java - 简单的 TextToSpeech 代码

Question

我想制作一个简单的 TextToSpeech 代码。我的代码在这里:

TextToSpeech tts = new TextToSpeech(this, this);
tts.setLanguage(Locale.US);
tts.speak("This is a Alert Application", TextToSpeech.QUEUE_ADD,null,null);

但是我收到了这个错误:

Error:(100, 28) error: no suitable constructor found for TextToSpeech(MainActivity,MainActivity)
constructor TextToSpeech.TextToSpeech(Context,OnInitListener,String) is not applicable
(actual and formal argument lists differ in length)
constructor TextToSpeech.TextToSpeech(Context,OnInitListener) is not applicable
(actual argument MainActivity cannot be converted to OnInitListener by method invocation conversion)

我错过了什么？我需要在代码中输入什么？

Answer 1

如果您允许您的线程 hibernate ，并且在 hibernate 之后调用 tts.speak()。如果是这样，此时查看您的代码，tts 似乎没有初始化并且为空，因此会因异常而崩溃。

这段代码应该可以防止异常，但是如果TTS引擎的初始化时间太长，那么你就不会说Loading了。另外，我猜 5 秒(顺便说一句，这是一段很长的时间) sleep 是为了让它得到初始化？

代码

   public class mainj extends Activity implements OnInitListener {

   private TextToSpeech myTTS;
   // status check code
   private int MY_DATA_CHECK_CODE = 0;

   @Override
   public void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.loadscreen);
   Intent checkTTSIntent = new Intent();
   checkTTSIntent
     .setAction(TextToSpeech.Engine.ACTION_CHECK_TTS_DATA);
   startActivityForResult(checkTTSIntent, MY_DATA_CHECK_CODE);
   Thread logoTimer = new Thread() {
    public void run() {
        try {
            try {
                sleep(5000);
                speakWords("loading");
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            //waiting for the sleep
            splash_wait()

        }

        finally {
            finish();
        }
      }

    };
     logoTimer.start();
   }

  // speak the user text
  private void speakWords(String speech) {

     // speak straight away
     if(myTTS != null)
     {
    myTTS.speak(speech, TextToSpeech.QUEUE_FLUSH, null);
     }
    }

    // act on result of TTS data check
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

    if (requestCode == MY_DATA_CHECK_CODE) {
       if (resultCode == TextToSpeech.Engine.CHECK_VOICE_DATA_PASS) {
        // the user has the necessary data - create the TTS
        myTTS = new TextToSpeech(this, this);
    } else {
        // no data - install it now
        Intent installTTSIntent = new Intent();
        installTTSIntent
                .setAction(TextToSpeech.Engine.ACTION_INSTALL_TTS_DATA);
        startActivity(installTTSIntent);
       }
   }
}

 // setup TTS
 public void onInit(int initStatus) {

 // check for successful instantiation
 if (initStatus == TextToSpeech.SUCCESS) {
    if (myTTS.isLanguageAvailable(Locale.US) == TextToSpeech.LANG_AVAILABLE)
        myTTS.setLanguage(Locale.US);
  } else if (initStatus == TextToSpeech.ERROR) {
    Toast.makeText(this, "Sorry! Text To Speech failed...",
            Toast.LENGTH_LONG).show();
   }

    private void splash_wait() {
    new Handler().postDelayed(new Runnable() {
        @Override
        public void run() {

            Intent i = new Intent(SplashActivity.this, LoginActivity.class);
            startActivity(i);
            finish();
        }
    }, SPLASH_TIME_OUT);
}

}