Android NetworkOnMainThreadException異常

我在我的活動中有這個Networkonmainthread異常。我尋找解決問題的辦法。在我搜索時，我發現我應該使用AsyncTask。在我試過AsyncTask之後，我仍然面臨同樣的問題。Android NetworkOnMainThreadException異常

這是我的註冊活動：

private class MyAsyncTask extends AsyncTask<String, Void, JSONObject> { 

     protected JSONObject doInBackground(String... params) { 
      UserFunctions userFunction = new UserFunctions(); 
      if (params.length != 3) 
       return null; 
      JSONObject json = userFunction.registerUser(params[0], params[1], params[2]); 
      return json; 
     } 

     protected void onPostExecute(JSONObject json) { 
      // check for login response 
      try { 
       if (json != null && json.getString(KEY_SUCCESS) != null) { 
        registerErrorMsg.setText(""); 
        String res = json.getString(KEY_SUCCESS); 
        if(Integer.parseInt(res) == 1){ 
         // user successfully registred 
         // Store user details in SQLite Database 
         DatabaseHandler db = new DatabaseHandler(getApplicationContext()); 
         JSONObject json_user = json.getJSONObject("user"); 

         // Clear all previous data in database 
         UserFunctions userFunction = new UserFunctions(); 
         userFunction.logoutUser(getApplicationContext()); 
         db.addUser(json_user.getString(KEY_NAME), json_user.getString(KEY_EMAIL), json.getString(KEY_UID), json_user.getString(KEY_CREATED_AT));       
         // Launch Dashboard Screen 
         Intent dashboard = new Intent(getApplicationContext(), DashboardActivity.class); 
         // Close all views before launching Dashboard 
         dashboard.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 
         startActivity(dashboard); 
         // Close Registration Screen 
         finish(); 
        }else{ 
         // Error in registration 
         registerErrorMsg.setText("Error occured in registration"); 
        } 
       } 
      } catch (JSONException e) { 
       e.printStackTrace(); 
      } 
     } 
    } 




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

     // Importing all assets like buttons, text fields 
     inputFullName = (EditText) findViewById(R.id.registerName); 
     inputEmail = (EditText) findViewById(R.id.registerEmail); 
     inputPassword = (EditText) findViewById(R.id.registerPassword); 
     btnRegister = (Button) findViewById(R.id.btnRegister); 
     btnLinkToLogin = (Button) findViewById(R.id.btnLinkToLoginScreen); 
     registerErrorMsg = (TextView) findViewById(R.id.register_error); 

     // Register Button Click event 
     btnRegister.setOnClickListener(new View.OnClickListener() {   
      public void onClick(View view) { 
       String name = inputFullName.getText().toString(); 
       String email = inputEmail.getText().toString(); 
       String password = inputPassword.getText().toString(); 
       new MyAsyncTask().execute(name, email, password); 
       UserFunctions userFunction = new UserFunctions(); 
       JSONObject json = userFunction.registerUser(name, email, password); 

       // check for login response 
       try { 
        if (json.getString(KEY_SUCCESS) != null) { 
         registerErrorMsg.setText(""); 
         String res = json.getString(KEY_SUCCESS); 
         if(Integer.parseInt(res) == 1){ 
          // user successfully registred 
          // Store user details in SQLite Database 
          DatabaseHandler db = new DatabaseHandler(getApplicationContext()); 
          JSONObject json_user = json.getJSONObject("user"); 

          // Clear all previous data in database 
          userFunction.logoutUser(getApplicationContext()); 
          db.addUser(json_user.getString(KEY_NAME), json_user.getString(KEY_EMAIL), json.getString(KEY_UID), json_user.getString(KEY_CREATED_AT));       
          // Launch Dashboard Screen 
          Intent dashboard = new Intent(getApplicationContext(), DashboardActivity.class); 
          // Close all views before launching Dashboard 
          dashboard.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 
          startActivity(dashboard); 
          // Close Registration Screen 
          finish(); 
         }else{ 
          // Error in registration 
          registerErrorMsg.setText("Error occured in registration"); 
         } 
        } 
       } catch (JSONException e) { 
        e.printStackTrace(); 
       } 
      } 
     }); 

     // Link to Login Screen 
     btnLinkToLogin.setOnClickListener(new View.OnClickListener() { 

      public void onClick(View view) { 
       Intent i = new Intent(getApplicationContext(), 
         LoginActivity.class); 
       startActivity(i); 
       // Close Registration View 
       finish(); 
      } 
     }); 
    } 
}

