android-loader

What is the advantage of loaders over Asynctask in Android?

由 帅比萌擦擦* 提交于 2019-12-09 15:39:33
问题 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 ? 回答1: Yes, Loaders are more advantageous than

Pattern for using dynamic loaders to load ListView pages in a ViewPager without ListFragments?

由 折月煮酒 提交于 2019-12-08 08:21:00
问题 If I have a ViewPager with a certain number of pages, what would be the best way of loading the data for each page using the Loader framework? Each page contains a ListView with its own adapter instance. Use a separate loader for each page; or Use a single loader that checks which pages are not loaded and loads them The thing is, it's possible the user may want to quickly swipe through a bunch of pages and thus it should be easy to "cancel" loading pages that aren't needed for performance

How to interrupt AsyncTaskLoader's background thread?

由 删除回忆录丶 提交于 2019-12-07 09:36:36
问题 Is there some way to interrupt AsyncTaskLoader 's loadInBackground() thread when I call cancelLoad() ? I believe that AsyncTask.cancel() does this but the task variables are private and cannot be accessed. 回答1: Use stopLoading() or abandon() or reset() for that Article: https://plus.google.com/117981280628062796190/posts/8b9RmQvxudb 回答2: It's relatively simple to add that functionality, this is the Gist of it: public abstract class InterruptibleAsyncTaskLoader<D> extends AsyncTaskLoader<D> {

LoaderManager get data offline, then online

由 ╄→гoц情女王★ 提交于 2019-12-06 16:13:23
问题 I would like to follow this nice usability pattern, where app stores data offline for faster response and updates it when it gets new data online. And I use Loaders with LoaderManager . Now, what is the correct approach to implement the aforementioned approach with Loaders ? Currently I use two approaches, which have their downsides and, generally, are not very elegant. Storing the data in the application context instead of SQLite Two separate AsyncTaskLoaders - offlineLoader and onlineLoader

Accessing a Loader created in one fragment from another fragment

由 大城市里の小女人 提交于 2019-12-06 11:09:02
问题 I have an app with a fairly standard fragment layout. An expandable listview fragment on the left and a panel on the right that is used for different things depending on what the user chooses to do with the list on the left (displaying data, adding new data, etc). I'm using the LoaderManager (first time using loaders) with CommonWare's loaderex library as I have no need or desire to create a Content Provider for my database just so I can use a standard CursorLoader. This setup works great for

LoaderCallbacks.onLoadFinished() is not called after load finishes

由 余生长醉 提交于 2019-12-06 08:47:25
问题 I created a loader that descends from AsyncTaskLoader . It works 99% of the time, but there's an edge case where LoaderCallbacks.onLoadFinished() is not called after AsyncTaskLoader.loadInBackground() returns successfully. I don't know what's different in the edge case but I can't think of any reason why the loader would fail between these two calls. Is there anything I could be doing wrong? 回答1: First of all, it is important how you run your Loader: You can run it first time by activity

How to interrupt AsyncTaskLoader's background thread?

由 陌路散爱 提交于 2019-12-05 13:06:38
Is there some way to interrupt AsyncTaskLoader 's loadInBackground() thread when I call cancelLoad() ? I believe that AsyncTask.cancel() does this but the task variables are private and cannot be accessed. Use stopLoading() or abandon() or reset() for that Article: https://plus.google.com/117981280628062796190/posts/8b9RmQvxudb It's relatively simple to add that functionality, this is the Gist of it: public abstract class InterruptibleAsyncTaskLoader<D> extends AsyncTaskLoader<D> { private volatile Thread thread; public InterruptibleAsyncTaskLoader(Context context) { super(context); } public

Android TabsAdapter with ActionbarSherlock

由 被刻印的时光 ゝ 提交于 2019-12-05 12:36:50
I am using ActionbarSherlock with a SherlockListFragment that implements LoaderManager.LoaderCallbacks . In my ApplicationActivity onCreate method I am using setContentView(R.layout.application); to set the layout -- works great. I am initializing the actionbar like so ActionBar bar = getSupportActionBar(); bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); bar.setDisplayOptions(0, ActionBar.DISPLAY_SHOW_TITLE); bar.setDisplayHomeAsUpEnabled(false); bar.setDisplayShowTitleEnabled(true); // users event list bar.addTab(bar.newTab() .setTag("event_list") .setText(getString(R.string.list

Proper notification of AsyncTaskLoader about data changes from background thread

由 ╄→гoц情女王★ 提交于 2019-12-05 01:15:39
问题 I want to implement AsyncTaskLoader for my custom data source: public class DataSource { public interface DataSourceObserver { void onDataChanged(); } ... } DataSource will keep list of registered observers and will notify them about changes. CustomLoader will implement DataSourceObserver . The question is how to properly notify CustomLoader since Loader.onContentChanged() must be called from UI thread but in my case DataSource operations (and calls to DataSourceObserver.onDataChanged() )

LoaderManager get data offline, then online

由 ￣綄美尐妖づ 提交于 2019-12-04 21:07:18
I would like to follow this nice usability pattern, where app stores data offline for faster response and updates it when it gets new data online. And I use Loaders with LoaderManager . Now, what is the correct approach to implement the aforementioned approach with Loaders ? Currently I use two approaches, which have their downsides and, generally, are not very elegant. Storing the data in the application context instead of SQLite Two separate AsyncTaskLoaders - offlineLoader and onlineLoader . The first fetches the data from SQLite database and shows it immediately if it's there and the
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