What is ListActivity class used for?
ListActivity is a subclass of Activity that includes a ListView object. Through ListActivity class you can create an activity in your Android application that can be connected to different data sources (query cursor or arrays) and can be displayed as a set of list items on the screen.
What is the use of LoaderManager?
This helps an application manage longer-running operations in conjunction with the Activity or Fragment lifecycle; the most common use of this is with a CursorLoader , however applications are free to write their own loaders for loading other types of data. While the LoaderManager API was introduced in Build.
What is a ListActivity?
An activity that displays a list of items by binding to a data source such as an array or Cursor, and exposes event handlers when the user selects an item. ListActivity hosts a ListView object that can be bound to different data sources, typically either an array or a Cursor holding query results.
What are Android loaders?
Introduced in Android 3.0, loaders make it easy to asynchronously load data in an activity or fragment. They provide asynchronous loading of data. They monitor the source of their data and deliver new results when the content changes.
What are exceptions of Android?
Exception
| AccountsException | |
|---|---|
| AclNotFoundException | This is an exception that is thrown whenever a reference is made to a non-existent ACL (Access Control List). |
| AndroidException | Base class for all checked exceptions thrown by the Android frameworks. |
| AppSearchException | An exception thrown by AppSearchSession or a subcomponent. |
When onLoadFinished is called?
onLoadFinished(Loader loader, D data) Called when a previously created loader has finished its load. abstract void. onLoaderReset(Loader loader) Called when a previously created loader is being reset, and thus making its data unavailable.
What is the importance of loader in Android programming?
Loaders run on separate threads to prevent janky or unresponsive UI. Loaders simplify thread management by providing callback methods when events occur. Loaders persist and cache results across configuration changes to prevent duplicate queries.
What do you need to know about the loadermanager?
Simply stated, the LoaderManager is responsible for managing one or more Loader s associated with an Activity or Fragment. Each Activity and each Fragment has exactly one LoaderManager instance that is in charge of starting, stopping, retaining, restarting, and destroying its Loaders.
When does the loadermanager call the onloadfinished method?
The LoaderManager will call this method when it first creates the Loader. onLoadFinished is called automatically when a Loader has finished its load. This method is typically where the client will update the application’s UI with the loaded data.
Who is in charge of the loadermanager in Android?
Each Activity and each Fragment has exactly one LoaderManager instance that is in charge of starting, stopping, retaining, restarting, and destroying its Loaders. These events are sometimes initiated directly by the client, by calling initLoader () , restartLoader (), or destroyLoader ().
How to use listfragment instead of listactivity?
I’m using a ListFragment instead of a ListActivity (as in the example), so I have the ListFragment implement LoaderManager.LoaderCallbacks instead. Then, in the fillData () method in the ListFragment:
https://www.youtube.com/watch?v=4GP9o1qjT_k
