Android---RecyclerView网络请求图片加载

RecyclerView的基本使用

什么是RecyclerView

  recycleview是support-v7包中的新组件，是一个强大的滑动组件，从它的名字recyclerview可以看出它具有回收复用的功能。

为什么要使用RecyclerView （为什么使用RecyclerView）？

①RecylerView封装了viewholder的回收复用，也就是说RecylerView标准化了ViewHolder，编写Adapter面向的是 ViewHolder而不再是View了，复用的 逻辑被封装了，写起来更加简单。

②提供了一种插拔式的体验，高度的解耦，异常的灵活，针对一个Item的显示RecylerView专门抽取出了相应的类，来控制Item的显示，使其的扩展性非常强。例如recyclerview不局限与下拉列表，它还支持GridView效果和瀑布流效果

③可以控制Item增删的动画，可以通过ItemAnimator这个类进行控制，当然针对增删的动画，RecylerView有其自己默认的实现。

④能实现ListView、GridView、staggeredgridview 布局

如何使用RecyclerView?（我使用的是网络请求图片 本文参考了http://blog.csdn.net/lmj623565791/article/details/45059587； 出自:【张鸿洋的博客】 ）

RecyclerView基本使用代码（设置布局 、adapter、item动画、分割线）

   mRecyclerView = findView(R.id.id_recyclerview);        //设置布局管理器        mRecyclerView.setLayoutManager(layout);        //设置adapter        mRecyclerView.setAdapter(adapter)        //设置Item增加、移除动画        mRecyclerView.setItemAnimator(new DefaultItemAnimator());        //添加分割线        mRecyclerView.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.VERTICAL)); // 设置默认分割线

具体步骤

先看效果图

①导入依赖（在model的build.radle 中 dependencies 导入）

 //recyclerView的依赖    compile 'com.android.support:mediarouter-v7:25.0.0'    compile 'com.android.support:appcompat-v7:25.0.0'    compile 'com.android.support:recyclerview-v7:25.0.0'    //BufferKnife的依赖    compile 'com.jakewharton:butterknife:7.0.1'    //okhttp的依赖    compile 'com.squareup.okio:okio:1.5.0'    compile 'com.squareup.okhttp3:okhttp:3.2.0'    compile 'com.squareup.okhttp3:logging-interceptor:3.4.1'    //gson的依赖    compile 'com.google.code.gson:gson:2.8.2'    compile files('libs/universal-image-loader-1.9.3.jar')

