ViewPager call setUserVisibleHint after first Fragment is loaded

Question

In my application, I have a ViewPager which holds many swipeable Tabs with Fragments inside. I use the setUserVisibleHint method to detect when a Fragment comes to the screen. This works great when the user swipes between tabs but it does not work on the first load. To run the code in the method I have to swipe to left and then back to the first Fragment because the setUserVisibleHint method is called before the onCreateView method.

Do you have any ideas how I can run this code after the first Fragment is visible? Is there a method in the ViewPager or something else?

When I tried to do something similar (detect which of the fragments in the viewpager was the current visible page), I had this exact same problem. Every solution I tried was a hack and it was never quite right. — Karakuri, Sep 04 '14 at 14:43

score 66 · Accepted Answer · edited May 02 '16 at 21:21

66

You can't (and shouldn't) rely on setUserVisibleHint for this. Instead, you should be using a ViewPager.OnPageChangeListener to get callbacks for when a page becomes visible. E.g.

viewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
    @Override
    public void onPageSelected(int position) {
        // do your work
    } 
});

Note: You can use ViewPager.SimpleOnPageChangeListener if you don't need to listen for all callbacks.

Update

setOnPageChangeListener method is now deprecated, use addOnPageChangeListener instead

viewPager.addOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
    @Override
    public void onPageSelected(int position) {
        // do your work
    } 
});

edited May 02 '16 at 21:21

rsjaffe

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answered Sep 13 '14 at 11:37

Paul Burke

25,496
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if you want to recreate actionbar menu when fragment changed you should implement it onpagechangelistener like @paul says. – savepopulation Nov 04 '14 at 09:51
Thank you. Sometimes onCreateView and setUserVisibleHint called out of other... This method ensures after both have been called. – ilovett Feb 08 '15 at 00:44
12

Paul : How can I get this working the first time for the first page? – Arjun Mathew Dan Sep 25 '15 at 06:10
1

use `addOnPageChangeListener` instead of `setOnPageChangeListener` http://stackoverflow.com/a/30867886/1815624 – CrandellWS May 02 '16 at 19:58
1

Agreed this doesn't work at all for the first page loaded – AngryDuck Jan 18 '19 at 15:55

Rahul · Answer 2 · 2018-06-29T08:20:28.447

4

BELOW WORKED FOR ME

Please create a global view like this

View view;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState)
    {
        //inflate view layout
        view =inflater.inflate(R.layout.your_fragment, container, false);

        // return view
        return view;
    }

and use this

 @Override
        public void setUserVisibleHint(boolean isUserVisible)
        {
            super.setUserVisibleHint(isUserVisible);
           // when fragment visible to user and view is not null then enter here.
                if (isUserVisible && view != null)
                {
                   onResume();
                }

        }

and In OnResume method

@Override
         public void onResume() { 
         super.onResume();   
            if (!getUserVisibleHint()) {
            return;
          }
      //do your stuff here
   }

edited Jun 29 '18 at 08:20

answered Mar 13 '17 at 17:42

Rahul

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why downvote?? if anyone find any issue with it please let me know – Rahul Sep 17 '18 at 13:39
maybe because using global variables? – Jose_GD Dec 20 '18 at 19:08
@Jose_GD what is the problem with global variables?? – Rahul Dec 21 '18 at 05:13
See this comment: https://stackoverflow.com/questions/9779397/detect-viewpager-tab-change-inside-fragment#comment50489740_9779971 – Coli Jan 15 '20 at 13:07

score 3 · Answer 3 · answered Sep 12 '14 at 11:13

3

You have to call manually mViewPagerListener.onPageSelected(0); in onCreateView in your root activity/fragment.

answered Sep 12 '14 at 11:13

Yuraj

3,185
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score 0 · Answer 4 · answered Sep 09 '14 at 05:41

0

I dont understand what you need exactly but you can detect the page of the current fragment by calling ViewPager.getCurrentItem that return integer.

Hope it helps.

Good luck.

answered Sep 09 '14 at 05:41

Emre Aktürk

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score -1 · Answer 5 · answered Jun 12 '17 at 14:30

Well, its workaround more, and maybe its better to setup OnPageChangeListener, but it works for me. The task is to determine whether the current fragment is visible at creation. You can use the menu to do this. In your fragment:

 @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setHasOptionsMenu(true); // set current fragment has its own options menu
    }

and this

 @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
     ...

            if(isMenuVisible()) { // menu should be visible if current fragment is visible right now
                setUserVisibleHint(true); // manually set value to true
            }
     ...
    return view;

Maybe someone will find it usefull. This works for me.

score -6 · Answer 6 · answered Jan 23 '15 at 05:11

-6

I check your problem，but I find out the onCreateView method is called before the setUserVisibleHint method

enter code here

because the setUserVisibleHint method is called before the onCreateView method

answered Jan 23 '15 at 05:11

chinaanihchen

396
2
5

ViewPager call setUserVisibleHint after first Fragment is loaded

6 Answers6

Update

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