Android add spacing below last element in recyclerview with gridlayoutmanager

Question

I am trying to add spacing below the last element row in RecyclerView with GridLayoutManager. I used custom ItemDecoration for this purpose with bottom padding when its last element as follows:

public class SpaceItemDecoration extends RecyclerView.ItemDecoration {
private int space;
private int bottomSpace = 0;

public SpaceItemDecoration(int space, int bottomSpace) {
    this.space = space;
    this.bottomSpace = bottomSpace;
}

public SpaceItemDecoration(int space) {
    this.space = space;
    this.bottomSpace = 0;
}

@Override
public void getItemOffsets(Rect outRect, View view,
                           RecyclerView parent, RecyclerView.State state) {

    int childCount = parent.getChildCount();
    final int itemPosition = parent.getChildAdapterPosition(view);
    final int itemCount = state.getItemCount();

    outRect.left = space;
    outRect.right = space;
    outRect.bottom = space;
    outRect.top = space;

    if (itemCount > 0 && itemPosition == itemCount - 1) {
        outRect.bottom = bottomSpace;
    }
}
}

But the problem with this method is that it messed up the element heights in the grid in last row. I am guessing that GridLayoutManager changes the heights for elements based on spacing left. What is the correct way to achieve this?

This will work correctly for a LinearLayoutManager. Just in case of a GridLayoutManager its problematic.

Its very useful in case you have a FAB in bottom and need items in last row to scroll above FAB so that they can be visible.

Answer 1

Just add a padding and set android:clipToPadding="false"

<RecyclerView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="8dp"
    android:clipToPadding="false" />

Thanks to this wonderful answer!