RecyclerView实现上拉加载和下拉刷新

RecyclerView 没有为我们提供刷新加载功能，这时我们只能自己封装或者去网上找
一些依赖来帮助我们去实现效果，这里为大家提供了用依赖来实现的发。

首先需要添加依赖：

 compile 'com.wuxiaolong.pullloadmorerecyclerview:library:1.0.4'

添加完依赖之后可以看一下控件

     <com.wuxiaolong.pullloadmorerecyclerview.PullLoadMoreRecyclerView         android:id="@+id/pullloadmorerecyclerview"         android:layout_width="match_parent"         android:layout_height="match_parent"         android:layout_below="@id/topBar"         >     </com.wuxiaolong.pullloadmorerecyclerview.PullLoadMoreRecyclerView>

这个控件是对RecyclerView的一个封装其中包含着上拉加载下拉刷新功能

可以看一下API的一些调用，在这里我是在Fragment中做的

public class Fragment_A extends Fragment {    private int pager=1;    private View view;    private ViewGroup parent;    private MRecyclerViewAdapter adapter;    private Handler handler=new Handler(){        private ArrayList<DataBeans.DataBean> dataBeen;        private DataBeans dataBeans;        @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);            if(msg.what==0){                String json= (String) msg.obj;                Gson gson=new Gson();                dataBeans = gson.fromJson(json, DataBeans.class);                  if(pager==1){                      dataBeen = new ArrayList<>();                  }                /**                 *  通过jsonBean中的集合，循环放入新的集合                 */                  for (int i=0;i<dataBeans.getData().size();i++){                      dataBeen.add(dataBeans.getData().get(i));                  }                getInfo(dataBeen);                recyclerview.setLinearLayout();                recyclerview.setPullRefreshEnable(true);                recyclerview.setPushRefreshEnable(true);                recyclerview.setOnPullLoadMoreListener(new PullLoadMoreRecyclerView.PullLoadMoreListener() {                    private ArrayList<DataBeans> list;                    @Override                    public void onRefresh() {                        //刷新                        handler.postDelayed(new Runnable() {                            @Override                            public void run() {                               recyclerview.setPullLoadMoreCompleted();                                Toast.makeText(getActivity(), "刷新成功", Toast.LENGTH_SHORT).show();                            }                        },2000);                    }                    @Override                    public void onLoadMore() {                       //加载                        pager++;                        getData();                        handler.postDelayed(new Runnable() {                            @Override                            public void run() {                                recyclerview.setPullLoadMoreCompleted();                                Toast.makeText(getActivity(), "加载成功", Toast.LENGTH_SHORT).show();                            }                        },2000);                    }                });            }        }    };    private PullLoadMoreRecyclerView recyclerview;    private boolean net;    @Nullable    @Override    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {       if(view==null){           view = View.inflate(getActivity(), R.layout.fragment_a,null);       }        parent = (ViewGroup) view.getParent();        if(parent!=null){            parent.removeView(view);        }        return view;    }    @Override    public void onActivityCreated(@Nullable Bundle savedInstanceState) {        super.onActivityCreated(savedInstanceState);         getid();        net = NetInfo.netinfo(getActivity());        if(net==false){            Toast.makeText(getActivity(), "请检查网络是否连接", Toast.LENGTH_SHORT).show();            return;        }else{            getData();        }        //随便保存一些数据放入sd卡        try {            String fileName = "来呀！ ";            if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {                String path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/我刚刚创建/";                File dir = new File(path);                if (!dir.exists()) {                    dir.mkdirs();                }                FileOutputStream fos = new FileOutputStream(path + fileName);                fos.write("lao shi luan ma".getBytes());                fos.close();            }        }catch (Exception e){            e.printStackTrace();        }    }    /**     * 将handler置空防止内存泄漏，OOM     */    @Override    public void onDestroy() {        super.onDestroy();        handler.removeCallbacksAndMessages(null);    }    public void getid() {        recyclerview = (PullLoadMoreRecyclerView) view.findViewById(R.id.pullloadmorerecyclerview);    }    public void getData(){        String url="http://www.yulin520.com/a2a/forum/allTypeList?sign=376C5BFC22179A1B8FF3A86D4588B29F&pageSize=10&ts=1877785007&forumType=0&page="+pager;        OkHttp3Utils.doGet(url, new Callback() {            @Override            public void onFailure(Call call, IOException e) {            }            @Override            public void onResponse(Call call, Response response) throws IOException {                String json= response.body().string();                Log.e("json",json.toString());                Message message=new Message();                message.what=0;                message.obj=json;                handler.sendMessage(message);            }        });    }    public void getInfo(List<DataBeans.DataBean> list){        if(adapter==null){            adapter = new MRecyclerViewAdapter(getActivity(),list);            recyclerview.setAdapter(adapter);        }else{            adapter.notifyDataSetChanged();        }    }}

适配器

public class MRecyclerViewAdapter extends RecyclerView.Adapter<MRecyclerViewAdapter.ViewHolder>{    private Context context;    private List<DataBeans.DataBean> list;    public MRecyclerViewAdapter(Context context, List<DataBeans.DataBean> list) {        this.context = context;        this.list = list;    }    @Override    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        View view= LayoutInflater.from(context).inflate(R.layout.recycleritem,null);        ObjectAnimator anim = ObjectAnimator.ofFloat(view,"rotationX", 0f, 360f);        // 动画的持续时间，执行多久？        anim.setDuration(1000);        anim.start();        ViewHolder viewHolder=new ViewHolder(view);        return viewHolder;    }    @Override    public void onBindViewHolder(ViewHolder holder, int position) {        Picasso.with(context).load(list.get(position).getHeadImg()).resize(200,230).into(holder.ImageView);        holder.title.setText(list.get(position).getTitle());    }    @Override    public int getItemCount() {        return list.size();    }    public class ViewHolder extends RecyclerView.ViewHolder{        private TextView title;        private  ImageView ImageView;       //找控件        public ViewHolder(View itemView) {            super(itemView);            ImageView = (ImageView) itemView.findViewById(R.id.item_image);            title = (TextView) itemView.findViewById(R.id.item_title);        }    }}

判断网络是否连接

public class NetInfo {    private static NetworkInfo networkInfo;    public static boolean netinfo(Context context){       ConnectivityManager connect= (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);        networkInfo = connect.getActiveNetworkInfo();        if(networkInfo!=null){            return true;        }        return false;    };}

这里我没有为RecyclerView添加分割线如果大家想要添加一些分割线的话可以看一下我的博客