带有滚动加载和下拉刷新的RecyclerView—AutoLoadRecyclerView

2019-11-09 15:11:20

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来源：转载

供稿：网友

代码实现

public class AutoLoadRecyclerView extends RecyclerView { PRivate loadMoreListener loadMoreListener; private AutoLoadScroller autoLoadScroller; private boolean isLoading = false; public interface loadMoreListener { void onLoadMore(); } //实现两个构造函数 public AutoLoadRecyclerView(Context context) { this(context,null); } //在布局文件中调用的方法 public AutoLoadRecyclerView(Context context, @Nullable AttributeSet attrs) { super(context, attrs); autoLoadScroller = new AutoLoadScroller(); addOnScrollListener(autoLoadScroller); }public void setLoadMoreListener(AutoLoadRecyclerView.loadMoreListener loadMoreListener) { this.loadMoreListener = loadMoreListener; } public boolean isLoading() { return isLoading; } public void setLoading(boolean loading) { isLoading = loading; } public void removeAutoScroller() { removeOnScrollListener(autoLoadScroller); }//创建自定义滑动监听，继承OnScrollListener private class AutoLoadScroller extends OnScrollListener{ @Override public void onScrolled(RecyclerView recyclerView, int dx, int dy) { super.onScrolled(recyclerView, dx, dy); //判断是否是列表排列 if(getLayoutManager() instanceof LinearLayoutManager){ //findLastVisibleItemPosition获取列表底部item对应记录下标 int lastVisiblePos = ((LinearLayoutManager)getLayoutManager()).findLastVisibleItemPosition(); //获取适配器当前页面的条目个数 int itemCount = getAdapter().getItemCount(); if (loadMoreListener != null && !isLoading && lastVisiblePos > itemCount - 2 && dy > 0) { loadMoreListener.onLoadMore(); isLoading = true; } } } } }

实现xml布局

实现展示数据

public class HomeFragment extends Fragment { @BindView(R.id.rv) AutoLoadRecyclerView rv; @BindView(R.id.refresh_layout) SwipeRefreshLayout refreshLayout; ————> 插件拓展：④插件：ButterKnife（黄油刀）——> 一键处理 findViewById控件插件 private int currPageIndex = 0; private AppAdapter adapter; @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { //1.布局xml使用code int layout = R.layout.fragment_home; //2.阅读接口文档 //3.可在调试模式获取json currPageIndex = 0; HttpUtils.get(ApiUrls.HOME + "?index=" + currPageIndex, callback); //支持下拉刷洗与滚动加载 View view = inflater.inflate(layout, container, false); ButterKnife.bind(this, view); //编写下拉刷新事件的处理 refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() { @Override public void onRefresh() { //1:清空数据 2：添加新获取首页数据 3：列表刷新 Toast.makeText(getContext(), "下拉刷新中", Toast.LENGTH_SHORT).show(); currPageIndex = 0; HttpUtils.get(ApiUrls.HOME + "?index=" + currPageIndex, callback); } }); //设置滑动加载数据事件 rv.setLoadMoreListener(new AutoLoadRecyclerView.loadMoreListener() { @Override public void onLoadMore() { if (currPageIndex == 2) { Toast.makeText(getContext(), "已经没有数据了...", Toast.LENGTH_SHORT).show(); } else { Toast.makeText(getContext(), "加载更多中", Toast.LENGTH_SHORT).show(); currPageIndex += 1; HttpUtils.get(ApiUrls.HOME + "?index=" + currPageIndex, callback); } } }); return view; } //实现回调 DefaultCallBack callback = new DefaultCallBack() { @Override public void onStart(int what) { super.onStart(what); if (currPageIndex == 0) { refreshLayout.setRefreshing(true); } } @Override public void onFinish(int what) { super.onFinish(what); if (currPageIndex == 0) { refreshLayout.setRefreshing(false); } } protected void createView(String json) { HomeWebInfo info = new Gson().fromJson(json, HomeWebInfo.class); if (currPageIndex == 0) {//首頁逻辑 if (adapter == null) { //5.高级控件的显示 rv.setLayoutManager(new LinearLayoutManager(getContext())); //创建控件，设置适配器 adapter = new AppAdapter(info.list); rv.setAdapter(adapter); } else { adapter.getData().clear();//清空之前数据 adapter.getData().addAll(info.list);//添加新获取的首页数据 adapter.notifyDataSetChanged(); Toast.makeText(getContext(), "下拉刷新成功", Toast.LENGTH_SHORT).show(); } } else { //添加下一页数据 adapter.getData().addAll(info.list); adapter.notifyDataSetChanged(); Toast.makeText(getContext(), "加载更多完成", Toast.LENGTH_SHORT).show(); //加载完成，设置loading为false可以加载下一页 rv.setLoading(false); } } };}

插件：ButterKnife（奶油刀）——> 一键处理 findViewById控件插件

1.安装插件 setting -> plugins 2.网络下载butterknife支持包 project structure -> dependencies 3.在project的build.gradle中依赖包 dependencies { classpath ‘com.android.tools.build:gradle:2.2.2’ classpath ‘com.neenbedankt.gradle.plugins:android-apt:1.8’ } 4.在app的build.gradle中首行增加 apply plugin: ‘android-apt’ dependencies { compile ‘com.jakewharton:butterknife:8.4.0’ apt ‘com.jakewharton:butterknife-compiler:8.4.0’ }

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