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?

Answer 1

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     }  }); 

Answer 2

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    }