CODEWITHSUNDEEP
androidandroid-layoutandroid-fragmentsandroid-tabs
Mehdi Fanai
Mehdi Fanai

Reputation: 4059

how to avoid onCreateView() when swiping in tabs

I have an application with an activity and 3 swipable tabs(fragments). I have some heavily created UI elements inside tabs which take some time to be created and it's ok for the first run, but the views are recreated every time I swipe them.

When I select a tab, the other tab calls onStop() and when I select the previous tab again,onCreateView() is called again and view is repopulated which slows down and blocks UI thread.

What is the correct way to create fragments inside tabs ONCE and avoid recreating their view when swiping between other tabs?

Upvotes: 6

Views: 3817

Answers (3)

Vinil Chandran
Vinil Chandran

Reputation: 1561

Just add the following code inside main Fragment/Activity class where TabAdapter declared.

viewPager.setOffscreenPageLimit(tabLayout.getTabCount());

The tabLayout and viewPager as follows

TabLayout tabLayout = (TabLayout) root.findViewById(R.id.tab_layout);
ViewPager viewPager = (ViewPager) root.findViewById(R.id.pager);

Upvotes: 0

daniel_c05
daniel_c05

Reputation: 11518

To add to what CommnosWare stated, if you are using a view pager, you can simply call mViewPager.setOffscreenPageLimit(3); to keep all three in memory. But if your UI is too heavy, you may notice some jank. So try revising your UI setup code.

Upvotes: 16

CommonsWare
CommonsWare

Reputation: 1006819

I have some heavily created UI elements inside tabs which take some time to be created

If "some time" is more than ~5 milliseconds, your app is broken and needs to be fixed. Use Traceview to determine precisely where you are spending your time, then repair matters so that it takes less time on the main application thread.

What is the correct way to create fragments inside tabs ONCE and avoid recreating their view when swipping between other tabs?

AFAIK, FragmentPagerAdapter should not have the effect that you are describing (though FragmentStatePagerAdapter will). But, again, if you fix your onCreateView() performance issue, even FragmentStatePagerAdapter will not post a problem.

Upvotes: 2

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