Editor

CardsWithHeadersDecoration.java

// Copyright 2017 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.example.billingmodule.skulist;

import android.graphics.Rect;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import com.example.billingmodule.skulist.row.RowDataProvider;
import com.example.billingmodule.skulist.row.SkuRowData;

/**
 * A separator for RecyclerView that keeps the specified spaces between headers and the cards.
 */
public class CardsWithHeadersDecoration extends RecyclerView.ItemDecoration {

private final RowDataProvider mRowDataProvider;
        private final int mHeaderGap, mRowGap;

public CardsWithHeadersDecoration(RowDataProvider rowDataProvider, int headerGap,
                int rowGap) {
            this.mRowDataProvider = rowDataProvider;
            this.mHeaderGap = headerGap;
            this.mRowGap = rowGap;
        }

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

final int position = parent.getChildAdapterPosition(view);
            final SkuRowData data = mRowDataProvider.getData(position);

// We should add a space on top of every header card
            if (data.getRowType() == SkusAdapter.TYPE_HEADER) {
                outRect.top = mHeaderGap;
            }

// Adding a space under the last item
            if (position == parent.getAdapter().getItemCount() - 1) {
                outRect.bottom = mHeaderGap;
            } else {
                outRect.bottom = mRowGap;
            }
        }
}