Simple divider item decoration that also draws a divider on top of the first item

MyItemDecoration.java

public class MyItemDecoration extends RecyclerView.ItemDecoration {

    private static final int[] ATTRS = new int[]{ android.R.attr.listDivider };

    private Drawable mDivider;

    public MyItemDecoration(Context context) {
        TypedArray a = context.obtainStyledAttributes(ATTRS);
        mDivider = a.getDrawable(0);
        a.recycle();
    }

    @Override
    public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
        int left = 0;
        int right = parent.getWidth();

        int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            View child = parent.getChildAt(i);
            int position = parent.getChildLayoutPosition(child);

            int bottom = child.getBottom();
            int top = bottom - mDivider.getIntrinsicHeight();

            mDivider.setBounds(left, top, right, bottom);
            mDivider.draw(c);

            if (position == 0) {
                bottom = child.getTop();
                top = bottom - mDivider.getIntrinsicHeight();

                mDivider.setBounds(left, top, right, bottom);
                mDivider.draw(c);
            }
        }
    }

    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        int height = mDivider.getIntrinsicHeight();
        int position = parent.getChildLayoutPosition(view);

        outRect.top = (position == 0) ? height : 0;
        outRect.bottom = height;
    }
}