Question

I’ve a FragmentPagerAdapter and I switch between ActionBarSherlock Tabs. When switching between Tabs, I hide one Fragment and Display another Fragment.

Now I’ve a question about the memory consumation, how the FragmentManager Releases the Fragments, if I hide it?
When there are more Fragments in it, is it possible to manually remove a Fragment Object from memory?

if I detach a Fragment, the Object is saved, if I remove a Fragment it is only removed from the View, if I set the Fragment = null, then the Fragment is not released, I always get a Fragment: myActivity.getSupportFragmentManager().findFragmentByTag(myTag);

Can someone explain me how the FragmentManager releases the Views, if it is neccessary and how I can realize that?

Answer 1

From android documentation.

Implementation of PagerAdapter that represents each page as a Fragment that is persistently kept in the fragment manager as long as the user can return to the page.

So if You are worried about memory issues don’t use FragmentPagerAdapter, I would advice you to use FragmentStatePagerAdapter instead.

In FragmentStatePagerAdapter when pages are not visible to the user,
their entire fragment may be destroyed, only keeping the saved state
of that fragment. This allows the pager to hold on to much less memory
associated with each visited page as compared to FragmentPagerAdapter
at the cost of potentially more overhead when switching between pages.

FragmentStatePagerAdapter works somewhat like a listview and is more efficient in terms of memory.