這是我的logcat：

09-26 00:56:23.865: D/AndroidRuntime(791): Shutting down VM 
09-26 00:56:23.875: W/dalvikvm(791): threadid=1: thread exiting with uncaught exception (group=0x40a13300) 
09-26 00:56:23.925: E/AndroidRuntime(791): FATAL EXCEPTION: main 
09-26 00:56:23.925: E/AndroidRuntime(791): android.os.NetworkOnMainThreadException 
09-26 00:56:23.925: E/AndroidRuntime(791): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117) 
09-26 00:56:23.925: E/AndroidRuntime(791): at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84) 
09-26 00:56:23.925: E/AndroidRuntime(791): at libcore.io.IoBridge.connectErrno(IoBridge.java:127) 
09-26 00:56:23.925: E/AndroidRuntime(791): at libcore.io.IoBridge.connect(IoBridge.java:112) 
09-26 00:56:23.925: E/AndroidRuntime(791): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192) 
09-26 00:56:23.925: E/AndroidRuntime(791): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459) 
09-26 00:56:23.925: E/AndroidRuntime(791): at java.net.Socket.connect(Socket.java:842) 
09-26 00:56:23.925: E/AndroidRuntime(791): at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119) 
09-26 00:56:23.925: E/AndroidRuntime(791): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:144) 
09-26 00:56:23.925: E/AndroidRuntime(791): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164) 
09-26 00:56:23.925: E/AndroidRuntime(791): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119) 
09-26 00:56:23.925: E/AndroidRuntime(791): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360) 
09-26 00:56:23.925: E/AndroidRuntime(791): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555) 
09-26 00:56:23.925: E/AndroidRuntime(791): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487) 
09-26 00:56:23.925: E/AndroidRuntime(791): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465) 
09-26 00:56:23.925: E/AndroidRuntime(791): at library.JSONParser.getJSONFromUrl(JSONParser.java:45) 
09-26 00:56:23.925: E/AndroidRuntime(791): at library.UserFunctions.registerUser(UserFunctions.java:62) 
09-26 00:56:23.925: E/AndroidRuntime(791): at com.example.bustracker.RegisterActivity$1.onClick(RegisterActivity.java:105) 
09-26 00:56:23.925: E/AndroidRuntime(791): at android.view.View.performClick(View.java:4084) 
09-26 00:56:23.925: E/AndroidRuntime(791): at android.view.View$PerformClick.run(View.java:16966) 
09-26 00:56:23.925: E/AndroidRuntime(791): at android.os.Handler.handleCallback(Handler.java:615) 
09-26 00:56:23.925: E/AndroidRuntime(791): at android.os.Handler.dispatchMessage(Handler.java:92) 
09-26 00:56:23.925: E/AndroidRuntime(791): at android.os.Looper.loop(Looper.java:137) 
09-26 00:56:23.925: E/AndroidRuntime(791): at android.app.ActivityThread.main(ActivityThread.java:4745) 
09-26 00:56:23.925: E/AndroidRuntime(791): at java.lang.reflect.Method.invokeNative(Native Method) 
09-26 00:56:23.925: E/AndroidRuntime(791): at java.lang.reflect.Method.invoke(Method.java:511) 
09-26 00:56:23.925: E/AndroidRuntime(791): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
09-26 00:56:23.925: E/AndroidRuntime(791): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
09-26 00:56:23.925: E/AndroidRuntime(791): at dalvik.system.NativeStart.main(Native Method) 
09-26 00:56:24.215: W/System.err(791): org.apache.http.conn.HttpHostConnectException: Connection to http:// refused 
09-26 00:56:24.436: W/System.err(791): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:183) 
09-26 00:56:24.546: W/System.err(791): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164) 
09-26 00:56:24.786: W/System.err(791): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119) 
09-26 00:56:24.967: W/System.err(791): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360) 
09-26 00:56:24.995: W/System.err(791): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555) 
09-26 00:56:25.017: W/System.err(791): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487) 
09-26 00:56:25.017: W/System.err(791): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465) 
09-26 00:56:25.165: W/System.err(791): at library.JSONParser.getJSONFromUrl(JSONParser.java:45) 
09-26 00:56:25.235: W/System.err(791): at library.UserFunctions.registerUser(UserFunctions.java:62) 
09-26 00:56:25.264: W/System.err(791): at com.example.bustracker.RegisterActivity$MyAsyncTask.doInBackground(RegisterActivity.java:43) 
09-26 00:56:25.265: W/System.err(791): at com.example.bustracker.RegisterActivity$MyAsyncTask.doInBackground(RegisterActivity.java:1) 
09-26 00:56:25.285: W/System.err(791): at android.os.AsyncTask$2.call(AsyncTask.java:287) 
09-26 00:56:25.305: W/System.err(791): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305) 
09-26 00:56:25.535: W/System.err(791): at java.util.concurrent.FutureTask.run(FutureTask.java:137) 
09-26 00:56:25.535: W/System.err(791): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230) 
09-26 00:56:25.675: W/System.err(791): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076) 
09-26 00:56:25.956: W/System.err(791): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569) 
09-26 00:56:26.115: W/System.err(791): at java.lang.Thread.run(Thread.java:856) 
09-26 00:56:26.147: W/System.err(791): Caused by: java.net.ConnectException: failed to connect to /127.0.0.1 (port 8888): connect failed: ECONNREFUSED (Connection refused) 
09-26 00:56:26.226: W/System.err(791): at libcore.io.IoBridge.connect(IoBridge.java:114) 
09-26 00:56:26.226: W/System.err(791): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192) 
09-26 00:56:26.236: W/System.err(791): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459) 
09-26 00:56:26.236: W/System.err(791): at java.net.Socket.connect(Socket.java:842) 
09-26 00:56:26.246: W/System.err(791): at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119) 
09-26 00:56:26.255: W/System.err(791): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:144) 
09-26 00:56:26.255: W/System.err(791): ... 17 more 
09-26 00:56:26.266: W/System.err(791): Caused by: libcore.io.ErrnoException: connect failed: ECONNREFUSED (Connection refused) 
09-26 00:56:26.276: W/System.err(791): at libcore.io.Posix.connect(Native Method) 
09-26 00:56:26.286: W/System.err(791): at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:85) 
09-26 00:56:26.286: W/System.err(791): at libcore.io.IoBridge.connectErrno(IoBridge.java:127) 
09-26 00:56:26.286: W/System.err(791): at libcore.io.IoBridge.connect(IoBridge.java:112) 
09-26 00:56:26.296: W/System.err(791): ... 22 more 
09-26 00:56:26.296: E/Buffer Error(791): Error converting result java.lang.NullPointerException 
09-26 00:56:26.305: E/JSON Parser(791): Error parsing data org.json.JSONException: End of input at character 0 of 
09-26 00:56:27.146: I/Process(791): Sending signal. PID: 791 SIG: 9