② 在MainActivity写入一下代码

package com.dabin.www.recycleview01;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.support.v7.widget.DefaultItemAnimator;import android.support.v7.widget.GridLayoutManager;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;import android.support.v7.widget.StaggeredGridLayoutManager;import android.view.View;import android.widget.Toast;import java.io.IOException;import java.util.List;import adpter.HomeAdapter;import bean.NewBase;import custom.DividerItemDecoration;import okhttp3.Call;import utils.GsonObjectCallback;import utils.NetWorkUtils;import utils.OkHttp3Utils;public class MainActivity extends AppCompatActivity {    private RecyclerView mRecyclerView;    HomeAdapter homeAdapter;    List<NewBase.DataBean> data;    private String path = "http://api.expoon.com/AppNews/getNewsList/type/1/p/1";    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        //判断网络状态        boolean netWorkAvailable = NetWorkUtils.isNetWorkAvailable(this);        if (!netWorkAvailable) {            Toast.makeText(MainActivity.this, "联网：" + netWorkAvailable, Toast.LENGTH_SHORT).show();        }        //okhttp请求数据        OkHttp3Utils.getInstance().doGet(path, new GsonObjectCallback<NewBase>() {            @Override            public void onUi(NewBase newBase) {                data = newBase.getData();                homeAdapter = new HomeAdapter(MainActivity.this, data);   //适配器 一定要写在刚得到数据之后                mRecyclerView.setAdapter(homeAdapter);  // 设置适配器                //设置点击事件 (接口回调)                homeAdapter.setOnItemClickLitener(new HomeAdapter.OnItemClickLitener() {                    @Override                    //点击吐司                    public void onItemClick(View view, int position) {                        Toast.makeText(MainActivity.this, position + " click",                                Toast.LENGTH_SHORT).show();                    }                    //长按吐司删除                    @Override                    public void onItemLongClick(View view, int position) {                        Toast.makeText(MainActivity.this, position + " long click",                                Toast.LENGTH_SHORT).show();                        homeAdapter.removeData(position);                    }                });            }            @Override            public void onFailed(Call call, IOException e) {            }        });        mRecyclerView = (RecyclerView) findViewById(R.id.id_recyclerview);        mRecyclerView.setLayoutManager(new StaggeredGridLayoutManager(4,StaggeredGridLayoutManager.HORIZONTAL));//设置StaggeredGridLayoutManager横向布局管理器(修改item布局就可以控制大小)        //mRecyclerView.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.VERTICAL)); // 设置默认分割线        //mRecyclerView.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.HORIZONTAL_LIST)); //自定义横向分割线        // 设置item动画        mRecyclerView.setItemAnimator(new DefaultItemAnimator());    }    //添加    public void add(View v) {        homeAdapter.addData(1);    }    //删除    public void delete(View v) {        homeAdapter.removeData(1);    }    //线性布局    public void Linears(View v) {        mRecyclerView.setLayoutManager(new LinearLayoutManager(this)); //设置LinearLayoutManager布局管理器    }    //网格布局    public void Grids(View v) {        mRecyclerView.setLayoutManager(new GridLayoutManager(this, 4));//设置GridLayoutManager布局管理器    }    //瀑布横向布局    public void Staggeredx(View v) {        mRecyclerView.setLayoutManager(new StaggeredGridLayoutManager(4,StaggeredGridLayoutManager.HORIZONTAL));//设置StaggeredGridLayoutManager纵向布局管理器    }    //瀑布纵向布局    public void Staggeredy(View v) {        mRecyclerView.setLayoutManager(new StaggeredGridLayoutManager(4,StaggeredGridLayoutManager.VERTICAL));//设置StaggeredGridLayoutManager纵向布局管理器    }    //横向分割线    public void hang(View v) {        mRecyclerView.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.HORIZONTAL_LIST)); //自定义纵向分割线    }    //纵向分割线    public void zong(View v) {        mRecyclerView.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.VERTICAL_LIST)); //自定义纵向分割线    }    //总分割线    public void zongall(View v) {        mRecyclerView.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.VERTICAL_LIST)); //自定义纵向分割线        mRecyclerView.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.HORIZONTAL_LIST)); //自定义纵向分割线    }}

使用的是OKhttp3网络请求工具，下面会给出源码（在utils包下）。

③在activity_main.xml布局下

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/activity_main"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.dabin.www.recycleview01.MainActivity"><LinearLayout    android:id="@+id/LL"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:orientation="horizontal">    <Button        android:text="添加"        android:onClick="add"        android:id="@+id/adds"        android:layout_width="0dp"        android:layout_weight="1"        android:layout_height="wrap_content"        />    <Button        android:text="删除"        android:id="@+id/deletes"        android:onClick="delete"        android:layout_width="0dp"        android:layout_weight="1"        android:layout_height="wrap_content" />    <Button        android:text="线性"        android:onClick="Linears"        android:layout_width="0dp"        android:layout_weight="1"        android:layout_height="wrap_content" /></LinearLayout>    <LinearLayout        android:id="@+id/erhang"        android:layout_below="@+id/LL"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="horizontal"        >        <Button            android:text="网格布局"            android:onClick="Grids"            android:layout_width="0dp"            android:layout_weight="1"            android:layout_height="wrap_content" />        <Button            android:text="瀑布横向"            android:onClick="Staggeredx"            android:layout_width="0dp"            android:layout_weight="1"            android:layout_height="wrap_content" />        <Button            android:text="瀑布纵向"            android:onClick="Staggeredy"            android:layout_width="0dp"            android:layout_weight="1"            android:layout_height="wrap_content" />    </LinearLayout>    <LinearLayout        android:id="@+id/sanhang"        android:layout_below="@+id/erhang"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="horizontal"        >        <Button            android:text="横分割线"            android:onClick="hang"            android:layout_width="0dp"            android:layout_weight="1"            android:layout_height="wrap_content" />        <Button            android:text="纵分割线"            android:onClick="zong"            android:layout_width="0dp"            android:layout_weight="1"            android:layout_height="wrap_content" />        <Button            android:text="总分割线"            android:onClick="zongall"            android:layout_width="0dp"            android:layout_weight="1"            android:layout_height="wrap_content" />    </LinearLayout>    <android.support.v7.widget.RecyclerView        android:layout_below="@+id/sanhang"        android:id="@+id/id_recyclerview"        android:divider="#ff00ff"        android:dividerHeight="10dp"        android:layout_width="match_parent"        android:layout_height="match_parent"/></RelativeLayout>

