Question

我正在开发一个连接asp.net web服务的android应用程序..当我测试应用程序时显示响应

Android OS在网络主线程异常“。

我的代码

class GetDetails extends AsyncTask<String, String, String>
{
  @Override
  protected void onPreExecute() {
    super.onPreExecute();
    pDialog = new ProgressDialog(MainActivity.this);
    pDialog.setMessage("Loading the result... Please wait...");
    pDialog.setIndeterminate(false);
    pDialog.setCancelable(true);
    pDialog.show();
  }

  @Override
  protected String doInBackground(String... args)
  {
     try
     {
       runOnUiThread(new Runnable() {  
         @Override
         public void run() 
         {
           TextView webserviceResponse = (TextView) findViewById(R.id.textView1);
           webserviceResponse.setText("Requesting to server .....");

           //Create Webservice class object
           WebserviceCall com = new WebserviceCall(); 

           // Initialize variables
           String weight   = "18000";
           String fromUnit = "Grams";
           String toUnit   = "Kilograms";

           //Call Webservice class method and pass values and get response
           String aResponse = com.getConvertedWeight("ConvertWeight", weight, fromUnit, toUnit);   

           //Alert message to show webservice response
           Toast.makeText(getApplicationContext(), weight+" Gram= "+aResponse+" Kilograms", 
           Toast.LENGTH_LONG).show();

           Log.i("AndroidExampleOutput", "----"+aResponse);

           webserviceResponse.setText("Response : "+aResponse);
         }
       }
       );
     }

     finally  {
     }
     return null;
   }
}


protected void onPostExecute(String file_url) {
  // dismiss the dialog once got all details
  pDialog.dismiss();
}

}

Answer 1

将您的所有代码从runOnUiThread(new Runnable() {...}移至doInBackground(...)

由于runOnUiThread(..)代码在主线程中执行

还initialized Views Activity onCreate(..)中的class GetDetails extends AsyncTask<String, String, String> { @Override protected void onPreExecute() { super.onPreExecute(); pDialog = new ProgressDialog(MainActivity.this); pDialog.setMessage("Loading the result... Please wait..."); pDialog.setIndeterminate(false); pDialog.setCancelable(true); pDialog.show(); } @Override protected String doInBackground(String... args) { try { webserviceResponse.setText("Requesting to server ....."); //Create Webservice class object WebserviceCall com = new WebserviceCall(); // Initialize variables String weight = "18000"; String fromUnit = "Grams"; String toUnit = "Kilograms"; //Call Webservice class method and pass values and get response String aResponse = com.getConvertedWeight("ConvertWeight", weight, fromUnit, toUnit); Log.i("AndroidExampleOutput", "----"+aResponse); return aResponse; } } return null; } } protected void onPostExecute(String aResponse) { // dismiss the dialog once got all details pDialog.dismiss(); //Alert message to show webservice response Toast.makeText(getApplicationContext(), weight+" Gram= "+aResponse+" Kilograms", Toast.LENGTH_LONG).show(); webserviceResponse.setText("Response : "+aResponse); } }

正确：

var phone2 = ^(\+0?1\s)?\(?\d{3}\)?[\s.-]\d{3}[\s.-]\d{4}$;

Answer 2

在 doInBackground（）中，您编写了 runonUiThread（）方法。

在 runOnUIThread（）内部，您正在尝试进行网络通话。这就是为什么它提供 NetworkOnMainThreadException 。

将该网络电话放在 runOnUiThread（） 字符串aResponse = com.getConvertedWeight（＆＃34; ConvertWeight＆＃34;，weight，fromUnit，toUnit）; 但在里面 doInBackground（）我希望它能运作。

Answer 3

嗨使用处理程序更新UI。 处理程序示例

private Handler handler = new Handler(new Handler.Callback() {  @Override public boolean handleMessage(Message msg) {
    switch( msg.what ){
                case MSG:                       
                    progressDialog.show();
                    break;
                case DETACH:
                    progressDialog.dismiss();
                    break;  
            }
    return false; } });

在后台调用

Message m=Message.obtain();
 prepareMessage(m);
 handler.sendMessage(m);
public void prepareMessage(Message m)
    {
       Bundle b = new Bundle();
       b.putString("message", "Activity Done in background!!!!!!!");
       m.setData(b);

    }

网络主线程异常

3 个答案:

正确：