Created
June 27, 2017 04:26
-
-
Save vtthach/ca7c35b40b04c08a6d8b9e7ef3cb2505 to your computer and use it in GitHub Desktop.
Sampel using DiffUtil when update product list
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/* | |
* 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; | |
} | |
} | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment