Geek asks and answers

Why is UtteranceProgressListener not an interface?

I play with Android TTS features, and the TextToSpeech class has this method for setting a listener that gets notified when TextToSpeech is finished playing:

public int setOnUtteranceCompletedListener(TextToSpeech.OnUtteranceCompletedListener listener)

But OnUtteranceCompletedListenerdefined as public abstract class. Since mine MainActivityalready extends Activity, it cannot extend as well OnUtteranceCompletedListener. I could use an older method with OnUtteranceCompletedListener, but this is deprecated:

public int setOnUtteranceCompletedListener (TextToSpeech.OnUtteranceCompletedListener listener)`

Why OnUtteranceCompletedListenernot defined how public static interface? I am going to write my own UtteranceProgressListenerImpl, which then simply calls the method MainActivity onDone. Is this right, or is there a better 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 */ }


}
+5
source share
1 answer

, , . , . .

.

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);
                }
            });
        }
    }
+7

More articles:


All Articles