RecyclerView的加载和刷新（使用优秀的第三方库SmartRefreshLayout）

我们在APP中经常用到的刷新功能和加载更多功能，在此之前需要了解SmartRefreshLayout，由于这个知识点很多，这里默认你已经了解过并且知道怎么用了，了解SmartRefreshLayout请自行百度搜索。这篇文章主要记录一下实现刷新和加载的一个简单例子，代码很简单。先上效果图：

下面开始贴代码，首先是需要添加的依赖。

 //recyclerview的依赖 implementation "androidx.recyclerview:recyclerview:1.1.0" // For control over item selection of both touch and mouse driven selection implementation "androidx.recyclerview:recyclerview-selection:1.1.0-rc01" //smartrefresh以及经典的头部和尾部 implementation 'com.scwang.smartrefresh:SmartRefreshLayout:1.1.0' implementation 'com.scwang.smart:refresh-header-classics:2.0.1' 

然后是Mainactivity的布局代码

<LinearLayout
    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:orientation="vertical" android:layout_height="match_parent" tools:context=".MainActivity"> <TextView
        android:layout_marginTop="10dp" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="刷新加载测试" android:layout_gravity="center" /> <com.scwang.smartrefresh.layout.SmartRefreshLayout
        android:id="@+id/smart" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_marginTop="6dp"> <com.scwang.smartrefresh.layout.header.ClassicsHeader
            android:layout_width="match_parent" android:layout_height="wrap_content" /> <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/test_rlv" android:layout_width="match_parent" android:layout_height="match_parent" /> <com.scwang.smartrefresh.layout.footer.ClassicsFooter
            android:layout_width="match_parent" android:layout_height="wrap_content" /> </com.scwang.smartrefresh.layout.SmartRefreshLayout> </LinearLayout> 

再来看看MainActivity的代码

public class MainActivity extends Activity { private SmartRefreshLayout smartRefreshLayout; private RecyclerView recyclerView; private MyAdapter myAdapter; private ArrayList<Data> list; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); list=new ArrayList<>(); initData(); myAdapter=new MyAdapter(MainActivity.this,list); recyclerView=findViewById(R.id.test_rlv); recyclerView.setLayoutManager(new LinearLayoutManager(MainActivity.this)); recyclerView.setAdapter(myAdapter); smartRefreshLayout=findViewById(R.id.smart); smartRefreshLayout.setEnableLoadMore(true); //监听下拉动作（也就是刷新）的监听器 smartRefreshLayout.setOnRefreshListener(new OnRefreshListener() { @Override public void onRefresh(@NonNull RefreshLayout refreshLayout) { //刷新的逻辑是，每次触发刷新的动作时便重新请求一遍后端接口更新数据， //本例中由于数据不是从后端动态获取的故不再刷新，直接结束刷新 smartRefreshLayout.finishRefresh(); } }); //监听上滑动作（也就是加载更多）的监听器 smartRefreshLayout.setOnLoadMoreListener(new OnLoadMoreListener() { @Override public void onLoadMore(@NonNull RefreshLayout refreshLayout) { for (int i=0;i<1;i++){ list.add(list.size(),new Data("Apple","SSSSSSSS")); } //同样由于数据是自己写的，故直接每次加载添加一个数据项到列表的结尾，经过试验 //同时加载好多项也可以实现，就是把for循环改多一些 myAdapter.notifyItemInserted(list.size()); myAdapter.notifyDataSetChanged(); smartRefreshLayout.finishLoadMore(); } }); } private void initData() { for (int i=0;i<5;i++){ Data data1=new Data("华为","中华有为"); list.add(data1); } } } 

最后是MyAdapter的代码（其他的比如Data实体类的代码和recyclerView子项的布局代码就省略啦），适配器的代码也非常简单。

public class MyAdapter extends RecyclerView.Adapter { private Activity activity; private ArrayList<Data> list; public MyAdapter(Activity activity,ArrayList<Data> list){ this.activity=activity; this.list=list; } @NonNull @Override public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) { return new MyViewHolder(LayoutInflater.from(activity).inflate(R.layout.item_view,parent,false)); } @Override public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) { ((MyViewHolder)holder).name.setText(list.get(position).getName()); ((MyViewHolder)holder).info.setText(list.get(position).getInfo()); } @Override public int getItemCount() { return list.size(); } public class MyViewHolder extends RecyclerView.ViewHolder{ public TextView name,info; public MyViewHolder(@NonNull View itemView) { super(itemView); name=itemView.findViewById(R.id.str1); info=itemView.findViewById(R.id.str2); } } } 

本文地址：https://blog.csdn.net/cj19960617/article/details/107716118