FragmentStatePagerAdapter: Don' t load all Tabs at the beginning

Question

In my Android app I use tabs with a FragmentStatePagerAdapter. I have many tabs, so it is a problem, that the FragmentStatePagerAdapter calls the onCreateView-method for all of them when the app starts. This is completely useless, because the method is called again, when I open a tab. Is there a way to prohibit that the onCreateView-method is called for all tabs at the beginning (It should only be called for the current tab and the tab left and right from it)?

Answer 1

that the FragmentStatePagerAdapter calls the onCreateView-method for all of them when the app starts

ViewPager will load 2-3 pages when it handed its PagerAdapter. Other pages will only be created when the user changes pages. ViewPager itself ensures that there is a page to either side of the current page (except for either end of the range of pages).

This is completely useless, because the method is called again, when I open a tab

onCreateView() will only be called when the fragment is created or when a configuration change occurs (e.g., screen rotation). FragmentStatePagerAdapter only hold onto a certain number of pages, so if the user swipes around a lot, FragmentStatePagerAdapter will discard existing fragments and, eventually, re-create them if the user returns to them in the future.

Is there a way to prohibit that the onCreateView-method is called for all tabs at the beginning

It already behaves this way by default.

For example, if you take this sample project, change it to use FragmentStatePagerAdapter, and add Log.e() calls to onCreateView() of the EditorFragment, you will see two onCreateView() calls when the ViewPager is initially displayed, plus an additional call on every swipe that requires a fragment instance to be created.