Question

After reading a few articles about Android configuration, I still don’t know how to NOT launch an async task when I change the view from portrait to landscape. I load some information from the server, and it will be not wise to load it every time I rotate my phone. I want to load it once. Can I do that without adding ‘changeConfig’ flag in Manifest file?

Answer 1

1 Make your AsyncTask a private instance variable of your class (has to be declared as a static inner class or as a separate file).

2 Return your AsyncTask instance in onRetainConfigurationChanges()

  public Object onRetainNonConfigurationInstance() {
      return yourAsyncTask;
  }

3 Retrieve it in oResume():

 public void onResume() {
   Object data = getLastNonConfigurationInstance();
   if (data != null) {
     ... // pass in your activity to the AsyncTask so it can update your views
   } else {
     ... // create new AsyncTask and spin it up.
   }
 }