Databases
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PO
 

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    <p>Maybe you should consider reviewing your approach, the need you have for performing several updates depending on the view and cancel all the pending tasks from the previous views gives the impression that you are performing the load of data individually for every view that needs to be created.</p> <p>In a list view with a list adapter, the usual approach is to load a portion of the data (either as list of ValueObject or as Cursor from multiple database rows) paginated on demand or in one goal, not item by item. So if you wish to update the next page, you basically perform one single operation, either using AsyncTask or Loaders to fetch the new items to the model then making it available for the UI to display them. This way, you will be applying MVC, and you won't have several pending tasks to cancel and control, and your structure would be more solid and easier to manage.</p> <p>About the alternatives, If you're dealing with database, the most straightforward way is to use the CursorLoader, i.e. the <a href="https://developer.android.com/reference/android/content/Loader.html" rel="nofollow">loaders</a> instead of <a href="https://developer.android.com/reference/android/os/AsyncTask.html" rel="nofollow">AsyncTask</a>, but if you're dealing with data that comes from the network or filesystem, you're kinda free to choose from the variety of other options available. <a href="https://developer.android.com/reference/android/os/AsyncTask.html" rel="nofollow">AsyncTask</a> is much more simpler to use, mostly recommended for simple things or one shot queries. But you can also use Loaders for such tasks as well, see <a href="https://developer.android.com/reference/android/content/AsyncTaskLoader.html" rel="nofollow">AsyncTaskLoader</a>.</p>
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    1. POIs using AsyncTask still recommended for loading listView items in the background?
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    1. USAlécio Carvalho
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    1. COIf you load a lot of items at the same time, and don't show progress by displaying them, the user can think that it doesn't really load and will have to wait this whole time. Scrolling should put tasks on hold (or cancel them) as the items aren't shown anymore as new items should be shown.
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    2. COUnless if you show a progress bar for each item, e.g. like a download list, I still think you can do the updates in batch without degrading the user experience. Of course, you have to find a middle term, not load all the items at the same time, and also not load each of them individually. Find an amount that would make the UI responsive enough so the user notice the internal details.
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      1. USAlécio Carvalho
    3. COi think i can think of a way to do it using this idea, but maybe you have some kind of sample you could show me that does the same thing?
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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