④新建一个HomeAdapter类

package adpter;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 com.dabin.www.recycleview01.R;import com.nostra13.universalimageloader.core.ImageLoader;import java.util.List;import bean.NewBase;/** * Created by Dabin on 2017/5/13. */public class HomeAdapter extends RecyclerView.Adapter<HomeAdapter.MyViewHolder> {    private Context context;    private  List<NewBase.DataBean> mDatas;    private OnItemClickLitener mOnItemClickLitener;  // 监听    //定义接口    public interface OnItemClickLitener {        void onItemClick(View view, int position);        void onItemLongClick(View view, int position);    }    public void setOnItemClickLitener(OnItemClickLitener mOnItemClickLitener) {        this.mOnItemClickLitener = mOnItemClickLitener;    }    //构造方法    public HomeAdapter(Context context, List<NewBase.DataBean> mDatas) {        this.context = context;        this.mDatas = mDatas;    }    // 实例化 Holder    @Override    public HomeAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        MyViewHolder holder = new MyViewHolder(LayoutInflater.from(context).inflate(R.layout.item, parent, false));        return holder;    }    //绑定holder  在onBindHolder中 设置数据    @Override    public void onBindViewHolder(final HomeAdapter.MyViewHolder holder, int position) {        ImageLoader instance = ImageLoader.getInstance();        holder.tv.setText(mDatas.get(position).getNews_title().toString());        instance.displayImage(mDatas.get(position).getPic_url(),holder.imageView);        // 如果设置了回调，则设置点击事件        if (mOnItemClickLitener != null) {            holder.itemView.setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View v) {                    int pos = holder.getLayoutPosition();                    mOnItemClickLitener.onItemClick(holder.itemView, pos);                }            });            holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {                @Override                public boolean onLongClick(View v) {                    int pos = holder.getLayoutPosition();                    mOnItemClickLitener.onItemLongClick(holder.itemView, pos);                    return false;                }            });        }    }    // 总条数    @Override    public int getItemCount() {        return mDatas.size();    }    // 在 holder中 找到控件    class MyViewHolder extends RecyclerView.ViewHolder {        TextView tv;        ImageView imageView;        public MyViewHolder(View view) {            super(view);            tv = view.findViewById(R.id.id_num);            imageView = view.findViewById(R.id.images);        }    }    //添加更新数据    public void addData(int position) {        //mDatas.add(position, "Dabin");        notifyItemInserted(position);    }    //删除更新数据    public void removeData(int position) {        //mDatas.remove(position);        notifyItemRemoved(position);    }}

⑤新建item.xml布局

<?xml version="1.0" encoding="utf-8"?><FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="wrap_content"    android:background="#44ff0000"    android:layout_margin="20dp"    android:layout_height="wrap_content">    <TextView        android:id="@+id/id_num"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:gravity="center"        android:text="1" />    <ImageView        android:id="@+id/images"        android:src="@mipmap/ic_launcher"        android:layout_width="wrap_content"        android:layout_height="wrap_content" /></FrameLayout>

⑥新建MyApp类

package app;import android.app.Application;import com.nostra13.universalimageloader.core.ImageLoader;import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;/** * Created by Dabin on 2017/5/13. */public class MyApp extends Application{    public static MyApp mInstance;    @Override    public void onCreate() {        super.onCreate();        mInstance = this;        ImageLoaderConfiguration aDefault = ImageLoaderConfiguration.createDefault(this);        ImageLoader.getInstance().init(aDefault);    }    public static MyApp getInstance() {        return mInstance;    }}

