Vertical ViewPager The other answers here all seemed to have some problems with them. Even the recommended open source projects weren’t merging recent pull requests with bug fixes. Then I found a VerticalViewPager from Google that they used some DeskClock app. I trust using Google’s implementation a lot more than the other answers floating around … Read more
When the FragmentPagerAdapter adds a fragment to the FragmentManager, it uses a special tag based on the particular position that the fragment will be placed. FragmentPagerAdapter.getItem(int position) is only called when a fragment for that position does not exist. After rotating, Android will notice that it already created/saved a fragment for this particular position and … Read more
When using FragmentPagerAdapter or FragmentStatePagerAdapter, it is best to deal solely with getItem() and not touch instantiateItem() at all. The instantiateItem()–destroyItem()–isViewFromObject() interface on PagerAdapter is a lower-level interface that FragmentPagerAdapter uses to implement the much simpler getItem() interface. Before getting into this, I should clarify that if you want to switch out the actual fragments … Read more
There is another solution that does not need modifying source code of ViewPager and FragmentStatePagerAdapter, and it works with the FragmentPagerAdapter base class used by the author. I’d like to start by answering the author’s question about which ID he should use; it is ID of the container, i.e. ID of the view pager itself. … Read more
As this is a very frequently asked question, I wanted to take the time and effort to explain the ViewPager with multiple Fragments and Layouts in detail. Here you go. ViewPager with multiple Fragments and Layout files – How To The following is a complete example of how to implement a ViewPager with different fragment … Read more
In ViewPager2 and ViewPager from version androidx.fragment:fragment:1.1.0 you can just use onPause and onResume callbacks to determine which fragment is currently visible for the user. onResume callback is called when fragment became visible and onPause when it stops to be visible. In case of ViewPager2 it is default behavior but the same behavior can be … Read more
Now we no need to create custom ViewPager A new ViewPager2 name View available in android Vertical orientation support ViewPager2 supports vertical paging in addition to traditional horizontal paging. You can enable vertical paging for a ViewPager2 element by setting its android:orientation attribute Using XML <androidx.viewpager2.widget.ViewPager2 xmlns:android=”http://schemas.android.com/apk/res/android” android:id=”@+id/pager” android:orientation=”vertical” /> Using code To disable swiping … Read more
ViewPager PagerAdapter not updating the View
The main answer relies on a name being generated by the framework. If that ever changes, then it will no longer work. What about this solution, overriding instantiateItem() and destroyItem() of your Fragment(State)PagerAdapter: public class MyPagerAdapter extends FragmentStatePagerAdapter { SparseArray<Fragment> registeredFragments = new SparseArray<Fragment>(); public MyPagerAdapter(FragmentManager fm) { super(fm); } @Override public int getCount() { … Read more