| /* |
| * Copyright 2017, The Android Open Source Project |
| * |
| * 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.android.persistence.ui; |
| |
| import android.databinding.DataBindingUtil; |
| import android.support.annotation.Nullable; |
| import android.support.v7.util.DiffUtil; |
| import android.support.v7.widget.RecyclerView; |
| import android.view.LayoutInflater; |
| import android.view.ViewGroup; |
| |
| import com.example.android.persistence.databinding.ProductItemBinding; |
| import com.example.android.persistence.model.Product; |
| import com.example.android.persistence.R; |
| |
| import java.util.List; |
| import java.util.Objects; |
| |
| public class ProductAdapter extends RecyclerView.Adapter<ProductAdapter.ProductViewHolder> { |
| |
| List<? extends Product> mProductList; |
| |
| @Nullable |
| private final ProductClickCallback mProductClickCallback; |
| |
| public ProductAdapter(@Nullable ProductClickCallback clickCallback) { |
| mProductClickCallback = clickCallback; |
| } |
| |
| public void setProductList(final List<? extends Product> productList) { |
| if (mProductList == null) { |
| mProductList = productList; |
| notifyItemRangeInserted(0, productList.size()); |
| } else { |
| DiffUtil.DiffResult result = DiffUtil.calculateDiff(new DiffUtil.Callback() { |
| @Override |
| public int getOldListSize() { |
| return mProductList.size(); |
| } |
| |
| @Override |
| public int getNewListSize() { |
| return productList.size(); |
| } |
| |
| @Override |
| public boolean areItemsTheSame(int oldItemPosition, int newItemPosition) { |
| return mProductList.get(oldItemPosition).getId() == |
| productList.get(newItemPosition).getId(); |
| } |
| |
| @Override |
| public boolean areContentsTheSame(int oldItemPosition, int newItemPosition) { |
| Product product = productList.get(newItemPosition); |
| Product old = productList.get(oldItemPosition); |
| return product.getId() == old.getId() |
| && Objects.equals(product.getDescription(), old.getDescription()) |
| && Objects.equals(product.getName(), old.getName()) |
| && product.getPrice() == old.getPrice(); |
| } |
| }); |
| mProductList = productList; |
| result.dispatchUpdatesTo(this); |
| } |
| } |
| |
| @Override |
| public ProductViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { |
| ProductItemBinding binding = DataBindingUtil |
| .inflate(LayoutInflater.from(parent.getContext()), R.layout.product_item, |
| parent, false); |
| binding.setCallback(mProductClickCallback); |
| return new ProductViewHolder(binding); |
| } |
| |
| @Override |
| public void onBindViewHolder(ProductViewHolder holder, int position) { |
| holder.binding.setProduct(mProductList.get(position)); |
| holder.binding.executePendingBindings(); |
| } |
| |
| @Override |
| public int getItemCount() { |
| return mProductList == null ? 0 : mProductList.size(); |
| } |
| |
| static class ProductViewHolder extends RecyclerView.ViewHolder { |
| |
| final ProductItemBinding binding; |
| |
| public ProductViewHolder(ProductItemBinding binding) { |
| super(binding.getRoot()); |
| this.binding = binding; |
| } |
| } |
| } |