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 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;itrue);
                recyclerview.setPushRefreshEnable(true);
                recyclerview.setOnPullLoadMoreListener(new PullLoadMoreRecyclerView.PullLoadMoreListener() {

                    private ArrayList 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 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 list;

    public MRecyclerViewAdapter(Context context, List 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