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Are there any advantages of Loaders over Async task? Also, how to make loaders compatible for phones with Android froyo.
Edit:
The primary problem here is that I'm not using the native DB(SqlLite). Using the DB on development server. Obviously, I can't use CursorLoader any more. AsyncTaskLoader has no examples at all. If any, please do link.
Is it a better idea to load the data required onto the local DB and then query it using CursorLoader?
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AsyncTaskLoader is the loader equivalent of AsyncTask .
AsyncTask will be re-executed as background thread again, and previous background thread processing was just be redundant and zombie. AsyncTaskLoader will be just re-used basing on Loader ID that registered in Loader Manager before, so avoid re-executing network transaction.
Loaders persist and cache results across configuration changes to prevent duplicate queries. Loaders can implement an observer to monitor for changes in the underlying data source. For example, CursorLoader automatically registers a ContentObserver to trigger a reload when data changes.
1- Android AsyncTaskLoader AsyncTaskLoader is used to perform an asynchronous task in the background of the application, so the user can also interact with the application during that process. As soon as the task is completed, the result will be updated to the interface.
Android AsyncTask going to do background operation on background thread and update on main thread. In android we cant directly touch background thread to main thread in android development. asynctask help us to make communication between background thread to main thread.
However, AsyncTask is now deprecated and developers might sooner or later need an alternative for this. Through this article, we will show you 2 methods through which you can perform background tasks and simultaneously update the UI elements.
The naive AsyncTask implementation now has two threads trying to do the same update. So it is not the best pattern for a potentially very long running background operation , such as fetching from web services.
ProgressValue − It contains information about progress units. While doing background operation we can update information on ui using onProgressUpdate (). ResultValue −It contains information about result type. This example demonstrate about how to use asyncTask in android.
Yes, Loaders are more advantageous than AsyncTask as they take care of a lot of things that AsyncTask falls short of, miserably.
Screen Orientation changes are difficult in AsyncTask. I used to have such a problem, till I used an Activity Control class, which I used to retain while configuration changed. I can give you some code if you want to know how. The app used to crash, though, when you changed the orientation multiples times even before the entire data loaded. The secret here is not load a lot of data with your first thread and and finish your threading tasks as soon as possible. Even if it happens in the background, Android has a shabby way of dealing with threads. You never know when one of your tasks would be killed.
Even if you use a AsyncTaskLoader, makes sure that you use an Activity manager. This will help you in getting more control over the activites and AsyncTask.
Yes, it is compatible in all the old version of Android. You need to include the support library(Most of the times, this is included by default but its always nice to double check.)
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