我在我的程序語音識別器中有，當(dāng)我直接在 onCreate 方法中運行 startListening 方法時，語音識別器似乎不起作用。但是當(dāng)我在按鈕 onClick 方法中放置 startListening 方法時，語音識別器正在工作。我想直接調(diào)用語音識別器方法 startListening，如下面的程序所示。以下是我的程序。       SpeechRecognizer mSpeechRecognizer;Intent mSpeechRecognizerIntent;TextView textView;String speakId = "one";String oldId = "";@Overrideprotected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_robo);    textView = (TextView) findViewById(R.id.textView);    mSpeechRecognizer = SpeechRecognizer.createSpeechRecognizer(this);    mSpeechRecognizerIntent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);    mSpeechRecognizerIntent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,            RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);    mSpeechRecognizerIntent.putExtra(RecognizerIntent.EXTRA_LANGUAGE,            Locale.getDefault());    mSpeechRecognizer.setRecognitionListener(new RecognitionListener() {        @Override        public void onReadyForSpeech(Bundle params) {        }        @Override        public void onBeginningOfSpeech() {        }        @Override        public void onRmsChanged(float rmsdB) {        }        @Override        public void onBufferReceived(byte[] buffer) {        }        @Override        public void onEndOfSpeech() {        }        @Override        public void onError(int error) {        }        @Override        public void onResults(Bundle results) {            ArrayList<String> matches = results.getStringArrayList(SpeechRecognizer.RESULTS_RECOGNITION);            textView.setText(matches.get(0));            //displaying the first match            //if (matches != null)            //processResult(matches.get(0));        }但是當(dāng)我在按鈕 onClick 事件中調(diào)用 mSpeechRecognizer.startListening(mSpeechRecognizerIntent) 時，SpeechRecognizer 正在工作。    public void Listen(View view) {    mSpeechRecognizer.startListening(mSpeechRecognizerIntent);}為什么當(dāng)代碼放在 onCreate 方法中而不是在 onClick 方法中時不起作用。請告訴一個解決方案。