OrderListDividerDecorator.java

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.support.v7.widget.RecyclerView;
import android.view.View;

import gb.sweetlifecl.R;

public class OrderListDividerDecorator extends RecyclerView.ItemDecoration {

    private final Drawable mDivider;
    private final float offset;

    private int leftPadding;
    private int topPadding;
    private int rightPadding;
    private int bottomPadding;

    public OrderListDividerDecorator(Context context, Drawable divider) {
        offset = context.getResources().getDimension(R.dimen.margin8);
        mDivider = divider;
    }

    @Override
    public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
        int dividerLeft = parent.getPaddingLeft();
        int dividerRight = parent.getWidth() - parent.getPaddingRight();
        for (int i = 0; i < parent.getChildCount(); i++) {
            View child = parent.getChildAt(i);
            RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
            int dividerTop = child.getBottom() + params.bottomMargin;
            int dividerBottom = dividerTop + mDivider.getIntrinsicHeight();
            mDivider.setBounds(dividerLeft + leftPadding, dividerTop + topPadding, dividerRight - rightPadding, dividerBottom - bottomPadding);
            mDivider.draw(c);
        }
    }

    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        super.getItemOffsets(outRect, view, parent, state);
        if (parent.getChildAdapterPosition(view) == 0) return;
        if (view.getId() == R.id.order_footer_item) {
            outRect.bottom = (int) (mDivider.getIntrinsicHeight() + offset);
        }
        outRect.top = mDivider.getIntrinsicHeight();
    }
}