安卓语音识别(SpeechRecognizer)中的onReadyForSpeech()永远不会被调用

Question

这是我的代码：

@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_create_route);
SetupButton();
}
private void SetupButton()
{
Button createNewMessage = (Button) findViewById(R.id.button);
createNewMessage.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ListenForNewMessage();
}
});
}
private void ListenForNewMessage()
{
final SpeechRecognizer newDeliverySpeech = SpeechRecognizer.createSpeechRecognizer(this);
RecognitionListener newDeliveryRecognitionListener = new RecognitionListener() {
@Override
public void onReadyForSpeech(Bundle params) {
Log.d("SpeechListening","onReadyForSpeech");
}
@Override
public void onBeginningOfSpeech() {
Log.d("SpeechListening","onBeginningOfSpeech");
}
@Override
public void onRmsChanged(float rmsdB) {
//do nothing
}
@Override
public void onBufferReceived(byte[] buffer) {
//do nothing
}
@Override
public void onEndOfSpeech() {
Log.d("SpeechListening","onEndOfSpeech");
}
@Override
public void onError(int error) {
//do nothing
}
@Override
public void onResults(Bundle results) {
ArrayList<String> userMessage;
userMessage = results.getStringArrayList(RESULTS_RECOGNITION);
PushNewDelivery(userMessage);
}
@Override
public void onPartialResults(Bundle partialResults) {
//do nothing
}
@Override
public void onEvent(int eventType, Bundle params) {
//do nothing
}
};
newDeliverySpeech.setRecognitionListener(newDeliveryRecognitionListener);
if (newDeliverySpeech.isRecognitionAvailable(getApplicationContext()))
{
Log.d("SpeechListening","started listening hopefully");
newDeliverySpeech.startListening(new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH));
}
}

}

问题是，只有开始侦听(希望被记录)，RecognitionListener从未调用过onReadyForSpeech()或其任何方法。

详细信息详细信息详细信息详细信息有人能告诉我我在这里做错了什么吗？

Answer 1

您基本上是在创建一个新的SpeechRecognizer对象，并在每次单击按钮时注册一个新侦听器。最重要的是，您使用当前的活动上下文创建SpeechRecognizer，但在调用isRecognitionAvailable()时实际上使用的是应用程序上下文；

尝试将SpeechRecognizer创建为成员对象，并在调用onCreate()时注册侦听器。还要尽量避免使用应用程序上下文来避免内存泄漏。

这里有一个你应该怎么做的例子

private SpeechRecognizer mDeliverySpeech;
private Intent mSpeechIntent;
private boolean mListening = false;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_create_route);
SetupButton();
SetupSpeechRecognizer();
mSpeechIntent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
mSpeechIntent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_PREFERENCE, "en");
mSpeechIntent.putExtra(RecognizerIntent.EXTRA_CALLING_PACKAGE, this.getPackageName());
mSpeechIntent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
mSpeechIntent.putExtra(RecognizerIntent.EXTRA_MAX_RESULTS, 3);
}
private void SetupButton()
{
Button createNewMessage = (Button) findViewById(R.id.button);
createNewMessage.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ListenForNewMessage();
}
});
}
private void SetupSpeechRecognizer() 
{
mDeliverySpeech = SpeechRecognizer.createSpeechRecognizer(this);
RecognitionListener newDeliveryRecognitionListener = new RecognitionListener() {
@Override
public void onReadyForSpeech(Bundle params) {
Log.d("SpeechListening","onReadyForSpeech");
}
@Override
public void onBeginningOfSpeech() {
Log.d("SpeechListening","onBeginningOfSpeech");
}
@Override
public void onRmsChanged(float rmsdB) {
//do nothing
}
@Override
public void onBufferReceived(byte[] buffer) {
//do nothing
}
@Override
public void onEndOfSpeech() {
Log.d("SpeechListening","onEndOfSpeech");
}
@Override
public void onError(int error) {
//do nothing
}
@Override
public void onResults(Bundle results) {
ArrayList<String> userMessage;
userMessage = results.getStringArrayList(RESULTS_RECOGNITION);
PushNewDelivery(userMessage);
}
@Override
public void onPartialResults(Bundle partialResults) {
//do nothing
}
@Override
public void onEvent(int eventType, Bundle params) {
//do nothing
}
};
mDeliverySpeech.setRecognitionListener(newDeliveryRecognitionListener);
}
private void ListenForNewMessage()
{   
if (mDeliverySpeech.isRecognitionAvailable(this) && !mListening)
{
Log.d("SpeechListening","started listening hopefully");
mListening = true;
mDeliverySpeech.startListening(mSpeechIntent);
new CountDownTimer(5000, 5000) {
public void onTick(long millisUntilFinished) {}
public void onFinish() {
mDeliverySpeech.stopListening();
mListening = false;
}
}.start();
}
}

使用监听器时，不要忘记正确处理活动生命周期，以避免内存泄漏。