PullToRefresh实现下拉刷新上拉加载使用教程。。。

介绍 ：

PullToRefresh是一个非常好的刷新加载第三方库可以实现以下几种展示控件的刷新及加载：

1.ListView

2.ExpandableListView

3.GridView

4.WebView

PullToRefresh框架下载地址：https://download.csdn.net/download/qq_26464451/10315370（记得加依赖匹配版本）

这里有控件使用总结+https://blog.csdn.net/chenrushui/article/details/51394735 

控件： 

  <com.handmark.pulltorefresh.library.PullToRefreshListView
        android:id="@+id/prl"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

 代码：

    private int page = 1;

    Handler handler = new Handler();
    String path = "http://api.expoon.com/AppNews/getNewsList/type/1/p/";
    private List<JsonBean.DataBean> list;
    private ArrayList<JsonBean.DataBean> arrayList;

    @Override
    protected void initData() {
        //设置可刷新加载
        prl.setPullToRefreshEnabled(true);
        //设置模式
        prl.setMode(PullToRefreshListView.Mode.BOTH);
        //监听
        prl.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<ListView>() {
            @Override
            public void onPullDownToRefresh(PullToRefreshBase<ListView> refreshView) {
                page = 1;
                getJsonData(path + page);
                handler.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        prl.onRefreshComplete();
                    }
                }, 2000);
            }

            @Override
            public void onPullUpToRefresh(PullToRefreshBase<ListView> refreshView) {
                page++;
                getJsonData(path + page);
                handler.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        prl.onRefreshComplete();
                    }
                }, 2000);
            }
        });
        getJsonData(path + page);
    }

 private void getJsonData(String path) {
        MyAsyncTask myAsyncTask = new MyAsyncTask();
        myAsyncTask.execute(path);
    }

    private class MyAsyncTask extends AsyncTask<String, Void, String> {

        @Override
        protected String doInBackground(String... strings) {
            String uri = strings[0];
            try {
                URL url = new URL(uri);
                //打开链接
                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                //请求方式
                conn.setRequestMethod("GET");
                //判断状态码
                if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {
                    InputStream inputStream = conn.getInputStream();
                    //设字节输出流
                    ByteArrayOutputStream bos = new ByteArrayOutputStream();
                    byte[] buffer = new byte[1024];
                    int len = 0;
                    while ((len = inputStream.read(buffer)) != -1) {
                        bos.write(buffer, 0, len);
                    }
                    //关流
                    inputStream.close();
                    bos.close();
                    String json = bos.toString();
                    return json;
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onPostExecute(String json) {
            super.onPostExecute(json);
            Log.i("xxx", "onPostExecute: " + json);
            //解析
            Gson gson = new Gson();
            JsonBean jsonBean = gson.fromJson(json, JsonBean.class);
            list = jsonBean.getData();
            if (page == 1) {
                arrayList = new ArrayList<>();
            }
            arrayList.addAll(list);
            //展示
            MyAdapter myAdapter = new MyAdapter(arrayList, getActivity());
            prl.setAdapter(myAdapter);
            prl.setSelection(myAdapter.getCount() - 19);
        }
    }

适配器展示多条目展示+ https://blog.csdn.net/weixin_43917449/article/details/85798278