無法摧毀Android的活動

我得到的，各國的應用程序無法破壞活動從JMDNSService.java無法摧毀Android的活動

private JMDNSService jmdnsService = null; 

@Override 
public void onDestroy() { 
    super.onDestroy(); 
    jmdnsService = null; // destroy this object so we don't keep polling. 
    if (D) {Log.i(TAG, "++++ ON DESTROY +++++"); } 
    try { 
     stopJMDNS(); 
    } catch (IOException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } 
    stopWifi(); 
} 

private void stopWifi() { 
    WifiManager wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE); 
    wifi.setWifiEnabled(false); 
} 

private void stopJMDNS() throws IOException { 
    jmdnsService.shutDownJmDNS(); 
}

代碼錯誤：

public boolean shutDownJmDNS(){ 
if(jmdns != null){ 
    try { 
     jmdns.close(); 
     } catch (IOException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
      return false; 
     } 
     return true; 
    } 
    return false; 
}

下面是從該logcat的輸出它正在生產：

01-11 19:19:54.528: E/AndroidRuntime(754): FATAL EXCEPTION: main 
01-11 19:19:54.528: E/AndroidRuntime(754): java.lang.RuntimeException: Unable to destroy activity {com.whooznear.android/com.whooznear.android.WhoozNearActivity}: java.lang.NullPointerException 
01-11 19:19:54.528: E/AndroidRuntime(754): at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:2950) 
01-11 19:19:54.528: E/AndroidRuntime(754): at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:2968) 
01-11 19:19:54.528: E/AndroidRuntime(754): at android.app.ActivityThread.access$1100(ActivityThread.java:122) 
01-11 19:19:54.528: E/AndroidRuntime(754): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1057) 
01-11 19:19:54.528: E/AndroidRuntime(754): at android.os.Handler.dispatchMessage(Handler.java:99) 
01-11 19:19:54.528: E/AndroidRuntime(754): at android.os.Looper.loop(Looper.java:132) 
01-11 19:19:54.528: E/AndroidRuntime(754): at android.app.ActivityThread.main(ActivityThread.java:4123) 
01-11 19:19:54.528: E/AndroidRuntime(754): at java.lang.reflect.Method.invokeNative(Native Method) 
01-11 19:19:54.528: E/AndroidRuntime(754): at java.lang.reflect.Method.invoke(Method.java:491) 
01-11 19:19:54.528: E/AndroidRuntime(754): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841) 
01-11 19:19:54.528: E/AndroidRuntime(754): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599) 
01-11 19:19:54.528: E/AndroidRuntime(754): at dalvik.system.NativeStart.main(Native Method) 
01-11 19:19:54.528: E/AndroidRuntime(754): Caused by: java.lang.NullPointerException 
01-11 19:19:54.528: E/AndroidRuntime(754): at com.whooznear.android.WhoozNearActivity.stopJMDNS(WhoozNearActivity.java:488) 
01-11 19:19:54.528: E/AndroidRuntime(754): at com.whooznear.android.WhoozNearActivity.onDestroy(WhoozNearActivity.java:447) 
01-11 19:19:54.528: E/AndroidRuntime(754): at android.app.Activity.performDestroy(Activity.java:4561) 
01-11 19:19:54.528: E/AndroidRuntime(754): at android.app.Instrumentation.callActivityOnDestroy(Instrumentation.java:1078) 
01-11 19:19:54.528: E/AndroidRuntime(754): at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:2937) 
01-11 19:19:54.528: E/AndroidRuntime(754): ... 11 more

由於某種原因，它不會讓我摧毀我的活動？任何想法都會有所幫助。

來源

2012-01-11 user268397

:-D

jmdnsService = null;

和幾行後：

jmdnsService.shutDownJmDNS();

你真的需要更多的解釋？

來源

2012-01-11 19:46:19

無法摧毀Android的活動

回答

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