NetworkOnMainThreadException雖然我看看我是否有互聯網連接

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我想檢查我的移動設備，寬帶上網，但我得到了以下錯誤：NetworkOnMainThreadException雖然我看看我是否有互聯網連接

08-13 14:20:48.990: E/AndroidRuntime(2546): FATAL EXCEPTION: main 
08-13 14:20:48.990: E/AndroidRuntime(2546): java.lang.RuntimeException: Unable to start activity ComponentInfo{cx.hell.android/cx.hell.android.conn.tryInternet}: android.os.NetworkOnMainThreadException 
08-13 14:20:48.990: E/AndroidRuntime(2546):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059) 
08-13 14:20:48.990: E/AndroidRuntime(2546):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) 
08-13 14:20:48.990: E/AndroidRuntime(2546):  at android.app.ActivityThread.access$600(ActivityThread.java:130) 
08-13 14:20:48.990: E/AndroidRuntime(2546):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195) 
08-13 14:20:48.990: E/AndroidRuntime(2546):  at android.os.Handler.dispatchMessage(Handler.java:99) 
08-13 14:20:48.990: E/AndroidRuntime(2546):  at android.os.Looper.loop(Looper.java:137) 
08-13 14:20:48.990: E/AndroidRuntime(2546):  at android.app.ActivityThread.main(ActivityThread.java:4745) 
08-13 14:20:48.990: E/AndroidRuntime(2546):  at java.lang.reflect.Method.invokeNative(Native Method) 
08-13 14:20:48.990: E/AndroidRuntime(2546):  at java.lang.reflect.Method.invoke(Method.java:511) 
08-13 14:20:48.990: E/AndroidRuntime(2546):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
08-13 14:20:48.990: E/AndroidRuntime(2546):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
08-13 14:20:48.990: E/AndroidRuntime(2546):  at dalvik.system.NativeStart.main(Native Method) 
08-13 14:20:48.990: E/AndroidRuntime(2546): Caused by: android.os.NetworkOnMainThreadException 
08-13 14:20:48.990: E/AndroidRuntime(2546):  at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117) 
08-13 14:20:48.990: E/AndroidRuntime(2546):  at java.net.InetAddress.lookupHostByName(InetAddress.java:385) 
08-13 14:20:48.990: E/AndroidRuntime(2546):  at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236) 
08-13 14:20:48.990: E/AndroidRuntime(2546):  at java.net.InetAddress.getAllByName(InetAddress.java:214) 
08-13 14:20:48.990: E/AndroidRuntime(2546):  at libcore.net.http.HttpConnection.<init>(HttpConnection.java:70) 
08-13 14:20:48.990: E/AndroidRuntime(2546):  at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50) 
08-13 14:20:48.990: E/AndroidRuntime(2546):  at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:341) 
08-13 14:20:48.990: E/AndroidRuntime(2546):  at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87) 
08-13 14:20:48.990: E/AndroidRuntime(2546):  at libcore.net.http.HttpConnection.connect(HttpConnection.java:128) 
08-13 14:20:48.990: E/AndroidRuntime(2546):  at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:315) 
08-13 14:20:48.990: E/AndroidRuntime(2546):  at libcore.net.http.HttpEngine.connect(HttpEngine.java:310) 
08-13 14:20:48.990: E/AndroidRuntime(2546):  at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:289) 
08-13 14:20:48.990: E/AndroidRuntime(2546):  at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:239) 
08-13 14:20:48.990: E/AndroidRuntime(2546):  at libcore.net.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:80) 
08-13 14:20:48.990: E/AndroidRuntime(2546):  at cx.hell.android.conn.tryInternet.executeReq(tryInternet.java:47) 
08-13 14:20:48.990: E/AndroidRuntime(2546):  at cx.hell.android.conn.tryInternet.onCreate(tryInternet.java:27) 
08-13 14:20:48.990: E/AndroidRuntime(2546):  at android.app.Activity.performCreate(Activity.java:5008) 
08-13 14:20:48.990: E/AndroidRuntime(2546):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079) 
08-13 14:20:48.990: E/AndroidRuntime(2546):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023) 
08-13 14:20:48.990: E/AndroidRuntime(2546):  ... 11 more

在我的應用程序，我需要檢查，如果該設備有互聯網連接，無論是通過WIFI或數據連接。所以我測試是否有與谷歌連接。不是，如果這種方法可能是我的問題的原因。這是我正在使用的代碼。

public class tryInternet extends Activity{ 
    String LOGTAG=""; 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

      //LOAD LIBRARY// 
      URL url; 
      try { 
       url = new URL("http://www.google.es"); 
       executeReq(url); 
       Intent intent = new Intent(tryInternet.this, MainActivity.class); 
       startActivity(intent); 
       finish(); 
      } catch (IOException e) { 
       Toast.makeText(getBaseContext(), "DON'T HAVE A CONNECTION OF INTERNET", 
         Toast.LENGTH_LONG).show(); 
      } 

    } 
    private void executeReq(URL urlObject) throws IOException{ 
     HttpURLConnection conn = null; 

     conn = (HttpURLConnection) urlObject.openConnection(); 
     conn.setReadTimeout(100000);//milliseconds 
     conn.setConnectTimeout(150000);//milliseconds 
     conn.setRequestMethod("GET"); 
     conn.setDoInput(true); 

     // Start connect 
     conn.connect(); 
     InputStream response = conn.getInputStream(); 
     String iS= "" + response; 
     Log.d("Response:", iS); 
    } 

}

有什麼想法嗎？ Thankss！

來源

2012-08-13 jlopez

在搜索上省力......以任何方式將連接檢查代碼放入'AsyncTask'中。並刪除這個問題..因此有很多問題已經可用於相同的主題。 – user370305 2012-08-13 12:43:43

我已經看到很多帖子出現這個問題，但是idk如果真的需要添加一個asynctask來解決這個問題 – jlopez 2012-08-13 12:46:44

'AsyncTask'沒有必要。但是您的網絡相關操作不應該在'MainUI線程'上。所以你可以使用線程，處理程序等。但主要規則是**不在MainUI線程**上。 – user370305 2012-08-13 12:48:17