⑦因为是JSON数据所以新建一个类（NewBase）用来解析json

package bean;import java.util.List;/** * Created by Dabin on 2017/5/13. */public class NewBase {    /**     * status : 1     * info : 获取内容成功     * data : [{"news_id":"13811","news_title":"深港澳台千里连线，嘉年华会今夏入川","news_summary":"6月17\u201420日，\u201c2016成都深港澳台嘉年华会\u201d(简称嘉年华会)将在成都世纪城国际会展中心举办。其主办方励展华博借力旗","pic_url":"http://f.expoon.com/sub/news/2016/01/21/887844_230x162_0.jpg"},{"news_id":"13810","news_title":"第14届温州国际汽车展4月举行 设9大主题展馆","news_summary":"来自前不久举行的温州国际汽车展览会第一次新闻发布会的消息， 2016第14届温州国际汽车展览会定于4月7-10日在温州国","pic_url":"http://f.expoon.com/sub/news/2016/01/21/580828_230x162_0.jpg"},{"news_id":"13808","news_title":"第十二届中国(南安)国际水暖泵阀交易会 四大亮点","news_summary":"第十二届中国(南安)国际水暖泵阀交易会将于2月10日至12日(即农历正月初三至初五)在成功国际会展中心拉开帷幕。","pic_url":"http://f.expoon.com/sub/news/2016/01/21/745921_230x162_0.jpg"},{"news_id":"13805","news_title":"2016上海灯光音响展 商机无限，一触即发","news_summary":"2016上海国际专业灯光音响展即日起全面启动，海内外高端演艺设备商贸平台，商机无限，一触即发。6大洲，80个国家，25,","pic_url":"http://f.expoon.com/sub/news/2016/01/21/158040_230x162_0.jpg"},{"news_id":"13804","news_title":"第四届南京国际佛事展5月举行","news_summary":"2016年，\u201c第四届南京国际佛事文化用品展览会\u201d将于5月26-29日在南京国际展览中心举办。","pic_url":"http://f.expoon.com/sub/news/2016/01/21/865222_230x162_0.jpg"},{"news_id":"13802","news_title":"上海国际牛仔服装博览会 拓展国际贸易大市场","news_summary":"2016年第三届上海国际牛仔服装博览会将于4月19-21日再次璀璨再现上海世博展览馆，共同探讨牛仔流行趋势，诠释牛仔文化","pic_url":"http://f.expoon.com/sub/news/2016/01/20/370858_230x162_0.jpg"},{"news_id":"13800","news_title":"第三届兰州年货会在甘肃国际会展中心本月19日开幕","news_summary":"由中国商业联合会、甘肃省商业联合会、兰州市商务局主办，甘肃省酒类商品管理局、兰州市城关区商务局、第十四届西安年货会组委会","pic_url":"http://f.expoon.com/sub/news/2016/01/20/868385_230x162_0.jpg"},{"news_id":"13799","news_title":"首届移动拍卖艺术博览会启动","news_summary":"首届移动拍卖博览会已于2016年1月全面启动，由大咖拍卖主办，联合全国艺术机构共同打造拍卖艺术博览会主会场，近百场拍卖专","pic_url":"http://f.expoon.com/sub/news/2016/01/20/768695_230x162_0.jpg"},{"news_id":"13798","news_title":"武汉金融理财投资博览会将在5月举办","news_summary":"由武汉市贸促会、上海《理财周刊》社、湖北好博塔苏斯展览有限公司等单位联合发起的\u201c2016武汉金融理财投资博览会\u201d，将在武","pic_url":"http://f.expoon.com/sub/news/2016/01/20/512947_230x162_0.jpg"},{"news_id":"13796","news_title":"第三届中国微商博览会 3月底济南举办","news_summary":"2015年，沸点天下开创了微商行业第一个展会\u2014\u2014中国微商博览会，并于2015年成功举行两届，让微商展会从无到有，并且起了","pic_url":"http://f.expoon.com/sub/news/2016/01/20/348021_230x162_0.jpg"},{"news_id":"13793","news_title":"2016中国西部国际丝绸博览会","news_summary":"\u201c2016年中国西部国际丝绸博览会\u201d最新确定于2016年5月11日至15日在南充举行。据悉，\u201c丝博会\u201d的会徽、会标及宣传","pic_url":"http://f.expoon.com/sub/news/2016/01/19/113912_230x162_0.jpg"},{"news_id":"13792","news_title":"中国针棉织品交易会开拓\u201c西部市场\u201d","news_summary":"由国家商务部重点支持、中国纺织品商业协会主办的第98届中国针棉织品交易会将于3月15日～17日绽放成都。作为中国国内针棉","pic_url":"http://f.expoon.com/sub/news/2016/01/19/650175_230x162_0.jpg"},{"news_id":"13791","news_title":"乐山市第二十届房地产展示交易会开幕","news_summary":"美丽乐山，生态宜居。