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ProductAdapter.java
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ProductAdapter.java
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/*
* 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 androidx.annotation.NonNull;
import androidx.databinding.DataBindingUtil;
import androidx.annotation.Nullable;
import androidx.recyclerview.widget.DiffUtil;
import androidx.recyclerview.widget.RecyclerView;
import android.text.TextUtils;
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;
public class ProductAdapter extends RecyclerView.Adapter<ProductAdapter.ProductViewHolder> {
List<? extends Product> mProductList;
@Nullable
private final ProductClickCallback mProductClickCallback;
public ProductAdapter(@Nullable ProductClickCallback clickCallback) {
mProductClickCallback = clickCallback;
setHasStableIds(true);
}
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 newProduct = productList.get(newItemPosition);
Product oldProduct = mProductList.get(oldItemPosition);
return newProduct.getId() == oldProduct.getId()
&& TextUtils.equals(newProduct.getDescription(), oldProduct.getDescription())
&& TextUtils.equals(newProduct.getName(), oldProduct.getName())
&& newProduct.getPrice() == oldProduct.getPrice();
}
});
mProductList = productList;
result.dispatchUpdatesTo(this);
}
}
@Override
@NonNull
public ProductViewHolder onCreateViewHolder(@NonNull 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(@NonNull ProductViewHolder holder, int position) {
holder.binding.setProduct(mProductList.get(position));
holder.binding.executePendingBindings();
}
@Override
public int getItemCount() {
return mProductList == null ? 0 : mProductList.size();
}
@Override
public long getItemId(int position) {
return mProductList.get(position).getId();
}
static class ProductViewHolder extends RecyclerView.ViewHolder {
final ProductItemBinding binding;
public ProductViewHolder(ProductItemBinding binding) {
super(binding.getRoot());
this.binding = binding;
}
}
}