Android 下拉刷新上啦加载SmartRefreshLayout + RecyclerView

历览千载书，时时见遗烈。这篇文章主要讲述Android 下拉刷新上啦加载SmartRefreshLayout + RecyclerView相关的知识，希望能为你提供帮助。
在弄android刷新的时候，可算是耗费了一番功夫，最后发觉有现成的控件，并且非常好用，这里记录一下。
原文是 https://blog.csdn.net/huangxin112/article/details/78781682 ，这里是看了之后，结合自己实际遇到的问题写的。
首先引入包。

//下拉框 implementation \'com.android.support:recyclerview-v7:28.0.0-beta01\' implementation \'com.scwang.smartrefresh:SmartRefreshLayout:1.0.3\' implementation \'com.scwang.smartrefresh:SmartRefreshHeader:1.0.3\'//没有使用特殊Header，可以不加这行

recyclerview 是为了数据显示用，因为在使用中，发现使用ListView 会报错，不过我看别人用成功了的，具体我也懒得去查了。

recyclerview 以后具体在学习吧，反正是个比较好用的东西就是了。
首先是页面文件 activity_main.xml

< com.scwang.smartrefresh.layout.SmartRefreshLayout 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:id="@+id/refreshLayout" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity" > < android.support.v7.widget.RecyclerView android:id="@+id/recyclerview" android:layout_width="match_parent" android:layout_height="match_parent" android:overScrollMode="never" android:background="#fff" /> < /com.scwang.smartrefresh.layout.SmartRefreshLayout>

接着是具体的布局显示文件： item.xml

< ?xml version="1.0" encoding="utf-8"?> < LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="60dp" android:gravity="center"> < ImageView android:id="@+id/iv_image" android:layout_width="60dp" android:layout_height="60dp" android:gravity="center" android:background="@mipmap/ic_launcher"> < /ImageView> < LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> < TextView android:id="@+id/tv_title" android:layout_width="match_parent" android:layout_height="30dp" android:text="title" android:gravity="center" > < /TextView> < TextView android:id="@+id/tv_content" android:layout_width="match_parent" android:layout_height="30dp" android:text="content1231231231232323" android:gravity="center" > < /TextView> < /LinearLayout> < /LinearLayout>

显示的bean 对象，

package com.example.administrator.shuaxin; public class ItemBean { int itemImage; String itemTitle; String itemContent; public ItemBean(int itemImage , String itemTitle, String itemContent) { this.itemTitle = itemTitle; this.itemContent = itemContent; this.itemImage = itemImage; }}

适配器MyAdapter：

package com.example.administrator.shuaxin; 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.List; public class MyAdapter extends RecyclerView.Adapter< MyAdapter.ViewHolder> { private List< ItemBean> mList; static class ViewHolder extends RecyclerView.ViewHolder{ View myView; ImageView imageView; TextView title; TextView content; public ViewHolder(View itemView) { super(itemView); myView = itemView; imageView = (ImageView) itemView.findViewById(R.id.iv_image); title = (TextView) itemView.findViewById(R.id.tv_title); content = (TextView) itemView.findViewById(R.id.tv_content); } }public MyAdapter(List< ItemBean> list){ this.mList = list; }@Override public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item,null); final ViewHolder holder = new ViewHolder(view); return holder; }//将数据绑定到控件上 @Override public void onBindViewHolder(ViewHolder holder, int position) { ItemBean bean = mList.get(position); holder.imageView.setBackgroundResource(bean.itemImage); holder.title.setText(bean.itemTitle); holder.content.setText(bean.itemContent); }@Override public int getItemCount() { return mList.size(); }//下面两个方法提供给页面刷新和加载时调用 public void add(List< ItemBean> addMessageList) { //增加数据 int position = mList.size(); mList.addAll(position, addMessageList); notifyItemInserted(position); }public void refresh(List< ItemBean> newList) { //刷新数据 mList.removeAll(mList); mList.addAll(newList); notifyDataSetChanged(); } }

然后是Activity文件。

package com.example.administrator.shuaxin; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import com.scwang.smartrefresh.header.MaterialHeader; import com.scwang.smartrefresh.layout.api.RefreshLayout; import com.scwang.smartrefresh.layout.footer.ClassicsFooter; import com.scwang.smartrefresh.layout.header.ClassicsHeader; import com.scwang.smartrefresh.layout.listener.OnLoadmoreListener; import com.scwang.smartrefresh.layout.listener.OnRefreshListener; import java.util.ArrayList; import java.util.Date; import java.util.List; public class MainActivity extends AppCompatActivity {private List< ItemBean> list; private MyAdapter myAdapter; private RecyclerView recyclerView; RefreshLayout refreshLayout; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); refreshLayout = (RefreshLayout)findViewById(R.id.refreshLayout); //初始数据加载 initDate(); //刷新数据加载 setPullRefresher(); }private void initDate(){ list = new ArrayList< ItemBean> (); for (int i=0; i< 20; i++){ list.add(new ItemBean( R.mipmap.ic_launcher, "initTitle"+i, new Date().toString()+"" )); } myAdapter = new MyAdapter(list); recyclerView = (RecyclerView) findViewById(R.id.recyclerview); LinearLayoutManager layoutManager = new LinearLayoutManager(this); //纵向线性布局recyclerView.setLayoutManager(layoutManager); recyclerView.setAdapter(myAdapter); }private void setPullRefresher(){ //设置 Header 为 MaterialHeader //设置 Header 为 ClassicsFooter 比较经典的样式 refreshLayout.setRefreshHeader(new ClassicsHeader(this)); //设置 Footer 为经典样式 refreshLayout.setRefreshFooter(new ClassicsFooter(this)); refreshLayout.setOnRefreshListener(new OnRefreshListener() { @Override public void onRefresh(RefreshLayout refreshlayout) { //在这里执行上拉刷新时的具体操作(网络请求、更新UI等)//模拟网络请求到的数据 ArrayList< ItemBean> newList = new ArrayList< ItemBean> (); for (int i=0; i< 20; i++){ newList.add(new ItemBean( R.mipmap.ic_launcher, "newTitle"+i, new Date().toString()+"" )); } myAdapter.refresh(newList); refreshlayout.finishRefresh(2000/*,false*/); //不传时间则立即停止刷新传入false表示刷新失败 } }); refreshLayout.setOnLoadmoreListener(new OnLoadmoreListener() { @Override public void onLoadmore(RefreshLayout refreshlayout) {//模拟网络请求到的数据 ArrayList< ItemBean> newList = new ArrayList< ItemBean> (); for (int i=0; i< 20; i++){ newList.add(new ItemBean( R.mipmap.ic_launcher, "addTitle"+i, new Date().toString()+"" )); } myAdapter.add(newList); //在这里执行下拉加载时的具体操作(网络请求、更新UI等) refreshlayout.finishLoadmore(2000/*,false*/); //不传时间则立即停止刷新传入false表示加载失败 } }); } }

看下效果。