今日，乐山市第二十届房地产展示交易会在该市中心城区乐山广场开幕，展会将持续到1月24日。","pic_url":"http://f.expoon.com/sub/news/2016/01/19/321787_230x162_0.jpg"},{"news_id":"13790","news_title":"2016华中屋面与建筑防水技术展3月即将开幕","news_summary":"由湖北省建筑防水协会联合湖南、河南、江西、安徽五省建筑防水协会主办\u201c2016第二届华中屋面与建筑防水技术展览会\u201d将于20","pic_url":"http://f.expoon.com/sub/news/2016/01/19/376254_230x162_0.jpg"},{"news_id":"13789","news_title":"2016海南国际旅游贸易博览会召开新闻发布会","news_summary":"近日，三亚旅游官方网从海南省\u201c首届海博会\u201d新闻发布会上获悉，海南省\u201c首届海博会\u201d将于2016年3月26日至4月1日在三亚","pic_url":"http://f.expoon.com/sub/news/2016/01/19/958046_230x162_0.jpg"},{"news_id":"13788","news_title":"2016阿里巴巴·贵州年货节展销会开幕","news_summary":"\u201c2016阿里巴巴·贵州年货节\u201d的展销会及迎春庙会昨日启动。150多家餐饮商参与的美食节、近千个品种组成的年货展销会等，","pic_url":"http://f.expoon.com/sub/news/2016/01/19/371688_230x162_0.jpg"},{"news_id":"13787","news_title":"第二届中国盆栽花卉交易会\u200b 本月28日开幕","news_summary":"据广州市政府获悉，经中国花卉协会和广州市政府批准，第二届中国盆栽花卉交易会将于本月28日至31日在广州花卉博览园举行。届","pic_url":"http://f.expoon.com/sub/news/2016/01/18/687647_230x162_0.jpg"},{"news_id":"13786","news_title":"李益：视野、品质、融合是展览工程国际化的必由路径","news_summary":"\u201c视野、品质、融合是中国展览工程走向国际化的必由路径。\u201d北京逸格天骄国际展览有限公司副总经理李益日前在第二十二届国际(常","pic_url":"http://f.expoon.com/sub/news/2016/01/18/343556_230x162_0.jpg"},{"news_id":"13785","news_title":"第八届中国国际集成住宅产业博览会将于5月在广州举办","news_summary":"2016年1月14日，第八届中国(广州)国际集成住宅产业博览会暨2016亚太建筑科技论坛\u2014\u2014新闻发布会在广州馆隆重召开。","pic_url":"http://f.expoon.com/sub/news/2016/01/18/581830_230x162_0.jpg"},{"news_id":"13784","news_title":"丝绸之路敦煌国际文化博览会筹备工作进展顺利","news_summary":"近日，丝绸之路(敦煌)国际文化博览会组委会第二次会议在兰召开。会议研究讨论了省直厅局一对一服务保障沿线省区市方案、文博会","pic_url":"http://f.expoon.com/sub/news/2016/01/18/656693_230x162_0.jpg"}]     */    private int status;    private String info;    private List<DataBean> data;    public int getStatus() {        return status;    }    public void setStatus(int status) {        this.status = status;    }    public String getInfo() {        return info;    }    public void setInfo(String info) {        this.info = info;    }    public List<DataBean> getData() {        return data;    }    public void setData(List<DataBean> data) {        this.data = data;    }    public static class DataBean {        /**         * news_id : 13811         * news_title : 深港澳台千里连线，嘉年华会今夏入川         * news_summary : 6月17—20日，“2016成都深港澳台嘉年华会”(简称嘉年华会)将在成都世纪城国际会展中心举办。其主办方励展华博借力旗         * pic_url : http://f.expoon.com/sub/news/2016/01/21/887844_230x162_0.jpg         */        private String news_id;        private String news_title;        private String news_summary;        private String pic_url;        public String getNews_id() {            return news_id;        }        public void setNews_id(String news_id) {            this.news_id = news_id;        }        public String getNews_title() {            return news_title;        }        public void setNews_title(String news_title) {            this.news_title = news_title;        }        public String getNews_summary() {            return news_summary;        }        public void setNews_summary(String news_summary) {            this.news_summary = news_summary;        }        public String getPic_url() {            return pic_url;        }        public void setPic_url(String pic_url) {            this.pic_url = pic_url;        }    }}

