安卓文本到语音: onUtteranceCompleted()未触发

Question

我正在开发一个文本到语音的应用程序，onUtteranceCompleted从来不会被触发。下面是我的一些代码：

    public class MyActivity extends Activity implements OnInitListener, OnUtteranceCompletedListener {

        private TextToSpeech tts;
        private HashMap<String, String> hashAudio;

        public void onInit(int status) {
            if (status == TextToSpeech.SUCCESS) {

                //defining hashAudio, its music!
                this.hashAudio = new HashMap<String, String>();
                this.hashAudio.put(TextToSpeech.Engine.KEY_PARAM_STREAM, String.valueOf(AudioManager.STREAM_MUSIC));
                this.tts.setOnUtteranceCompletedListener(this);

                this.readEnglish();
            }
        }


    public void readEnglish(){
            Log.v("MESSAGE", "reading english"); //gets shown

            this.hashAudio.put(TextToSpeech.Engine.KEY_PARAM_UTTERANCE_ID, "english");
            this.tts.setLanguage(Locale.US);
            this.tts.speak("TEST", TextToSpeech.QUEUE_FLUSH, this.hashAudio);
           //gets read
        }

    public void onUtteranceCompleted(String uttId) {
            Log.v("MESSAGE", "Uterrance Completed");
            //never see this message
        }

有人知道为什么吗？我在这里介绍了一些主题和一些解决方案，但都没有奏效:(.我还仔细阅读了Android文档:(.

谢谢

Answer 1

好的，我自己想出来了，我代码中唯一的问题是

this.tts.setOnUtteranceCompletedListener(this);

在实例化Hashmap之后调用。因此，最终的代码应该如下所示：

this.tts.setOnUtteranceCompletedListener(this);
this.hashAudio = new HashMap<String, String>();
this.hashAudio.put(TextToSpeech.Engine.KEY_PARAM_STREAM,String.valueOf(AudioManager.STREAM_MUSIC));