PullToRefreshListView

布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:ptr="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
    <!--
        ptr:ptrDrawable="@drawable/default_ptr_flip":刷新时显示的图片
        ptr:ptrAnimationStyle="flip"：刷新的图片以何种方式显示出来
        ptr:ptrHeaderBackground="#383838"：刷新时头部的布局
        ptr:ptrHeaderTextColor="#FFFFFF"：刷新时头部字体的颜色
        还需要添加以下的命名空间
       xmlns:ptr="http://schemas.android.com/apk/res-auto"
    -->
    <com.handmark.pulltorefresh.library.PullToRefreshListView
        android:id="@+id/ptf"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        ptr:ptrAnimationStyle="flip"
        ptr:ptrDrawable="@drawable/default_ptr_flip"
        ptr:ptrHeaderBackground="#383838"
        ptr:ptrHeaderTextColor="#FFFFFF"></com.handmark.pulltorefresh.library.PullToRefreshListView>
</LinearLayout>

package com.bwie.android.demo1.fragment;

import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;

import com.bwie.android.demo1.ListAdapter;
import com.bwie.android.demo1.R;
import com.bwie.android.demo1.bean.NewsBean;
import com.bwie.android.demo1.utils.MyAsyncTask;
import com.google.gson.Gson;
import com.handmark.pulltorefresh.library.ILoadingLayout;
import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshListView;

import java.util.ArrayList;
import java.util.List;

public class MainFragmnet extends Fragment {
    private int num = 10;
    private View view;
    //    设置标记
    public static int TYPE_UP = 1;
    private ListAdapter listAdapter;
    private List<NewsBean.NewslistBean> list = new ArrayList<>();
    private PullToRefreshListView plv;

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        view = inflater.inflate(R.layout.main_frag, container, false);

        //initView();
        // initData();
        plv = view.findViewById(R.id.ptf);
        initPlv();
        requestNetData();
        return view;
    }

    private void requestNetData() {
        String urlPath = "http://api.tianapi.com/world/?key=8322c06e5b327bbd19a026a643835f7e&num=" + num;
        MyAsyncTask task = new MyAsyncTask(new MyAsyncTask.IcallBack() {


            @Override
            public void getDada(String jsonStr) {
                Gson gson = new Gson();
                NewsBean newsBean = gson.fromJson(jsonStr, NewsBean.class);
                List<NewsBean.NewslistBean> newslist = newsBean.getNewslist();

//                调用设置适配器的方法
                if (TYPE_UP == 2) {
                    list.clear();//清除所有数据
                }
//                添加到集合
                list.addAll(newslist);
                setPlvAdapter();
//                关闭头尾布局
                plv.onRefreshComplete();
            }
        });
        task.execute(urlPath);
    }

    public void setPlvAdapter() {
        if (listAdapter == null) {
            listAdapter = new ListAdapter(list, getActivity());
            plv.setAdapter(listAdapter);
        } else {
            listAdapter.notifyDataSetChanged();
        }
    }

    /**
     * 初始化PullToRefreshListView
     */
    private void initPlv() {
//    设置模式    BOTH 支持上拉加载  下拉刷新
        plv.setMode(PullToRefreshBase.Mode.BOTH);
//        设置头尾布局的文字

/*这里通过getLoadingLayoutProxy 方法来指定上拉和下拉时显示的状态的区别，
第一个true 代表下来状态 ，第二个true 代表上拉的状态
如果想区分上拉和下拉状态的不同，可以分别设置*/
        ILoadingLayout startLabels = plv.getLoadingLayoutProxy(true, false);
        startLabels.setPullLabel("下拉刷新");
        startLabels.setRefreshingLabel("正在拉");
        startLabels.setReleaseLabel("放开刷新");
        ILoadingLayout endLabels = plv.getLoadingLayoutProxy(false, true);
        endLabels.setPullLabel("上拉刷新");
        endLabels.setRefreshingLabel("正在载入...");
        endLabels.setReleaseLabel("放开刷新...");
//        设置监听
        plv.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<ListView>() {
            //            刷新
            @Override
            public void onPullDownToRefresh(PullToRefreshBase<ListView> pullToRefreshBase) {
                TYPE_UP = 2;
                num = 10;
                requestNetData();

            }

            //加载
            @Override
            public void onPullUpToRefresh(PullToRefreshBase<ListView> pullToRefreshBase) {
                TYPE_UP = 1;
                num += 5;
                requestNetData();
            }
        });
    }


}

```## 请求数据
private void requestNetData() {
        String urlPath = "http://api.tianapi.com/world/?key=8322c06e5b327bbd19a026a643835f7e&num=" + num;
        MyAsyncTask task = new MyAsyncTask(new MyAsyncTask.IcallBack() {


            @Override
            public void getDada(String jsonStr) {
                Gson gson = new Gson();
                NewsBean newsBean = gson.fromJson(jsonStr, NewsBean.class);
                List<NewsBean.NewslistBean> newslist = newsBean.getNewslist();

                if (TYPE_UP == 2) {
                    list.clear();//清除所有数据
                }
//                添加到集合
                list.addAll(newslist);
                //设置适配器
                setPlvAdapter();
//                关闭头尾布局
                plv.onRefreshComplete();
            }
        });
        task.execute(urlPath);
    }
    //设置适配器
    public void setPlvAdapter() {
        if (listAdapter == null) {
            listAdapter = new ListAdapter(list, getActivity());
            plv.setAdapter(listAdapter);
        } else {
            listAdapter.notifyDataSetChanged();
        }
    }