Determine when a ViewPager changes pages

Question

I have three pages  Fragments  inside a ViewPager  however I only want to display a menu item for two of those pages   The code given in a previous SO answer does not seem to work    Override public void setUserVisibleHint boolean isVisibleToUser        super setUserVisibleHint isVisibleToUser        if  isVisibleToUser    true          else if  isVisibleToUser    false            Eclipse says  Override isn t needed and super can t be set  It s never called by the system  and even if it was how would I determine which page was being shown at the moment  Could I have some help here

User · Answer

For ViewPager2    viewPager registerOnPageChangeCallback object   ViewPager2 OnPageChangeCallback       override fun onPageSelected position  Int        super onPageSelected position           where OnPageChangeCallback is a static class with three methods   onPageScrolled int position  float positionOffset   Px int positionOffsetPixels   onPageSelected int position    onPageScrollStateChanged  ScrollState int state

User · Answer

ViewPager setOnPageChangeListener is deprecated now  You now need to use ViewPager addOnPageChangeListener instead   for example   viewPager addOnPageChangeListener new ViewPager OnPageChangeListener              Override         public void onPageScrolled int position  float positionOffset  int positionOffsetPixels                         Override         public void onPageSelected int position                         Override         public void onPageScrollStateChanged int state

User · Answer

Use the ViewPager onPageChangeListener   viewPager addOnPageChangeListener new OnPageChangeListener         public void onPageScrollStateChanged int state         public void onPageScrolled int position  float positionOffset  int positionOffsetPixels          public void onPageSelected int position               Check if this is the page you want

User · Answer

Kotlin Users   viewPager addOnPageChangeListener object   ViewPager OnPageChangeListener                override fun onPageScrollStateChanged state  Int                               override fun onPageScrolled position  Int  positionOffset  Float  positionOffsetPixels  Int                                override fun onPageSelected position  Int                               Update 2020 for ViewPager2          viewPager registerOnPageChangeCallback object   ViewPager2 OnPageChangeCallback             override fun onPageScrollStateChanged state  Int                println state                     override fun onPageScrolled              position  Int              positionOffset  Float              positionOffsetPixels  Int                         super onPageScrolled position  positionOffset  positionOffsetPixels              println position                      override fun onPageSelected position  Int                super onPageSelected position              println position

User · Answer

You can also use ViewPager SimpleOnPageChangeListener instead of ViewPager OnPageChangeListener and override only those methods you want to use   viewPager addOnPageChangeListener new ViewPager SimpleOnPageChangeListener             optional       Override     public void onPageScrolled int position  float positionOffset  int positionOffsetPixels              optional       Override     public void onPageSelected int position              optional       Override     public void onPageScrollStateChanged int state            Hope this help     Edit  As per android APIs  setOnPageChangeListener  ViewPager OnPageChangeListener listener  is deprecated  Please check this url - Android ViewPager API

[android] Determine when a ViewPager changes pages

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