Scroll State Of Recyclerview Inside ViewPager Tab Fragment Not Saved When Device Orientation Is Handled Manually Using OnConfigurationChanged()

What I want to achieve: FragmentOne is under Tab1 and FragmentTwoPortrait is under Tab2. I want to save the state of the recyclerview of FragmentTwoPortrait, then restore the frag

Solution 1:

First of all get current visible position of your RecyclerView by adding addOnScrollListener() as follows :

private int position=0;
myRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
                super.onScrollStateChanged(recyclerView, newState);
                if (newState == RecyclerView.SCROLL_STATE_IDLE){
                    position = ((LinearLayoutManager)recyclerView.getLayoutManager()).findFirstVisibleItemPosition();
                }
            }
        });

Now save the current visible position in onSaveInstanceState() method as follows :

@Override
    public void onSaveInstanceState(@NonNull Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putInt("visiblePosition", position);
    }

Then in Your onActivityCreated() get current visible position from savedInstanceState and set scroll position as follows:

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
        if(savedInstanceState.getInt("visiblePosition")>0)
        myFriendsRecyclerView.scrollToPosition(savedInstanceState.getInt("visiblePosition"));
    }

I hope its work for you thank you

Solution 2:

If you want same behaviour in both portrait and landscape mode then try not to save any configuration

In AndroidManifest for this particular activity

android:configChanges="keyboardHidden|orientation"