一.下拉刷新
话不多说，前段时间做项目的时候刚用到过，分享出来集思广益，欢迎指出不足。本文主要利用SwipeRefreshLayout嵌套Recycleview实现简单的下拉刷新功能。
1.XML文件：
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <android.support.v4.widget.SwipeRefreshLayout android:id="@+id/swiperefreshlayout" android:layout_width="match_parent" android:layout_height="wrap_content"> <android.support.v7.widget.RecyclerView android:id="@+id/recyclerView" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_centerVertical="true" android:scrollbars="vertical" /> </android.support.v4.widget.SwipeRefreshLayout></LinearLayout>
2.代码：Activity的OnCreate方法里只要添加几行代码就可实现下拉刷新的效果
swiperefreshlayout.setOnRefreshListener(this); swiperefreshlayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() { @Override public void onRefresh() { //发送网络请求 sendRequest(); //停止刷新 swiperefreshlayout.setRefreshing(false); //刷新RecycleView mRecycleViewAdapter.notifyDataSetChanged(); } });二.上拉加载更多
看过网上很多关于上拉加载更多的文章，最后总结测试了一下，就有了适合自己的简单的上拉加载更多。主要采用Recycleview设置一个FootViewHolder，并监听Recycleview的滑动状态来实现效果。直接贴代码吧（Copy不能运行，只能自己截取有用的部分加以利用，耐着性子看完，相信会有收获哦）
1.XML文件：
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <android.support.v4.widget.SwipeRefreshLayout android:id="@+id/swiperefreshlayout" android:layout_width="match_parent" android:layout_height="wrap_content"> <android.support.v7.widget.RecyclerView android:id="@+id/recyclerView" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_centerVertical="true" android:scrollbars="vertical" /> </android.support.v4.widget.SwipeRefreshLayout>2.代码(主要为网络请求到的数据Copy无效，其他各位看官随意蹂躏)：
1.Activity: public class MyActivity extends AppCompatActivity { private NoticeAdapter adapter; private RecyclerView noticeRecyclerview; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); initData(); } private void initData() { //news为你第一次发送网络请求获取到的List集合,这里就不贴了 adapter = new NoticeAdapter(this,news); LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this); noticeRecyclerview.setLayoutManager(linearLayoutManager); noticeRecyclerview.setAdapter(adapter); noticeRecyclerview.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.VERTICAL)); noticeRecyclerview.addOnScrollListener(monScrollListener); adapter.notifyDataSetChanged(); } //本段可直接Copy，作用是监听Recycleview是否滑动到底部 private int mLastVisibleItemPosition; private RecyclerView.OnScrollListener monScrollListener = new RecyclerView.OnScrollListener() { @Override public void onScrollStateChanged(RecyclerView recyclerView, int newState) { RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager(); if (layoutManager instanceof LinearLayoutManager) { mLastVisibleItemPosition = ((LinearLayoutManager) layoutManager).findLastVisibleItemPosition(); } if (adapter != null) { if (newState == RecyclerView.SCROLL_STATE_IDLE && mLastVisibleItemPosition + 1 == adapter.getItemCount()) { //发送网络请求获取更多数据 sendMoreRequest(); } } } }; private void sendMoreRequest() { //可直接查看下面onResponse方法，网络请求操作不必细看 String url = Constant.BaseUrl + "getNews"; final String s = MD5Tools.MD5(MD5Tools.MD5("NEW")); OkHttpUtils.post().url(url) .addParams("FKEY", s) .build() .execute(new StringCallback() { @Override public void onError(Call call, Exception e, int id) { } @Override public void onResponse(String response, int id) { NoticeBean noticeBean = new Gson().fromJson(response.toString(), NoticeBean.class); //result == 1表示请求成功 if (noticeBean.getResult()== 1){ //判断请求的数据集合是否不为空 if (noticeBean.getNews().size()!=0){ //不为空，则添加数据 adapter.addList(noticeBean.getNews()); }else { //为空，则调用adapter里面的方法隐藏FootView adapter.setIsLoadMore(); } } } }); }}
2.Adapter:
public class NoticeAdapter extends RecyclerView.Adapter{ private List<NoticeBean.NewsBean> list; private Context mContext; //上拉加载更多布局 public static final int view_Foot = 1; //主要布局 public static final int view_Normal = 2; //是否隐藏 public boolean isLoadMore = false; public NoticeAdapter(Context mContext, List<NoticeBean.NewsBean> list) { this.list = list; this.mContext = mContext; } @Override public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { if (viewType ==view_Normal ){ NoticeItemView noticeItemView = new NoticeItemView(mContext); NoticeViewHolder viewHolder = new NoticeViewHolder(noticeItemView); return viewHolder; }else { FootView view = new FootView(mContext); FootViewHolder footViewHolder = new FootViewHolder(view); return footViewHolder; } } @Override public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) { if (position == getItemCount()-1){ FootView itemView = (FootView) holder.itemView; if (isLoadMore){ itemView.setData(); }else { itemView.setVisibility(View.VISIBLE); } }else { NoticeItemView itemView = (NoticeItemView) holder.itemView; itemView.setData(list.get(position)); } } @Override public int getItemCount() { return list.size()+1; } @Override public int getItemViewType(int position) { if (position == getItemCount()-1){ return view_Foot; }else { return view_Normal; } } public void addList(List<NoticeBean.NewsBean> news) { list.addAll(news); notifyDataSetChanged(); } public void setIsLoadMore() { this.isLoadMore = true; notifyDataSetChanged(); } static class NoticeViewHolder extends RecyclerView.ViewHolder { public NoticeViewHolder(View itemView) { super(itemView); } } static class FootViewHolder extends RecyclerView.ViewHolder { public FootViewHolder(View itemView) { super(itemView); } }}
3.FootView为自定义控件，NoticeItemView和FootView大同小异，就不贴代码了，FootView代码如下
public class FootView extends RelativeLayout { @BindView(R.id.foot_view_progressbar) ProgressBar footViewProgressbar; public FootView(Context context) { this(context, null); } public FootView(Context context, AttributeSet attrs) { super(context, attrs); init(); } private void init() { View.inflate(getContext(), R.layout.foot_view, this); ButterKnife.bind(this,this); } public void setData() { footViewProgressbar.setVisibility(GONE); }}
4.FootView的XML文件：
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <ProgressBar android:id="@+id/foot_view_progressbar" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal"/></LinearLayout>
四.后续会更新源码至GitHub,有兴趣的同学可关注此简书账号MiHomes。