使用DiffUtil高效更新Recyclerview

package com.ethanco.diffutiltest; import android.content.Context; import android.databinding.DataBindingUtil; import android.os.Bundle; import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import com.ethanco.diffutiltest.databinding.ItemBinding; import java.util.List; /** * 最核心类，不要被命名困惑，它不像你日常所使用的回调。可以将它理解成 比较新老数据集时的规则 * 通过覆盖特定方法给出数据比较逻辑 * Created by EthanCo on 2016/9/5. */ public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ItemViewHodler> { public static final String KEY_TITLE = "MyAdapter_key_title"; public static final String KEY_CONTENT = "MyAdapter_key_content"; public static final String KEY_FOOTER = "MyAdapter_key_footer"; public void setData(List<Item> data) { this.data = data; } private List<Item> data; private Context mContext; public MyAdapter(Context context, List<Item> data) { this.data = data; this.mContext = context; } @Override public ItemViewHodler onCreateViewHolder(ViewGroup parent, int viewType) { LayoutInflater inflater = LayoutInflater.from(mContext); View view = inflater.inflate(R.layout.item, parent, false); return new ItemViewHodler(view); } @Override public void onBindViewHolder(ItemViewHodler holder, int position) { holder.bindData(data.get(position)); } @Override public void onBindViewHolder(ItemViewHodler holder, int position, List<Object> payloads) { super.onBindViewHolder(holder, position, payloads); if (holder instanceof ItemViewHodler) { ((ItemViewHodler) holder).bindData(data.get(position)); } if (payloads == null || payloads.isEmpty()) { return; } Bundle o = (Bundle) payloads.get(0); for (String key : o.keySet()) { switch (key) { case KEY_TITLE: ((ItemViewHodler) holder).updateTitle(o.getString(KEY_TITLE)); break; case KEY_CONTENT: ((ItemViewHodler) holder).updateContent(o.getString(KEY_CONTENT)); break; case KEY_FOOTER: ((ItemViewHodler) holder).updateFooter(o.getString(KEY_FOOTER)); break; } } } @Override public int getItemCount() { return data.size(); } class ItemViewHodler extends RecyclerView.ViewHolder { private final ItemBinding binding; public ItemViewHodler(View itemView) { super(itemView); binding = DataBindingUtil.bind(itemView); } public void bindData(Item item) { binding.setItem(item); } public void updateTitle(String title) { binding.tvTitle.setText(title); } public void updateContent(String content) { binding.tvContent.setText(content); } public void updateFooter(String footer) { binding.tvFooter.setText(footer); } } }