在onResume之后，UtteranceProgressListener无法正常工作

Question

当我的应用程序首次安装或被销毁后打开时，它的效果很好。如果你退出并返回，那么UtteranceProgressListener中的onStart永远不会在OnInitListner中的onInit之后触发。当我在退出后打开应用程序时，其他一切似乎都在工作。日志显示调用onInit，但它永远不会进入UtteranceProgressListener中的onStart。我怎样才能做到这一点？

在我的onCreate中：

// Implement Text to speech feature
        tts = getTts();
        // set progress listener to the TTS engine
        tts.setOnUtteranceProgressListener(new UtteranceProgressListener() {

            @Override
            public void onStart(String utteranceId) {
                Log.d("LOOK AT ME!!!", "ttsUtteranceListener - onStart");

            }

            @Override
            public void onError(String utteranceId) {
                Log.d("LOOK AT ME!!!", "ttsUtteranceListener - onError");

            }

            @Override
            public void onDone(String utteranceId) {
                Log.d("LOOK AT ME!!!", "ttsUtteranceListener - onDone");
                if (processStarted) {
                    MainActivity.this.runOnUiThread(new Runnable() {

                        @Override
                        public void run() {
                            Log.d("LOOK AT ME!!!",
                                    "ttsUtteranceListener - speech,startListening");
                            speech.startListening(intent);
                        }
                    });
                } else {
                    ...
                }

                processStarted = false;
            }
        });

这里是“getTts（）”：

private TextToSpeech getTts() {

if (tts == null) {
    // Implement Text to speech feature
    tts = new TextToSpeech(this, new OnInitListener() {

        @Override
        public void onInit(int status) {
            Log.d("LOOK AT ME!!!", "ttsInitListener - onInit");

            if (status == TextToSpeech.SUCCESS) {
                tts.setLanguage(Locale.getDefault());

            } else {
                tts = null;
                Toast.makeText(MainActivity.this,
                        "Failed to initialize TTS engine.",
                        Toast.LENGTH_SHORT).show();
            }
        }
    });
}
return tts;
}

这是我的生命周期调用（onPause和onResume）：

// --- LIFECYCLE ---

@Override
public void onResume() {
    super.onResume();
    Log.d("LOOK AT ME!!!", "onResume");

    if (tts == null) {
    tts = getTts();
    }
}

@Override
public void onPause() {

    // Stop then shut down the TextToSpeech Engine
    if (tts != null) {
        tts.stop();
        tts.shutdown();

        tts = null;
    }

    super.onPause();
}