Android calculate percentage of scrolling recyclerView

Question

i'm trying to show percentage of scrolling automatically to end of recylerview item by this code:

visibleItemCount = bookContentLayoutManager.getChildCount();
totalItemCount   = bookContentLayoutManager.getItemCount();
firstVisibleItem = bookContentLayoutManager.findFirstVisibleItemPosition();

float percentage = (visibleItemCount * 100 / totalItemCount);
Log.e("percent ", percentage + "");

but it doesn't correct and i'm trying to find whats is solution of that, it means show percentage of current scrolled recyclerview items

Answer 1

Recyclerview provides the following methods for vertical and horizontal scroll use the below code,

        int offset = recyclerView.computeVerticalScrollOffset();
        int extent = recyclerView.computeVerticalScrollExtent();
        int range = recyclerView.computeVerticalScrollRange();

        float percentage = (100.0f * offset / (float)(range - extent));