I have an navigation drawer Activity in which I have made 3 fragments using ViewPager. Each of the fragment has an edit Text, Image button and RecyclerView. The RecyclerView is getting data from a local SQLite database.
On opening the app, I get a Log trace that application skipped XX frames.
(Usually 30-50 frames). Is it normal ?
If not, then what should I do? Can fragments be made using background thread like AsyncTask? Or should I populate RecyclerView in background thread?
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Akshra Gupta
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do you use SQLite on the main thread? – Zun Jun 22 '18 at 07:23
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use `LoaderManager` to load content – Rahul Jun 22 '18 at 07:24
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The application is doing too much work in the main thread. move DB operations and other costly operations to background thread – Sarath Kn Jun 22 '18 at 07:25
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@ZUNJAE yes I am. – Akshra Gupta Jun 22 '18 at 08:07
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@SarathKn background thread like AsyncTask or is there something else also? – Akshra Gupta Jun 22 '18 at 08:08
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Don't do that then – Zun Jun 22 '18 at 08:08
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@RahulKumar LoaderManager is deprecated in API 28 – Akshra Gupta Jun 22 '18 at 08:09
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every action which performs reads or writes, or that is longer than 16 ms which doesn't require a UI update should be done in a background thread to prevent the app from freezing. – Zun Jun 22 '18 at 08:10
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@ZUNJAE won't I need to write the data on UI thread? – Akshra Gupta Jun 22 '18 at 08:17
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no? Why would you? – Zun Jun 22 '18 at 08:19
1 Answers
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Is it normal?
Nope. Check out Choreographer (start at line 619) if you are eager to find out what's happening behind the scenes.
what should I do? Can fragments be made using background thread like AsyncTask?
You can't do anything with Views on a background Thread since that would cause a CalledFromWrongThreadException, but what you definitely can and should do is moving all performance-heavy operations like DB read/write to worker Threads. Check out the AsyncTask and AsyncTaskLoader chapter from "Android Developer Fundamentals Course", it will give you a good start on background processing.
Also note that the LoaderManager from the support library is not deprecated.
Droidman
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