SpeechRecognizer:未连接到识别服务

Question

在我的应用中,我直接使用SpeechRecognizer.我销毁SpeechRecognizer onPause的活动,我在onResume方法中重新创建它,如下所示...

public class NoUISpeechActivity extends Activity {

protected static final String CLASS_TAG = "NoUISpeechActivity";
private SpeechRecognizer sr;


@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_no_uispeech);

    sr = getSpeechRecognizer();
}

@Override
protected void onPause() {

    Log.i(CLASS_TAG, "on pause called");
    if(sr!=null){
        sr.stopListening();
        sr.cancel();
        sr.destroy();       

    }

    super.onPause();
}


@Override
protected void onResume() {

    Log.i(CLASS_TAG, "on resume called");       

    sr = getSpeechRecognizer();

    super.onResume();
}

....

private SpeechRecognizer getSpeechRecognizer() {
    if(sr == null){
        sr = SpeechRecognizer.createSpeechRecognizer(getApplicationContext());
        CustomRecognizerListner listner = new CustomRecognizerListner();
        listner.setOnListeningCallback(new OnListeningCallbackImp());
        sr.setRecognitionListener(listner);
    }
    return sr;
}
}

当应用程序首次通过eclipse安装时,会调用SpeechRecognition服务并正确识别.但是当应用程序从暂停状态恢复时,如果我尝试识别语音,我会收到"SpeechRecognition:not connect to recognition service"错误

我究竟做错了什么 ？

Answer 1

我找到了问题的原因.在onPause方法虽然SpeechRecognition.destroy()调用方法,我猜它只是分离服务但对象sr将指向一些实例,它不会为null.将对象重置sr为null可以解决问题.

不破坏方法中的SpeechRecognition对象onPause会阻止其他应用程序使用SpeechRecognition服务

@Override
protected void onPause() {

    Log.i(CLASS_TAG, "on pause called");
    if(sr!=null){
        sr.stopListening();
        sr.cancel();
        sr.destroy();              

    }
    sr = null;

    super.onPause();
}