Add a background color (or in the future dotted outline, etc.) for a cell background that does not move with dragging/swiping

CellBackgroundColorItemDecorator.java

/**
 * This adds a background color to all recycler view cells that is not moved when dragging a view - this allows a "placeholder" for dragged items
 * such as a background color, in the future a dotted/broken line outline, etc.
 */
public class CellBackgroundColorItemDecorator extends ItemDecoration {
    private final Paint colorPaint;

    public CellBackgroundColorItemDecorator(@ColorInt int color) {
        colorPaint = new Paint();
        colorPaint.setColor(color);
    }

    @Override
    public void onDraw(Canvas c, RecyclerView parent, State state) {
        for (int i = 0; i < parent.getChildCount(); i++) {
            View child = parent.getChildAt(i);

            float left = child.getX() - child.getTranslationX();
            float right = left + child.getWidth();

            float top = child.getY() - child.getTranslationY();
            float bottom = top + child.getHeight();

            c.drawRect(left, top, right, bottom, colorPaint);

        }

        super.onDraw(c, parent, state);
    }
}