title: Is it possible to start an activity in onPostExecute?
body: <p>I need to change my LoginMechanism into an asynchTask, so that it wont throw a android.os.NetworkOnMainThreadException in SDK 4.x. Its not clear for me how I can start a new intent in this asynctask. I understand that the work will be done in the doInBackground-Method and this return result will be processed in the onPostExecute method. In this method I tried to start my new activity and my service but it shows me compiler errors</p>
  
  <pre><code>The constructor Intent(MainActivity.LoginTask, Class&lt;AttachService&gt;) is undefined
  </code></pre>
  
  <p>and here is the onPostExecute Method</p>
  
  <pre><code>        @Override
      protected void onPostExecute(String result) {
          super.onPostExecute( result );
          if (result.equals("")){
              loginError.setText(R.string.login_error);
              loginError.setVisibility(View.VISIBLE);
          }
          else{
              loginError.setVisibility(View.INVISIBLE);
              startService(new Intent(LoginTask.this, AttachService.class));
              Log.d(TAG, "setting status of user " + login.getText().toString() + " to stored for service endpoint  " + service_endpoint_spinner.getSelectedItemId());
              if (appData.getLoggedInUser() == null){
                  loggedInUser = DBManager.getInstance().storeUser(user,hashedPw,target, true);
                  appData.setLoggedInUser(loggedInUser);
                  DBManager.getInstance().setUserStatusToStored(loggedInUser);
              }
              startActivity(new Intent(this, ActionActivity.class));          
          }
  
      }
  </code></pre>
  
  <p>All the startservice and startActivity methods produces compiler error, can someone explain why. 
  Thanks</p>