How to find percentage of each visible item in recycleview

Question

int findFirstVisibleItemPosition();
int findFirstCompletelyVisibleItemPosition();
int findLastVisibleItemPosition();
int findLastCompletelyVisibleItemPosition();
         


        

Answer 1

Override the ScrollChangedListener of recyclerview and add below code in onScollerdChanged, to get the visibility of your row.

           if (rvPercentage != null){
                LinearLayoutManager layoutManager = ((LinearLayoutManager) rvPercentage.getLayoutManager());

                final int firstPosition = layoutManager.findFirstVisibleItemPosition();
                final int lastPosition = layoutManager.findLastVisibleItemPosition();

                Rect rvRect = new Rect();
                rvPercentage.getGlobalVisibleRect(rvRect);

                for (int i = firstPosition; i <= lastPosition; i++) {
                    Rect rowRect = new Rect();
                    layoutManager.findViewByPosition(i).getGlobalVisibleRect(rowRect);

                    int percentFirst;
                    if (rowRect.bottom >= rvRect.bottom){
                        int visibleHeightFirst =rvRect.bottom - rowRect.top;
                        percentFirst = (visibleHeightFirst * 100) / layoutManager.findViewByPosition(i).getHeight();
                    }else {
                        int visibleHeightFirst = rowRect.bottom - rvRect.top;
                        percentFirst = (visibleHeightFirst * 100) / layoutManager.findViewByPosition(i).getHeight();
                    }

                    if (percentFirst>100)
                        percentFirst = 100;

                    mData.get(i).setPercentage(percentFirst);
                    mAdapter.notifyItemChanged(i);
                }
            }

It gives you below output: