How to know if a Fragment is Visible

Question

I m using the support library v4 and my questions are  How to know if a Fragment is Visible  and How can I change the propierties of the Layout inflated in the Fragment  Thanks in advance   ---Edit---  I m using fragments like in the android developers tutorial with a FragmentActivity

User · Answer

Both isVisible   and isAdded   return true as soon as the Fragment is created  and not even actually visible  The only solution that actually works is  if  isAdded    amp  amp  isVisible    amp  amp  getUserVisibleHint                 do your thing    This does the job  Period  NOTICE  getUserVisibleHint   is now deprecated  be careful

User · Answer

getUserVisibleHint   comes as true only when the fragment is on the view and visible

User · Answer

ArticleFragment articleFrag    ArticleFragment              getSupportFragmentManager   findFragmentById R id article fragment        if  articleFrag    null  amp  amp  articleFrag isVisible                  Call a method in the ArticleFragment to update its content         articleFrag updateArticleView position           see http   developer android com training basics fragments communicating html

User · Answer

If you want to know when use is looking at the fragment you should use  yourFragment isResumed     instead of   yourFragment isVisible     First of all isVisible   already checks for isAdded   so no need for calling both  Second  non-of these two means that user is actually seeing your fragment  Only isResumed   makes sure that your fragment is in front of the user and user can interact with it if thats whats you are looking for

User · Answer

You can override setMenuVisibility like this    Override public void setMenuVisibility final boolean visible       if  visible            Do your stuff here          super setMenuVisibility visible

User · Answer

Try this if you have only one Fragment if  getSupportFragmentManager   getBackStackEntryCount      0                          TODO  Your Code Here

User · Answer

Adding some information here that I experienced  fragment isVisible is only working  true false  when you replaceFragment   otherwise if you work with addFragment    isVisible always returns true whether the fragment is in behind of some other fragment

User · Answer

None of the above solutions worked for me  The following however works like a charm - override fun setUserVisibleHint isVisibleToUser  Boolean

User · Answer

One thing to be aware of  is that isVisible   returns the visible state of the current fragment  There is a problem in the support library  where if you have nested fragments  and you hide the parent fragment  and therefore all the children   the child still says it is visible   isVisible   is final  so can t override unfortunately  My workaround was to create a BaseFragment class that all my fragments extend  and then create a method like so   public boolean getIsVisible         if  getParentFragment      null  amp  amp  getParentFragment   instanceof BaseFragment                return isVisible    amp  amp    BaseFragment  getParentFragment    getIsVisible              else               return isVisible              I do isVisible    amp  amp    BaseFragment  getParentFragment    getIsVisible    because we want to return false if any of the parent fragments are hidden   This seems to do the trick for me

User · Answer

Just in case you use a Fragment layout with a ViewPager  TabLayout   you can easily ask for the current  in front  fragment by ViewPager getCurrentItem   method  It will give you the page index  Mapping from page index to fragment class  should be easy as you did the mapping in your FragmentPagerAdapter derived Adapter already  int i   pager getCurrentItem     You may register for page change notifications by ViewPager pager    ViewPager  findViewById R id container   pager addOnPageChangeListener this    Of course you must implement interface ViewPager OnPageChangeListener public class MainActivity      extends AppCompatActivity     implements ViewPager OnPageChangeListener       public void onPageSelected  int position                   we get notified here when user scrolls switches Fragment in ViewPager -- so            we know which one is in front          Toast toast   Toast makeText this   quot current page  quot    String valueOf position   Toast LENGTH LONG           toast show               public void onPageScrolled  int position  float positionOffset  int positionOffsetPixels               public void onPageScrollStateChanged  int state             My answer here might be a little off the question  But as a newbie to Android Apps I was just facing exactly this problem and did not find an answer anywhere  So worked out above solution and posting it here -- perhaps someone finds it useful  Edit  You might combine this method with LiveData on which the fragments subscribe  Further on  if you give your Fragments a page index as constructor argument  you can make a simple amIvisible   function in your fragment class  In MainActivity  private final MutableLiveData lt Integer gt  current page ld   new MutableLiveData lt  gt     public LiveData lt Integer gt  getCurrentPageIdx     return current page ld     public void onPageSelected int position        current page ld setValue position      public class MyPagerAdapter extends FragmentPagerAdapter       public Fragment getItem int position               getItem is called to instantiate the fragment for the given page  But only on first            creation -- not on restore state                see  https   stackoverflow com a 35677363 3290848         switch  position                case 0                  return MyFragment newInstance 0               case 1                  return OtherFragment newInstance 1               case 2                  return XYFragment newInstance 2                     return null           In Fragment      public static MyFragment newInstance int index            MyFragment fragment   new MyFragment            Bundle args   new Bundle            args putInt  quot idx quot   index           fragment setArguments args           return fragment             public void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           if  getArguments      null                mPageIndex   getArguments   getInt ARG PARAM1                                        public void onAttach Context context                super onAttach context           MyActivity mActivity    MyActivity context           mActivity getCurrentPageIdx   observe this  new Observer lt Integer gt                   Override             public void onChanged Integer data                    if  data    mPageIndex                           have focus                   else                          not in front

User · Answer

You should be able to do the following   MyFragmentClass test    MyFragmentClass  getSupportFragmentManager   findFragmentByTag  testID    if  test    null  amp  amp  test isVisible             DO STUFF   else         Whatever

User · Answer

you can try this way   Fragment currentFragment   getFragmentManager   findFragmentById R id fragment container     or  Fragment currentFragment   getSupportFragmentManager   findFragmentById R id fragment container     In this if  you check if currentFragment is  instance of YourFragment  if  currentFragment instanceof YourFragment         Log v TAG   your Fragment is Visible

[android] How to know if a Fragment is Visible?

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