![]() Some of the characteristics or features offered by Loaders are: Loaders solve this by doing the work on a worker thread and providing callbacks to the activities and fragments to respond to the asynchronous nature of data fetch. The second issue with loading data in activities and fragments is that data access could take longer on the main thread resulting in application-not-responding (ANR) messages. This mechanism is now discontinued in favor of Loaders. ![]() Prior to the introduction of Loaders, this was handled through Managed Cursors. Any code that retrieves data must work in harmony with the activity life cycle events. These events are called activity life cycle events. The first is the non-deterministic nature of activities where an activity can be hidden partially or fully, restarted due to device rotation, or removed from memory when in background due to low-memory conditions. So, the API of Loaders is designed to deal with two issues with loading data by activities and fragments. Loaders handles rotation better, it automatically reconnect to the last loader’s cursor when being recreated after a configuration change avoiding the need to re-query their data. ![]() ![]() If you rotate the device, you have to cancel the AsyncTask or the app will crash. I want to take a look at how Loaders could be used as a replacement for AsyncTask. It's primary usage is to work with a database utilizing the CursorLoader, but it can also be used to do other asynchronous tasks. It monitor the source of the data and automatically deliver new result when content changes. Exploring asynchronous data loading with Loaders in Android Android Īndroid introduced Loaders in 3.0 to ease asynchronous tasks on Activity and Fragments. ![]()
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