TextToSpeech OnUtteranceCompletedListener 导致延迟

Question

我需要 TextToSpeech 引擎一个接一个地说出我的话，并且我试图抓住一个单词的结束来开始说下一个单词。但是OnUtteranceCompletedListener 会导致语音延迟。 所以我的问题是，我该如何解决这个问题或更好地实现OnUtteranceCompletedListener？

public class AndroidTextToSpeechActivity extends Activity implements TextToSpeech.OnInitListener {

    int result = 0, CURRENT_WORD = 0;
    HashMap<String, String> myHash;
    String[] words;
    Button btnSpeak;
    TextToSpeech tts;
    Handler hand = new Handler();

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        text = "Hi there how are you";
        words = text.split(" ", 50);
        myHash = new HashMap<String, String>();
        tts = new TextToSpeech(this, this);

        btnSpeak = (Button) findViewById(R.id.btnSpeak);
        btnSpeak.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View arg0) {
                hand.postDelayed(run, 300);
            }
        });
    }

    @Override
    public void onInit(int status) {
        if (status == TextToSpeech.SUCCESS) {
            result = tts.setLanguage(Locale.getDefault());
            tts.setPitch(1f);
            tts.setSpeechRate(1f);
        } else
            Log.e("TTS", "Init failed");
    }

    Runnable run = new Runnable() {
        public void run() {
            text = words[CURRENT_WORD];
            tts.speak(text, 1, myHash);
            tts.setOnUtteranceCompletedListener(new OnUtteranceCompletedListener() {

                @Override
                public void onUtteranceCompleted(String utteranceId) {
                    CURRENT_WORD++;
                    hand.post(run1);
                }
            }); 
        }
    };

}

Answer 1

您可以通过不在每次运行中重新创建 OnUtteranceCompleteListener 来加快速度

OnUtteranceCompletedListener listener=new OnUtteranceCompletedListener(){
    @Override
    public void onUtteranceCompleted(String utteranceId) {
        CURRENT_WORD++;
        hand.post(run1);
    }
}
tts.setOnUtteranceCompletedListener(listener);
Runnable run = new Runnable() {
    public void run() {
        text = words[CURRENT_WORD];
        tts.speak(text, 1, myHash);
    }
};

此外，您可以使用 onUtteranceCompleted 方法调用 speak() 方法，而不是使用 Runnable 通过处理程序调用引擎的 speek() 方法

OnUtteranceCompletedListener listener=new OnUtteranceCompletedListener(){
    @Override
    public void onUtteranceCompleted(String utteranceId) {
        CURRENT_WORD++;
        if(CURRENT_WORD<max_words){
            String text=words[CURRENT_WORD];
            tts.speak(text,1,myHash);
        }
    }
}
tts.setOnUtteranceCompletedListener(listener);
Runnable run = new Runnable() {
    public void run() {
        text = words[CURRENT_WORD];
        tts.speak(text, 1, myHash);
    }
};

Answer 2

如果Locale.getDefault() 语言不受支持或需要数据文件，您的代码将失败。此外，如果在您按下btnSpeak 后，onInit() 没有返回 300 毫秒，speak() 将不起作用。 您应该在 xml 布局文件中禁用 btnSpeak 并在 onInit 中启用它。在btnSpeak listener 循环通过words 并调用speak()

btnSpeak = (Button) findViewById(R.id.btnSpeak);
    btnSpeak.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View arg0) {
            for (int i = 0; i < words.length; i++) {
                tts.speak(text, 1, myHash);
                // call playSilence (long durationInMs, 1, myHash) 
                // if you want a slight delay between each word.
            }
        }
    });