PopupTextProvider in FastScrollNestedScrollView

[tosam144]

I would like to know how I can implement PopupTextProvider in FastScrollNestedScrollView? The direct child of FastScrollNestedScrollView is a LinearLayout, which contains some TextViews and also a nested RecyclerView (with android:isScrollContainer="false"). I tried to use

new FastScrollerBuilder(mNestedScrollView).setPopupTextProvider(position -> "some text").build();

But the code "some text" is never called. Any ideas?

[zhanghai]

Yes, the bundled ViewHelper implementation FastScrollNestedScrollView.SimpleViewHelper doesn't implement ViewHelper.getPopupText(), because it has no idea of when to show what text. You can implement your own ViewHelper along with ViewHelper.getPopupText() if you know how the scroll position should correspond to popup text in your own app's logic.