微信截图_20191202161856.png

![瀑布流的效果图，至于刷新加载的动效，就暂时没有录啦，为方便你直接copy使用，所以都是设的文字---图片你难得找]

先来说说思路

首先，瀑布流的布局跟上拉加载和下拉刷新是两个独立的东西，两者并没有半毛钱关系，不是只有列表类的东西才能刷新加载。

然后说说我的引用

就recyclerView的使用来说，我觉得这篇例子写的比我好
我是传送门
关于刷新加载的动画及其他，可看github源码
我是传送门

然后说代码，总共需要五个文件

步骤一

引入刷新加载的库及recyclerView

implementation group: 'androidx.recyclerview', name: 'recyclerview', version: '1.1.0-alpha01'
implementation 'com.scwang.smartrefresh:SmartRefreshLayout:1.1.0-alpha-32'//刷新

创建Activity及对应的layout

activity

package com.example.test.more;

import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.RecyclerView;
import androidx.recyclerview.widget.StaggeredGridLayoutManager;

import android.os.Bundle;
import android.widget.Toast;

import com.example.test.R;
import com.scwang.smartrefresh.layout.api.RefreshLayout;
import com.scwang.smartrefresh.layout.constant.SpinnerStyle;
import com.scwang.smartrefresh.layout.footer.BallPulseFooter;
import com.scwang.smartrefresh.layout.header.BezierRadarHeader;
import com.scwang.smartrefresh.layout.listener.OnLoadMoreListener;
import com.scwang.smartrefresh.layout.listener.OnRefreshListener;

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

public class MoretestActivity extends AppCompatActivity {

    private List<More> moreList = new ArrayList<>();
    private RecyclerView recyclerView;
    private MoreAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_moretest);

        //加载数据
        init();
        //适配器布局
        recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
        StaggeredGridLayoutManager layoutManager = new StaggeredGridLayoutManager(3, StaggeredGridLayoutManager.VERTICAL);
        recyclerView.setLayoutManager(layoutManager);
        adapter = new MoreAdapter(moreList);
        recyclerView.setAdapter(adapter);

        //下拉刷新及上拉加载
        RefreshLayout refreshLayout = (RefreshLayout) findViewById(R.id.refreshLayout);
        //设置 Header 为 贝塞尔雷达 样式 更多样式以及自定义样式查看 github  https://github.com/scwang90/SmartRefreshLayout
        refreshLayout.setRefreshHeader(new BezierRadarHeader(this).setEnableHorizontalDrag(true));
        //设置 Footer 为 球脉冲 样式
        refreshLayout.setRefreshFooter(new BallPulseFooter(this).setSpinnerStyle(SpinnerStyle.Scale));

        refreshLayout.setOnRefreshListener(new OnRefreshListener() {
            @Override
            public void onRefresh(RefreshLayout refreshlayout) {
                //进行刷新过程的逻辑操作，次数刷新在已有数据头部装载数据，完成后调用finishRefresh方法
                boolean aa = initRefresh();
                if (aa) {
                    //数据装载成功的逻辑
                    refreshlayout.finishRefresh();
                    adapter.dataChange();
                    //refreshlayout.finishRefresh(1000/*,false*/);//传入false表示刷新失败,数字则是多久后关闭
                } else {
                    Toast.makeText(MoretestActivity.this, "加载失败", Toast.LENGTH_SHORT).show();
                    refreshlayout.finishRefresh(false);//传入false表示刷新失败
                }
            }
        });
        refreshLayout.setOnLoadMoreListener(new OnLoadMoreListener() {
            @Override
            public void onLoadMore(RefreshLayout refreshlayout) {
                //进行加载更多过程的逻辑操作，加载更多在已有数据尾部装载数据，完成后调用finishRefresh方法
                boolean aa = initLoadMore();
                if (aa) {
                    //数据装载成功的逻辑
                    refreshlayout.finishLoadMore();
                    adapter.dataChange();
                    //refreshlayout.finishRefresh(1000/*,false*/);//传入false表示刷新失败,数字则是多久后关闭
                } else {
                    Toast.makeText(MoretestActivity.this, "加载失败", Toast.LENGTH_SHORT).show();
                    refreshlayout.finishRefresh(false);//传入false表示刷新失败
                }
            }
        });

    }

    //初始化数据
    private void init() {
        for (int i = 0; i < 3; i++) {
            More aa = new More(getRandomLengthName("aaaa"));
            moreList.add(aa);
            More bb = new More(getRandomLengthName("bbbb"));
            moreList.add(bb);
            More cc = new More(getRandomLengthName("cccc"));
            moreList.add(cc);
            More dd = new More(getRandomLengthName("dddd"));
            moreList.add(dd);
            More ee = new More(getRandomLengthName("eeee"));
            moreList.add(ee);
            More ff = new More(getRandomLengthName("ffff"));
            moreList.add(ff);
            More gg = new More(getRandomLengthName("gggg"));
            moreList.add(gg);
        }
    }