⑧添加LinearLayoutManager分割线（用于显示LinearLayoutManager布局）

package custom;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Canvas;import android.graphics.Rect;import android.graphics.drawable.Drawable;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;import android.view.View;/** * Created by Dabin on 2017/5/13. * @Title  LinearLayoutManager  自定义分割线 * */public class DividerItemDecoration extends RecyclerView.ItemDecoration {    private static final int[] ATTRS = new int[]{            android.R.attr.listDivider    };    public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;    public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;    private Drawable mDivider;    private int mOrientation;    public DividerItemDecoration(Context context, int orientation) {        final TypedArray a = context.obtainStyledAttributes(ATTRS);        mDivider = a.getDrawable(0);        a.recycle();        setOrientation(orientation);    }    public void setOrientation(int orientation) {        if (orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST) {            throw new IllegalArgumentException("invalid orientation");        }        mOrientation = orientation;    }    @Override    public void onDraw(Canvas c, RecyclerView parent) {        if (mOrientation == VERTICAL_LIST) {            drawVertical(c, parent);        } else {            drawHorizontal(c, parent);        }    }    public void drawVertical(Canvas c, RecyclerView parent) {        final int left = parent.getPaddingLeft();        final int right = parent.getWidth() - parent.getPaddingRight();        final int childCount = parent.getChildCount();        for (int i = 0; i < childCount; i++) {            final View child = parent.getChildAt(i);            android.support.v7.widget.RecyclerView v = new android.support.v7.widget.RecyclerView(parent.getContext());            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child                    .getLayoutParams();            final int top = child.getBottom() + params.bottomMargin;            final int bottom = top + mDivider.getIntrinsicHeight();            mDivider.setBounds(left, top, right, bottom);            mDivider.draw(c);        }    }    public void drawHorizontal(Canvas c, RecyclerView parent) {        final int top = parent.getPaddingTop();        final int bottom = parent.getHeight() - parent.getPaddingBottom();        final int childCount = parent.getChildCount();        for (int i = 0; i < childCount; i++) {            final View child = parent.getChildAt(i);            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child                    .getLayoutParams();            final int left = child.getRight() + params.rightMargin;            final int right = left + mDivider.getIntrinsicHeight();            mDivider.setBounds(left, top, right, bottom);            mDivider.draw(c);        }    }    @Override    public void getItemOffsets(Rect outRect, int itemPosition, RecyclerView parent) {        if (mOrientation == VERTICAL_LIST) {            outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());        } else {            outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);        }    }}

