，一个简单的TTS talker类可能是这样的：

In Java code a simple "TTS talker" class could be something like:

public class MyTtsTalker implements TextToSpeech.OnInitListener {

  private TextToSpeech tts;
  private boolean ttsOk;

  // The constructor will create a TextToSpeech instance.
  MyTtsTalker(Context context) {
    tts = new TextToSpeech(context, this);
  }

  @Override
  // OnInitListener method to receive the TTS engine status
  public void onInit(int status) {
    if (status == TextToSpeech.SUCCESS) {
      ttsOk = true;
    }
    else {
      ttsOk = false;
    }
  }

  // A method to speak something
  @SuppressWarnings("deprecation") // Support older API levels too.
  public void speak(String text, Boolean override) {
    if (ttsOk) {
      if (override) {
        tts.speak(text, TextToSpeech.QUEUE_FLUSH, null);    
      }    
      else {
        tts.speak(text, TextToSpeech.QUEUE_ADD, null);    
      }
    }
  }
}

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