为什么UtteranceProgressListener不是一个接口？ [英] Why is UtteranceProgressListener not an interface?

问题描述

我玩弄Android的TTS功能​​和TextToSpeech类有这个方法来设置一个监听器，得到通知，一旦TextToSpeech播放完毕：

 公众诠释setOnUtteranceCompletedListener（TextToSpeech.OnUtteranceCompletedListener监听器）
 

但 OnUtteranceCompletedListener 定义为公共抽象类。正如我的 MainActivity 已经扩展了活动，也不能延长 OnUtteranceCompletedListener 为好。我可以用一个 OnUtteranceCompletedListener 使用旧的方法，但是这是德precated：

 公众诠释setOnUtteranceCompletedListener（TextToSpeech.OnUtteranceCompletedListener监听）`
 

为什么 OnUtteranceCompletedListener 没有定义为公共静态接口？我想我自己写的 UtteranceProgressListenerImpl ，然后将只需要调用 MainActivity 取值 onDone 方法。这是正确的方式，或是否有更好/更清洁的替代方案？

 私有类UtteranceProgressListenerImpl扩展UtteranceProgressListener {

    私人MainActivity mainActivity;

    UtteranceProgressListenerImpl（MainActivity毫安）{
        mainActivity =毫安;
    }

    @覆盖
    公共无效onDone（字符串utteranceId）{
        mainActivity.onDone（utteranceId）;
    }

    @覆盖
    公共无效onerror的（字符串utteranceId）{/ *空* /}

    @覆盖
    公共无效ONSTART（字符串utteranceId）{/ *空* /}


}
 

解决方案

我不知道，我想它应该是一个界面，以及。我用这个code绕过它。它可<一个href="https://github.com/gast-lib/gast-lib/blob/master/library/src/root/gast/speech/voiceaction/VoiceActionExecutor.java"相对=nofollow>此处为好。

此外，投票给这个bug 我在不久前提交的。

 公共无效setTts（TextToSpeech TTS）
    {
        this.tts = TTS;
        如果（Build.VERSION.SDK_INT＆GT; = 15）
        {
            tts.setOnUtteranceProgressListener（新UtteranceProgressListener（）
            {
                @覆盖
                公共无效onDone（字符串utteranceId）
                {
                    onDoneSpeaking（utteranceId）;
                }

                @覆盖
                公共无效onerror的（字符串utteranceId）
                {
                }

                @覆盖
                公共无效ONSTART（字符串utteranceId）
                {
                }
            }）;
        }
        其他
        {
            Log.d（TAG，设置utternace完成监听器）;
            tts.setOnUtteranceCompletedListener（新OnUtteranceCompletedListener（）
            {
                @覆盖
                公共无效onUtteranceCompleted（字符串utteranceId）
                {
                    onDoneSpeaking（utteranceId）;
                }
            }）;
        }
    }
 

I'm playing around with Android's TTS features and the TextToSpeech class has this method to set a listener which gets notified once the TextToSpeech has finished playing:

public int setOnUtteranceCompletedListener(TextToSpeech.OnUtteranceCompletedListener listener)

But the OnUtteranceCompletedListener is defined as public abstract class. As my MainActivity already extends Activity, it can't extend OnUtteranceCompletedListener as well. I could use the older method with a OnUtteranceCompletedListener, but this is deprecated:

public int setOnUtteranceCompletedListener (TextToSpeech.OnUtteranceCompletedListener listener)`

Why is OnUtteranceCompletedListener not defined as public static interface? I'm thinking to write my own UtteranceProgressListenerImpl, which will then just call the MainActivitys onDone method. Is this the proper way or is there a better/cleaner alternative?

private class UtteranceProgressListenerImpl extends UtteranceProgressListener {

    private MainActivity mainActivity;

    UtteranceProgressListenerImpl(MainActivity mA) {
        mainActivity = mA;
    }

    @Override
    public void onDone(String utteranceId) {
        mainActivity.onDone(utteranceId);
    }

    @Override
    public void onError(String utteranceId) { /* empty */ }

    @Override
    public void onStart(String utteranceId) { /* empty */ }


}

解决方案

I don't know I think it should be an interface as well. I use this code to get around it. It is available here as well.

Also, vote for this bug I submitted a while ago.

public void setTts(TextToSpeech tts)
    {
        this.tts = tts;
        if (Build.VERSION.SDK_INT >= 15)
        {
            tts.setOnUtteranceProgressListener(new UtteranceProgressListener()
            {
                @Override
                public void onDone(String utteranceId)
                {
                    onDoneSpeaking(utteranceId);
                }

                @Override
                public void onError(String utteranceId)
                {
                }

                @Override
                public void onStart(String utteranceId)
                {
                }
            });
        }
        else
        {
            Log.d(TAG, "set utternace completed listener");
            tts.setOnUtteranceCompletedListener(new OnUtteranceCompletedListener()
            {
                @Override
                public void onUtteranceCompleted(String utteranceId)
                {
                    onDoneSpeaking(utteranceId);
                }
            });
        }
    }

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