⑨添加GridLayoutManager分割线（用于显示GridLayoutManager布局、staggeredGridLayoutManager布局）
package custom;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Canvas;import android.graphics.Rect;import android.graphics.drawable.Drawable;import android.support.v7.widget.GridLayoutManager;import android.support.v7.widget.RecyclerView;import android.support.v7.widget.StaggeredGridLayoutManager;import android.view.View;/** * Created by Dabin on 2017/10/13. * @Title GridLayoutManager  自定义分割线 */public class DividerGridItemDecoration extends RecyclerView.ItemDecoration {    private static final int[] ATTRS = new int[] { android.R.attr.listDivider };    private Drawable mDivider;    public DividerGridItemDecoration(Context context)    {        final TypedArray a = context.obtainStyledAttributes(ATTRS);        mDivider = a.getDrawable(0);        a.recycle();    }    @Override    public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state)    {        drawHorizontal(c, parent);        drawVertical(c, parent);    }    private int getSpanCount(RecyclerView parent)    {        // 列数        int spanCount = -1;        RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();        if (layoutManager instanceof GridLayoutManager)        {            spanCount = ((GridLayoutManager) layoutManager).getSpanCount();        } else if (layoutManager instanceof StaggeredGridLayoutManager)        {            spanCount = ((StaggeredGridLayoutManager) layoutManager)                    .getSpanCount();        }        return spanCount;    }    public void drawHorizontal(Canvas c, RecyclerView parent)    {        int childCount = parent.getChildCount();        for (int i = 0; i < childCount; i++)        {            final View child = parent.getChildAt(i);            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child                    .getLayoutParams();            final int left = child.getLeft() - params.leftMargin;            final int right = child.getRight() + params.rightMargin                    + mDivider.getIntrinsicWidth();            final int top = child.getBottom() + params.bottomMargin;            final int bottom = top + mDivider.getIntrinsicHeight();            mDivider.setBounds(left, top, right, bottom);            mDivider.draw(c);        }    }    public void drawVertical(Canvas c, RecyclerView parent)    {        final int childCount = parent.getChildCount();        for (int i = 0; i < childCount; i++)        {            final View child = parent.getChildAt(i);            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child                    .getLayoutParams();            final int top = child.getTop() - params.topMargin;            final int bottom = child.getBottom() + params.bottomMargin;            final int left = child.getRight() + params.rightMargin;            final int right = left + mDivider.getIntrinsicWidth();            mDivider.setBounds(left, top, right, bottom);            mDivider.draw(c);        }    }    private boolean isLastColum(RecyclerView parent, int pos, int spanCount,                                int childCount)    {        RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();        if (layoutManager instanceof GridLayoutManager)        {            if ((pos + 1) % spanCount == 0)// 如果是最后一列，则不需要绘制右边            {                return true;            }        } else if (layoutManager instanceof StaggeredGridLayoutManager)        {            int orientation = ((StaggeredGridLayoutManager) layoutManager)                    .getOrientation();            if (orientation == StaggeredGridLayoutManager.VERTICAL)            {                if ((pos + 1) % spanCount == 0)// 如果是最后一列，则不需要绘制右边                {                    return true;                }            } else            {                childCount = childCount - childCount % spanCount;                if (pos >= childCount)// 如果是最后一列，则不需要绘制右边                    return true;            }        }        return false;    }    private boolean isLastRaw(RecyclerView parent, int pos, int spanCount,                              int childCount)    {        RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();        if (layoutManager instanceof GridLayoutManager)        {            childCount = childCount - childCount % spanCount;            if (pos >= childCount)// 如果是最后一行，则不需要绘制底部                return true;        } else if (layoutManager instanceof StaggeredGridLayoutManager)        {            int orientation = ((StaggeredGridLayoutManager) layoutManager)                    .getOrientation();            // StaggeredGridLayoutManager 且纵向滚动            if (orientation == StaggeredGridLayoutManager.VERTICAL)            {                childCount = childCount - childCount % spanCount;                // 如果是最后一行，则不需要绘制底部                if (pos >= childCount)                    return true;            } else            // StaggeredGridLayoutManager 且横向滚动            {                // 如果是最后一行，则不需要绘制底部                if ((pos + 1) % spanCount == 0)                {                    return true;                }            }        }        return false;    }    @Override    public void getItemOffsets(Rect outRect, int itemPosition,                               RecyclerView parent)    {        int spanCount = getSpanCount(parent);        int childCount = parent.getAdapter().getItemCount();        if (isLastRaw(parent, itemPosition, spanCount, childCount))// 如果是最后一行，则不需要绘制底部        {            outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);        } else if (isLastColum(parent, itemPosition, spanCount, childCount))// 如果是最后一列，则不需要绘制右边        {            outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());        } else        {            outRect.set(0, 0, mDivider.getIntrinsicWidth(),                    mDivider.getIntrinsicHeight());        }    }}
⑩清单文件中（一些权限和MyApp的引用）
<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.dabin.www.recycleview01">    <uses-permission android:name="android.permission.INTERNET"/>    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>    <application        android:name="app.MyApp"        android:allowBackup="true"        android:icon="@mipmap/ic_launcher"        android:label="Dabin"        android:supportsRtl="true"        android:theme="@style/AppTheme">        <activity android:name=".MainActivity">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application></manifest>

OK就完成了以上操作。
查看源码GIthubhttps://github.com/Dabinai/RecycleView