Configuration change in loader

Question

The one of the advantage of loaders over asynctask is that they can handle configuration change ie rotation.But I am not able to understand how they do this and what exactly this means.Can anyone give a suitable example for this?.

Thanks in advance

Answer 1

Suppose you use a CursorLoader to retrieve data from a ContentProvider.

Then, suppose the user rotates the screen from portrait to landscape. Your portrait activity will be destroyed, and a new instance of your activity will be created so that you can display your landscape UI.

The CursorLoader will not re-retrieve the data from the ContentProvider. Rather, your new activity instance will be handed back the same Cursor that had been delivered to your original activity instance.

Activity (for API Level 11+) and FragmentActivity (for API Level 10 and below) both will retain the CursorLoader and its Cursor across the configuration change. You can use a retained fragment (i.e., a fragment on which you call setRetainInstance(true)) to also retain arbitrary objects across configuration changes.

Answer 2

Loaders are more useful than asyntask in many cases of screen orientation and all.Coding is easy in loaders

You can see a detailed explanation here