TabLayout scrolls to unkown position after calling notifyDataSetChanged on PagerAdapter

Question

I have sample project with TabLayout and PagerAdapter. Strange things happens with TabLayout when I call pagerAdapter.notifyDataSetChanged();

Answer 1

you can directly set the current postion.

you can get the selected position before notifying dataset change and save it in static varaible and update it everytime:

public static tabPostion;

    @Override
    public void onTabSelected(TabLayout.Tab tab) {
      tabPostion = tab.getPosition();
    }

    @Override
    public void onTabUnselected(TabLayout.Tab tab) {

    }

    @Override
    public void onTabReselected(TabLayout.Tab tab) {

    }

//set the postion of the pervious tab
    yourviewpager.setCurrentItem(tabPostion);

below is the code from my project :

   @Override
    public void onTabSelected(TabLayout.Tab tab) {

        // imageHashMap = new HashMap<>();
        onClearOrSelectAllImage(FlickQuickEnum.PIC_SELECTION_ACTION.CLEAR);
        selectedImageUrls = new HashMap<>();
        String tag = tab.getText().toString();
        String tagName = tag.substring(1, tag.length());
        currentTab = tagName;
        if (tagName != null) {
            dbAlbumPhotoList = new ArrayList<>();
            if (tagName.equals("All")) {
                dbAlbumPhotoList = dbAlbumPhotosHashMap.get(album.getAlbumName());
            } else {
                dbAlbumPhotoList = dbAlbumPhotosHashMap.get(tagName);
            }
        }
        updatePhotoCount();
        setPhotosSelectedActions(false);
    }

    @Override
    public void onTabUnselected(TabLayout.Tab tab) {

    }

    @Override
    public void onTabReselected(TabLayout.Tab tab) {

    }