How to know when Fragment becomes invisible

Question

I am using ViewPager with PagerSlidingTabStrip , i have 3 fragments , every fragment has its own custom listeners. In every fragment I overrided Destroy, Pause methods, but unfortunately when I move from one fragment to other I have to remove listeners of One fragment but none of the above methods are called as fragments remain in memory. These methods are only called when i am moving to another Activity. So can any body tell me how can I know if a fragment is going to made invisible so that I can remove Listeners, otherwise these listeners are going to disturb that data for all my fragments.

score 4 · Answer 1 · edited May 23 '17 at 12:09

4

I use this in my fragment, this is called twice. 1) when you go out of screen 2) when fragment is first created. TO solve check this link

@Override
    public void setUserVisibleHint(boolean visible){
        super.setUserVisibleHint(visible);
        if (!visible){
            //when fragment becomes invisible to user,do what you want...
        }
}

edited May 23 '17 at 12:09

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answered Apr 15 '15 at 08:01

Jemshit Iskenderov

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setUserVisibleHint method called each time when it is visible to a user. Not only for first time it been created. – Milon Feb 01 '17 at 11:55
@DinIslamMilon i didn't say that, read again. This particular code is called twice `if(!visible)`. – Jemshit Iskenderov Feb 01 '17 at 11:58

score 1 · Answer 2 · edited May 23 '17 at 12:09

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You should be using onPause() and onResume() as onDestroy() only gets called when the fragment is removed from memory, not when it stops being run.

Also, in a paging setup, neighbouring fragments will continue to run. One on either side of current fragment.

For the visibility check you could check this thread:

How to determine when Fragment becomes visible in ViewPager

edited May 23 '17 at 12:09

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answered Mar 07 '14 at 21:56

Cory Roy

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yes right , so how can i know which fragment is going to be invisible? – Ali Mar 07 '14 at 21:59
I updated my answer to include a reference to a similar problem. – Cory Roy Mar 07 '14 at 22:02

score 1 · Answer 3 · edited May 23 '17 at 12:34

1

With ViewPager you should better override Fragment.setUserVisibleHint() Fragment.onHiddenChanged() and react on visible/hidden state change. You still need to implement onPause() / onResume(). I explained it in this answer in more details.

edited May 23 '17 at 12:34

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answered May 16 '14 at 17:42

sergej shafarenka

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How to know when Fragment becomes invisible

3 Answers3