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本文出自【DylanAndroid的博客】

精通RecyclerView：打造ListView、GridView、瀑布流；学会添加分割线、 添加删除动画 、Item点击事件

在上一篇Android用RecyclerView练手仿美团分类界面写了RecyclerView的基本用法，
今天想想，在这里重新学习一下RecyclerView的完整用法。包括如何打造一个普通的ListView和横向的ListView、普通的GridView和横向的GridView、如何添加分割线、
还有就是添加和删除的动画、以及如何设置Item的OnClick事件监听。这里包含了各种用法，也算是一个入门的用法，已经掌握的高手请略过。

先看总体效果图

一.RecyclerView介绍

RecyclerView 是Android 5.0版本中新出现的东西，用来替代ListView和GridView的。

二.RecyclerView架构

RecyclerView使用布局管理器LayoutManager和适配器Adapter的适配器模式去实现架构，不关心数据的来源。耦合性非常的底，用户可以根据自己的用户界面去实现相应的效果

三.RecyclerView的优点

• 1.RecyclerView内部已经强制使用VIewHolder，优化了对Item中View的复用。

• 2.提供了一个较为灵活的布局管理类，LayoutManager，用来控制RecyclerView是线性展示还是垂直展示，以及可以设置成瀑布流。并且提供了ItemDecoration这个类，来灵活的让用户来设置分割线。

• 3.用ItemAnimator可以对item进行布局的删减动画效果。

四.RecyclerView实现三部曲

• 第一步：设置布局管理器

  用来确定每一个item如何进行排列摆放:

  • LinearLayoutManager 相当于ListView的效果
  • GridLayoutManager相当于GridView的效果
  • StaggeredGridLayoutManager 瀑布流

• 第二步：添加分割线

  我们用到了网上流传的万能分割线DividerItemDecoration和DividerGridItemDecoration，首先在style.xml里面定义分割线图片：

  1.先在drawable中新建divider.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >
    <solid android:color="@color/colorAccent"/>
    <size android:height="1dp"
        android:width="1dp"/>
</shape>

    2.然后在style.xml中设置android:listDivider

        <item name="android:listDivider">@drawable/divider</item>

• 第三步：设置适配器

package cn.bluemobi.dylan.recyclerviewdemo2;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

/**
 * RecyclerView的适配器
 * Created by yuandl on 2016-11-01.
 */

public class RvAdapter extends RecyclerView.Adapter<RvAdapter.MyViewHolder> {
    private Context context;
    private List<Integer> datas;

    /**
     * item的点击事件的长按事件接口
     */
    private OnItemClickListener onItemClickListener;
    /**
     * 瀑布流时的item随机高度
     */
    private List<Integer> heights = new ArrayList<>();

    /**
     * 不同的类型设置item不同的高度
     *
     * @param type
     */

    private int type = 0;

    public RvAdapter(Context context, List<Integer> datas) {
        this.context = context;
        this.datas = datas;
        for (int i : datas) {
            int height = (int) (Math.random() * 100 + 300);
            heights.add(height);
        }
    }

    public void setType(int type) {
        this.type = type;
    }

    /**
     * 设置点击事件
     *
     * @param onItemClickListener
     */
    public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
        this.onItemClickListener = onItemClickListener;
    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View contentView = LayoutInflater.from(context).inflate(R.layout.item, parent, false);
        MyViewHolder viewHolder = new MyViewHolder(contentView);
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(MyViewHolder holder, final int position) {
        RecyclerView.LayoutParams layoutParams;
        if (type == 0) {
            layoutParams = new RecyclerView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
        } else if (type == 1) {
            layoutParams = new RecyclerView.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
        } else {
            layoutParams = new RecyclerView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, heights.get(position));
            layoutParams.setMargins(2, 2, 2, 2);
        }
        holder.itemView.setLayoutParams(layoutParams);
        holder.imageView.setImageResource(datas.get(position));
        holder.tv.setText("分类" + position);
        /**设置item点击监听**/
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (onItemClickListener != null) {
                    onItemClickListener.onItemClickListener(position, datas.get(position));
                }
            }
        });

    }

    @Override
    public int getItemCount() {
        return datas == null ? 0 : datas.size();
    }

    /**
     * 用于缓存的ViewHolder
     */
    public class MyViewHolder extends RecyclerView.ViewHolder {
        private ImageView imageView;
        public TextView tv;

        public MyViewHolder(View itemView) {
            super(itemView);
            imageView = (ImageView) itemView.findViewById(R.id.iv);
            tv = (TextView) itemView.findViewById(R.id.tv);
        }
    }

    /**
     * 设置item监听的接口
     */
    public interface OnItemClickListener {
        void onItemClickListener(int position, Integer data);

    }
}

五.打造各种效果

• 1.竖向的ListView

    rv.setBackgroundColor(Color.TRANSPARENT);
    rv.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));
    rvAdapter.setType(0);
    rv.removeItemDecoration(itemDecoration);
    rv.setLayoutParams(new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.MATCH_PARENT));
    itemDecoration = new DividerItemDecoration(this, DividerItemDecoration.VERTICAL_LIST);
    rv.addItemDecoration(itemDecoration);

• 2.横向的ListView

   rvAdapter.setType(1);
   rv.removeItemDecoration(itemDecoration);
   rv.setLayoutParams(new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.WRAP_CONTENT));
   rv.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false));
   itemDecoration = new DividerItemDecoration(this, DividerItemDecoration.HORIZONTAL_LIST);
   rv.addItemDecoration(itemDecoration);

• 3.竖向的GridView

   rvAdapter.setType(1);
   rv.setBackgroundColor(Color.TRANSPARENT);
   rv.removeItemDecoration(itemDecoration);
   rv.setLayoutParams(new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.MATCH_PARENT));
   rv.setLayoutManager(new GridLayoutManager(this, 5));
   itemDecoration = new DividerGridItemDecoration(this);
   rv.addItemDecoration(itemDecoration);

• 4.横向的GridView

    rvAdapter.setType(1);
    rv.setBackgroundColor(Color.TRANSPARENT);
    rv.setLayoutParams(new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.WRAP_CONTENT));
    rv.removeItemDecoration(itemDecoration);
    rv.setLayoutManager(new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.HORIZONTAL));
    itemDecoration = new DividerGridItemDecoration(this);
    rv.addItemDecoration(itemDecoration);

• 5.竖向的瀑布流

     rvAdapter.setType(3);
     rv.setBackgroundColor(getResources().getColor(R.color.colorAccent));
     rv.setLayoutParams(new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.MATCH_PARENT));
     rv.removeItemDecoration(itemDecoration);
     rv.setLayoutManager(new StaggeredGridLayoutManager(5, StaggeredGridLayoutManager.VERTICAL));

• 6.添加和删除动画

       /**添加一个数据**/
       rvAdapter.notifyItemInserted(1);
       /**删除一个数据**/
       rvAdapter.notifyItemRemoved(1);

六.GiHub