我在做什麼錯？

來源

2014-09-25 user3675519

可能的[NetworkOnMainThread]重複（http://stackoverflow.com/questions/9745859/networkonmainthread） – Simon 2014-09-25 22:14:22

可能重複的[android.os.NetworkOnMainThreadException]（http://stackoverflow.com/questions/6343166/android- os-networkonmainthreadexception） – 2014-09-27 02:31:36

stacktrace表示您正在調用getJSONFromUrl()中的網絡操作並在UI線程在registerUser()。這裏的代碼看起來是罪魁禍首：

new MyAsyncTask().execute(name, email, password); 
UserFunctions userFunction = new UserFunctions(); 
JSONObject json = userFunction.registerUser(name, email, password);

你第一次調用在後臺的AsyncTask的registerUser()（好！），然後只有幾行後做同樣再次在主線程（壞了！）。刪除後者。

來源

2014-09-25 20:15:18 laalto

Thanks.network問題解決了。但現在我得到「http.conn.HttpHostConnectException：連接到http://127.0.0.1:8888拒絕」錯誤 – user3675519 2014-09-25 20:29:20

這是不太可能有一個web服務器運行在您的Android設備localhost 。 – laalto 2014-09-25 20:32:45

我敢打賭userFunction.logoutUser（getApplicationContext（））;發出網絡請求以註銷用戶因此在主線程上訪問網絡造成的錯誤（onPostResult在ui線程上運行，與doInBackground相反）

來源

2014-09-25 20:09:02 dominik4142

根據您的文章中的代碼，您仍然在調用MyAsyncTask.execute後直接從onClickListener處理程序內調用userFunction.registerUser。這是registerUser調用logcat輸出抱怨的，而不是AsyncTask中的。在將該邏輯移動到AsyncTask後，是否要刪除onClickListener處理程序中的重複調用？

來源

2014-09-25 20:16:12 eshayne

Android NetworkOnMainThreadException異常

回答

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