[移动开发]简单记录一下，recyclerView上拉加载，下拉刷新

首先添加的依赖：

implementation 'com.github.CymChad:BaseRecyclerViewAdapterHelper:2.9.30'
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

第二设置上拉加载，下拉刷新的头部和尾部。

static {
    //设置全局的Header构建器
    SmartRefreshLayout.setDefaultRefreshHeaderCreater(new DefaultRefreshHeaderCreater() {
        @Override
        public RefreshHeader createRefreshHeader(Context context, RefreshLayout layout) {
            layout.setPrimaryColorsId(R.color.colorPrimary, android.R.color.black);//全局设置主题颜色
            return new ClassicsHeader(context);//.setTimeFormat(new DynamicTimeFormat("更新于 %s"));//指定为经典Header，默认是 贝塞尔雷达Header
        }
    });
    //设置全局的Footer构建器
    SmartRefreshLayout.setDefaultRefreshFooterCreater(new DefaultRefreshFooterCreater() {
        @Override
        public RefreshFooter createRefreshFooter(Context context, RefreshLayout layout) {
            //指定为经典Footer，默认是 BallPulseFooter
            return new ClassicsFooter(context).setDrawableSize(20);
        }
    });
}

设置在application中。

三：简单的demo

只要记住两个点：1.上拉加载要累加数据，调用的方法为addData.

? ? ? ? ? ? ? ? ? ? ? ? ? ? ?2.下拉刷新，要记住list要clear之前的数据，并且调用方法为setNewData.

具体代码如下所示：

package com.example.testforlistdemo.activity;

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

import android.app.Activity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;

import com.chad.library.adapter.base.BaseQuickAdapter;
import com.example.testforlistdemo.R;
import com.example.testforlistdemo.adapter.TestAdapter;
import com.example.testforlistdemo.app.MyApp;
import com.example.testforlistdemo.bean.TestBean;
import com.scwang.smartrefresh.layout.SmartRefreshLayout;
import com.scwang.smartrefresh.layout.api.RefreshLayout;
import com.scwang.smartrefresh.layout.listener.OnLoadmoreListener;
import com.scwang.smartrefresh.layout.listener.OnRefreshListener;

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

public class MainActivity extends Activity implements OnRefreshListener, OnLoadmoreListener, BaseQuickAdapter.OnItemClickListener {
    private RecyclerView recyclerViewTest;
    private SmartRefreshLayout smartRefreshLayout;
    private View emptyView;
    private int page=1;
    private List<TestBean>beanList;
    private TestAdapter testAdapter;


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


    public void init(){
        recyclerViewTest=findViewById(R.id.recyclerViewTest);
        smartRefreshLayout=findViewById(R.id.smart);
        emptyView= LayoutInflater.from(this).inflate(R.layout.empty_layout,null);
        beanList=new ArrayList<>();
        for (int i=0;i<10;i++){
            TestBean bean=new TestBean();
            bean.setNumber("刷新的第 "+(i+1)+"项");
            beanList.add(bean);
        }
        testAdapter=new TestAdapter(R.layout.item_test_layout,beanList);
        LinearLayoutManager linearLayoutManager=new LinearLayoutManager(this);
        linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
        recyclerViewTest.setLayoutManager(linearLayoutManager);
        recyclerViewTest.setAdapter(testAdapter);
        testAdapter.setEnableLoadMore(false);
        smartRefreshLayout.setOnLoadmoreListener(this);
        smartRefreshLayout.setOnRefreshListener(this);
        testAdapter.setOnItemClickListener(this);

    }


    @Override
    public void onLoadmore(RefreshLayout refreshlayout) {
        page++;
        List<TestBean>list=new ArrayList<>();
        TestBean bean=new TestBean();
        bean.setNumber("新增的第 "+page+"项");
        list.add(bean);
        testAdapter.addData(list);
        smartRefreshLayout.finishLoadmore(500);
        if (page>=5){
            smartRefreshLayout.setEnableLoadmore(false);
        }else {
            smartRefreshLayout.setEnableLoadmore(true);
        }

    }

    @Override
    public void onRefresh(RefreshLayout refreshlayout) {
        page=1;
        //刷新显示5条数据
        beanList.clear();
        for (int i=0;i<10;i++){
            TestBean bean=new TestBean();
            bean.setNumber("刷新的第 "+(i+1)+"项");
            beanList.add(bean);
        }
        testAdapter.setNewData(beanList);
        smartRefreshLayout.finishRefresh(500);
        smartRefreshLayout.setEnableLoadmore(true);
    }

    @Override
    public void onItemClick(BaseQuickAdapter adapter, View view, int position) {
        MyApp.showToastShort("点击的是"+position);
    }
}

?

import java.util.List;

/**
  *
  * @ClassName:      TestAdapter
  * @Description:     数据adapter
  * @Author:         
  * @CreateDate:     2021/7/22 15:55
  * @UpdateUser:     更新者：
  * @UpdateDate:     2021/7/22 15:55
  * @UpdateRemark:   更新说明：
  * @Version:        1.0
 */
public class TestAdapter extends BaseQuickAdapter<TestBean, BaseViewHolder> {
    public TestAdapter(int layoutResId, @Nullable List<TestBean> data) {
        super(layoutResId, data);
    }

    @Override
    protected void convert(BaseViewHolder helper, TestBean item) {
      helper.setText(R.id.tvName,item.getNumber()) ;
    }
}

谨以此文，记录一下。

?