    //上拉加载时装载的数据，需装入数据尾部
    private boolean initLoadMore() {
        List<More> loadList = new ArrayList<>();
        for (int i = 0; i < 3; i++) {
            More aa = new More(getRandomLengthName("1111"));
            loadList.add(aa);
            More bb = new More(getRandomLengthName("2222"));
            loadList.add(bb);
            More cc = new More(getRandomLengthName("3333"));
            loadList.add(cc);
            More dd = new More(getRandomLengthName("4444"));
            loadList.add(dd);
            More ee = new More(getRandomLengthName("5555"));
            loadList.add(ee);
            More ff = new More(getRandomLengthName("6666"));
            loadList.add(ff);
            More gg = new More(getRandomLengthName("7777"));
            loadList.add(gg);
        }
        //由于需装入尾部，所以以moreList为主,需返回装载结果来判断是否加载成功
        boolean a = moreList.addAll(loadList);
        return a;
    }

    //下拉刷新时装载的数据，需装入数据头部
    private boolean initRefresh() {
        List<More> refreshList = new ArrayList<>();
        for (int i = 0; i < 3; i++) {
            More aa = new More(getRandomLengthName("qqqq"));
            refreshList.add(aa);
            More bb = new More(getRandomLengthName("wwww"));
            refreshList.add(bb);
            More cc = new More(getRandomLengthName("pppp"));
            refreshList.add(cc);
            More dd = new More(getRandomLengthName("llll"));
            refreshList.add(dd);
            More ee = new More(getRandomLengthName("oooo"));
            refreshList.add(ee);
            More ff = new More(getRandomLengthName("uuuu"));
            refreshList.add(ff);
            More gg = new More(getRandomLengthName("yyyy"));
            refreshList.add(gg);
        }
        //由于需装入尾部，所以以moreList为主,需返回装载结果来判断是否加载成功
        boolean a = refreshList.addAll(moreList);
        //注意数据添加数据的方式，不能直接=,要先将原数组清空，再添加
        moreList.clear();
        moreList.addAll(refreshList);
        return a;
    }


    /**
     * 根据name产生随机长度的字符串
     *
     * @param name 母字符串
     * @return 加长版的字符串
     */
    private String getRandomLengthName(String name) {
        Random random = new Random();
        int length = random.nextInt(20) + 1;  // 产生1-20的随机数
        StringBuilder builder = new StringBuilder();//此处有StringBuilder和StringBuffer类可用，两者都可append数据，前者更快，后者是同步的 即线程安全
        for (int i = 0; i < length; i++) {
            builder.append(name);
        }
        return builder.toString();//添加完成后需转换为字符串
    }

}

layout

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".more.MoretestActivity">

    <com.scwang.smartrefresh.layout.SmartRefreshLayout
        android:id="@+id/refreshLayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintStart_toStartOf="parent">
        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/recycler_view"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>

    </com.scwang.smartrefresh.layout.SmartRefreshLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

创建adapter及recyclerView所使用的样式layout及数据类

adapter

package com.example.test.more;


import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;

import androidx.recyclerview.widget.RecyclerView;

import com.example.test.R;

import java.util.List;

public class MoreAdapter extends RecyclerView.Adapter<MoreAdapter.ViewHolder> {

    private List<More> moreList;

    static class ViewHolder extends RecyclerView.ViewHolder {
        View moreView;
        TextView moreName;

        ViewHolder(View view) {
            super(view);
            moreView = view;
            moreName = (TextView) view.findViewById(R.id.morename);
        }

    }

    MoreAdapter(List<More> fruitList) {
        moreList = fruitList;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.more_item, parent, false);
        final ViewHolder holder = new ViewHolder(view);
        holder.moreView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                int position = holder.getAdapterPosition();
                More fruit = moreList.get(position);
                Toast.makeText(view.getContext(), "you clicked view" + fruit.getName(), Toast.LENGTH_SHORT).show();
            }
        });


        //此处留该部分注释掉代码是说明在recyclerView中，同一块view内的不同控件可以设置不同的点击事件，于本次测试并没什么卵用
//        holder.fruitImage.setOnClickListener(new View.OnClickListener() {
//            @Override
//            public void onClick(View view) {
//                int position = holder.getAdapterPosition();
//                Fruit fruit = mFruitList.get(position);
//                Toast.makeText(view.getContext(), "you clicked image" + fruit.getName(), Toast.LENGTH_SHORT).show();
//            }
//        });
        return holder;
    }


    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        More more = moreList.get(position);
        holder.moreName.setText(more.getName());
    }

    @Override
    public int getItemCount() {
        return moreList.size();
    }

    //数据改变后刷新数据
    void dataChange() {
//        刷新全部可见的item，notifyDataSetChanged()
//        刷新指定item，notifyItemChanged(int)
//        从指定位置开始刷新指定个item，notifyItemRangeChanged(int,int)
//        插入、移动一个并自动刷新，notifyItemInserted(int)、notifyItemMoved(int)、notifyItemRemoved(int)
//        局部刷新，notifyItemChanged(int, Object)
        notifyDataSetChanged();
    }

}

样式layout

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="#419991"
        android:id="@+id/morename"
        android:layout_marginTop="@dimen/dp_10"
        android:layout_marginStart="@dimen/dp_10"
        android:layout_marginEnd="@dimen/dp_10"/>
</LinearLayout>

数据类

package com.example.test.more;

public class More {
    private String name;

    public String getName() {
        return name;
    }

    public More(String name){
        this.name = name;
    }
}

完工！关于文件名和注意事项我都已经写在代码注释中啦，告辞！