Android异步任务未到达onPostExecute

Question

我有一个Android应用程序正在使用异步任务来验证登录信息。 onpostexecute永远不会到达，我不能将@Override添加到它以使其运行。当我尝试@Override时，eclipse说它必须重载一个超类型的方法。这是代码。

public class UserLoginTask extends AsyncTask <LoginObject, Void, Boolean> 
{ 

    @Override 
    protected void onPostExecute(Boolean result) 
    { 
     // TODO Auto-generated method stub 
     super.onPostExecute(result); 
    } 

    @SuppressWarnings("finally") 
    @Override 
    protected Boolean doInBackground(LoginObject... params) 
    { 
     // TODO: attempt authentication against a network service. 
     HttpClient httpclient = new DefaultHttpClient(); 
     HttpPost httppost = new HttpPost("http://softeng.cs.uwosh.edu/students/cs342g6/login.php"); 
     Boolean response = false; 
     try 
     { 
      //Convert the login object to XML 
      XStream xstream = new XStream(new DomDriver("UTF-8")); 
      xstream.alias("Login", LoginObject.class); 
      String xml = xstream.toXML(login); 

      // Pass the XML as a StringEntity 
      StringEntity se = new StringEntity(xml,HTTP.UTF_8); 
      se.setContentType("text/xml"); 
      httppost.setEntity(se); 
      System.out.println("MADE IT TO RESPONSE"); 
      HttpResponse httpresponse = httpclient.execute(httppost); 
      HttpEntity resEntity = httpresponse.getEntity(); 
      String resp = EntityUtils.toString(resEntity); 
      System.out.println(resp); 
      response = convertToBool(resp); 
      if(response) 
       System.out.println("true"); 
      else 
       System.out.println("false"); 
     } 
     catch (ClientProtocolException e) 
     { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 
     catch (IOException e) 
     { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 
     return response; 
    } 
} 

protected void onPostExecute(Boolean success) 
{ 
    System.out.println("In onPostExecute"); 
    mAuthTask = null; 
    showProgress(false); 

    if (success) 
    { 
     finish(); 
    } 
    else 
    { 
     mPasswordView 
       .setError(getString(R.string.error_incorrect_password)); 
     mPasswordView.requestFocus(); 
    } 
} 

Answer 1

你有两个onPostExecute()动手清除一空，并确保做一些事情之一是的AsyncTask类中。

@Override 
protected void onPostExecute(Boolean result) 
{ 
    System.out.println("In onPostExecute"); 
    mAuthTask = null; 
    showProgress(false); 

    if (success) 
    { 
     finish(); 
    } 
    else 
    { 
     mPasswordView 
       .setError(getString(R.string.error_incorrect_password)); 
     mPasswordView.requestFocus(); 
    } 
}