ViewPager FragmentStatePagerAdapter keep more than three fragments in memory

Question

The problem is ive got sort of book reader, landscape shows two pages and portrait just one. For some reason I blocked destroying activities on config change. the story is pretty much the same like here ViewPager + FragmentStatePagerAdapter + orientation change. Although the question is bit different - Id wish to store not 3 but 5 fragments. its about rendering time, Im easily handling swipe stuffs with adding +-1 in portrait and +-2 in landscape, though the problem is, in landscape orientation, it wont render proper next / previous fragments. As obviously its rendering +1 and -1 items, I want +2/-2 items to be instantiated instead. So theres either some kind of solution that changes positions to instantiate in landscape (which im not aware of though), or storing 5 items in an adapter instead of just 3. Anyone with any sort of proper solution?

score 12 · Answer 1 · answered Dec 09 '13 at 11:08

12

You can store 5 items in the adapter by setting the OffscreenPageLimit of the ViewPager to 4:

viewPager.setOffscreenPageLimit(4);

hope that I've helped you.

answered Dec 09 '13 at 11:08

Nabz

390
2
14

thanks, though the performance dropped badly, what about rendering just +-2 element instead of +-1? – Maciej Boguta Dec 09 '13 at 11:26

score 2 · Answer 2 · answered Dec 09 '13 at 11:09

2

try this: mViewPager.setOffscreenPageLimit(4);

answered Dec 09 '13 at 11:09

Abhishek Shukla

1,242
8
11

thanks, though the performance dropped badly, what about rendering just +-2 element instead of +-1? – Maciej Boguta Dec 09 '13 at 11:26

ViewPager FragmentStatePagerAdapter keep more than three fragments in memory

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