android列表数据展示处理逻辑

1.使用的是BaseQuickAdapter+RecyclerView+SmartRefreshLayout

//BaseQuickAdapter
api 'com.github.CymChad:BaseRecyclerViewAdapterHelper:2.9.49'
//SmartRefreshLayout
implementation  'com.scwang.smart:refresh-layout-kernel:2.0.3'      //核心必须依赖
    implementation  'com.scwang.smart:refresh-header-classics:2.0.3'    //经典刷新头
    implementation  'com.scwang.smart:refresh-header-material:2.0.0-alpha-1'    //谷歌刷新头

2.布局

<?xml version="1.0" encoding="utf-8"?>
<com.scwang.smart.refresh.layout.SmartRefreshLayout
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:android="http://schemas.android.com/apk/res/android"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    android:id="@+id/smartRefreshLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <androidx.recyclerview.widget.RecyclerView
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        android:id="@+id/recyclerView"
        android:overScrollMode="never"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
</com.scwang.smart.refresh.layout.SmartRefreshLayout>

3.初始化和处理逻辑

public abstract class BaseListActivity<T,K extends BaseQuickAdapter> extends BaseActivity{
protected K adapter;
protected List<T> list=new ArrayList<>();
protected int pageNum = 1;//页码
protected int pageSize=10;//每页的个数
protected RecyclerView.LayoutManager layoutManager;
protected View emptyView;//空数据布局
protected abstract void loadMore();
protected abstract void refresh();
protected RecyclerView recyclerView;
protected SmartRefreshLayout smartRefreshLayout;
protected View headView;//头部布局
protected void initRecyclerViewsWithEmptyView(){
        if(adapter==null){
            //请先初始化adapter
            //throw new NullPointerException("请先初始化adapter");
            return;
        }
        recyclerView=findViewById(R.id.recyclerView);
        smartRefreshLayout=findViewById(R.id.smartRefreshLayout);
        //smartRefreshLayout.setHasFixedSize(true);
        smartRefreshLayout.setNestedScrollingEnabled(false);
        //默认LinearLayoutManager
        if(layoutManager==null){
            layoutManager=new LinearLayoutManager(mContext);
        }
        recyclerView.setLayoutManager(layoutManager);
        if(headView!=null){
            adapter.addHeaderView(headView);
        }

       if(emptyView==null){
           // ViewGroup.LayoutParams layoutParams = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
            View defaultEmptyView = LayoutInflater.from(this).inflate(R.layout.common_layout_cart_empty_error, null);
            //defaultEmptyView.setLayoutParams(layoutParams);
            TextView emptyText = defaultEmptyView.findViewById(R.id.tv_empty_msg);
            emptyText.setText(emptyStr);
            adapter.bindToRecyclerView(recyclerView);
            adapter.setEmptyView(defaultEmptyView);
            //adapter.setEmptyView(R.layout.common_layout_cart_empty_error,recyclerView);
        }else{
            adapter.bindToRecyclerView(recyclerView);
            adapter.setEmptyView(emptyView);
        }
        recyclerView.setAdapter(adapter);
        smartRefreshLayout.setRefreshHeader(new ClassicsHeader(mContext));
        smartRefreshLayout.setRefreshFooter(new ClassicsFooter(mContext));
        smartRefreshLayout.setOnRefreshListener(new OnRefreshListener() {
            @Override
            public void onRefresh(RefreshLayout refreshlayout) {
                //refreshlayout.finishRefresh(2000/*,false*/);//传入false表示刷新失败
                refresh();
            }
        });
        smartRefreshLayout.setOnLoadMoreListener(new OnLoadMoreListener() {
            @Override
            public void onLoadMore(RefreshLayout refreshlayout) {
                //refreshlayout.finishLoadMore(2000/*,false*/);//传入false表示加载失败
                //当第一页充满时才加载第二页
                if(list.size()>=pageSize){
                    loadMore();
                }else{
                    smartRefreshLayout.finishLoadMoreWithNoMoreData();
                }
            }
        });
        //smartRefreshLayout.setOnRefreshListener(refreshlayout -> refresh());
        //smartRefreshLayout.setOnLoadMoreListener(refreshlayout -> loadMore());
//与上面一个二选一，
        adapter.setOnLoadMoreListener(() -> {
            loadMore();
//        adapter.loadMoreFail();
//        adapter.loadMoreEnd();
//        adapter.loadMoreComplete();
        });
    }
    /**
     * 回调失败的处理,针对有上拉加载，下拉刷新的情况
     */
    protected void showErrorView(boolean isRefresh){
        if(isRefresh){//pageNum == 1
            smartRefreshLayout.finishRefresh();
        }else{
            smartRefreshLayout.finishLoadMoreWithNoMoreData();
        }
    }
    /**
     * 成功回调的处理
     * @param isRefresh
     * @param result
     */
    protected void showSuccessView(boolean isRefresh,List<T> result){
        //第一种写法
        if(isRefresh){
            //smartRefreshLayout.resetNoMoreData();
            smartRefreshLayout.setNoMoreData(false);
            smartRefreshLayout.finishRefresh();
            list.clear();
            if (null != result && result.size() != 0) {
                //smartRefreshLayout.setVisibility(View.VISIBLE);
                if (result.size() < pageSize){
                    smartRefreshLayout.setEnableLoadMore(true);
                }else {
                    smartRefreshLayout.setEnableLoadMore(false);
                }
                list.addAll(result);
            }
            adapter.notifyDataSetChanged();
        }else{//加载更多
            //smartRefreshLayout.setVisibility(View.VISIBLE);
            if (null != result && result.size() != 0) {
                if (result.size() < pageSize){
                    smartRefreshLayout.finishLoadMoreWithNoMoreData();
                }else {
                    smartRefreshLayout.finishLoadMore();
                }
                list.addAll(result);
                adapter.notifyDataSetChanged();
            }else{
                //smartRefreshLayout.finishLoadMoreWithNoMoreData();
                smartRefreshLayout.finishLoadMore(100,true,true);
            }
        }
        //第二种写法
        if (pageNum == 1){
            list.clear();
            smartRefreshLayout.finishRefresh();
            smartRefreshLayout.setEnableLoadMore(true);
        }else{
            smartRefreshLayout.finishLoadMore();
        }
        if(result!=null){
            if (result.size() <pageSize) {
                smartRefreshLayout.setEnableLoadMore(false);
                smartRefreshLayout.finishLoadMoreWithNoMoreData();
            }
            list.addAll(result);
        }else {
            if(pageNum>1){
                smartRefreshLayout.finishLoadMoreWithNoMoreData();
            }
        }
        adapter.notifyDataSetChanged();
    }
}

4.调用示例 kotlin：

//初始化
adapter = FactoryListAdapter(list)
initRecyclerViewsWithEmptyView()
//模拟网络请求
private fun getList(isRefresh: Boolean) {
onSuccess(data){
showSuccessView(isRefresh, data)
}
onError(){
showErrorView(isRefresh)
}
}
override fun loadMore() {
        pageNum++
        getList(false)
    }

    override fun refresh() {
        pageNum = 1
        getList(true)
    }