PullToRefreshListView 刷新

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这是 xml文件

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"   >    <com.handmark.pulltorefresh.library.PullToRefreshListView        xmlns:ptr="http://schemas.android.com/apk/res-auto"        android:layout_height="match_parent"        android:layout_width="match_parent"        android:id="@+id/refresh_list_view"        ptr:ptrDrawable="@drawable/default_ptr_flip"        ptr:ptrAnimationStyle="flip"        ptr:ptrHeaderBackground="#383838"        ptr:ptrHeaderTextColor="#FFFFFF"/></RelativeLayout>

Mainactivity 主界面

package com.example.liuhuan20171019;import android.os.AsyncTask;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.widget.ListView;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.io.BufferedReader;import java.io.InputStream;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.URL;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity {   private List<DataDataBean.NewslistBean>list=new ArrayList<>();    private PullToRefreshListView refresh_list_view;    private ILoadingLayout startLabels;    private ILoadingLayout endLabels;    private int page = 1;    private MyAdapter myAdapter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        refresh_list_view = (PullToRefreshListView) findViewById(R.id.refresh_list_view);        getData();        refresh_list_view.setMode(PullToRefreshBase.Mode.BOTH);        startLabels = refresh_list_view.getLoadingLayoutProxy(true, false);        startLabels.setPullLabel("下拉刷新");        startLabels.setRefreshingLabel("正在刷新...");        startLabels.setReleaseLabel("放开刷新");        endLabels = refresh_list_view.getLoadingLayoutProxy(false, true);        endLabels.setPullLabel("上拉刷新");        endLabels.setRefreshingLabel("正在载入...");        endLabels.setReleaseLabel("放开刷新...");      refresh_list_view.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<ListView>() {          @Override          public void onPullDownToRefresh(PullToRefreshBase<ListView> refreshView) {              getRefreshData();          }          @Override          public void onPullUpToRefresh(PullToRefreshBase<ListView> refreshView) {             page++;                 getData();              refresh_list_view.onRefreshComplete();          }      });    }    private void getRefreshData() {        AsyncTask<Void, Void, String> asyncTask = new AsyncTask<Void, Void, String>() {            @Override            protected String doInBackground(Void... voids) {                try {                    URL url = new URL("https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10&page=1");                    HttpURLConnection connection = (HttpURLConnection) url.openConnection();                    connection.setRequestMethod("GET");                    connection.setReadTimeout(5000);                    connection.setConnectTimeout(5000);                    int responseCode = connection.getResponseCode();                    if (responseCode == 200){                        InputStream inputStream = connection.getInputStream();                        String json = streamToString(inputStream , "utf-8");                        return json ;                    }                } catch (Exception e) {                    e.printStackTrace();                }                return "";            }            @Override            protected void onPostExecute(String s) {                Gson gson=new Gson();                DataDataBean dataDataBean = gson.fromJson(s, DataDataBean.class);              list.addAll(dataDataBean.getNewslist());                setAdapter();                refresh_list_view.onRefreshComplete();            }        };        asyncTask.execute();    }    private void setAdapter() {        if (myAdapter == null) {            myAdapter = new MyAdapter(MainActivity.this, list);            refresh_list_view.setAdapter(myAdapter);        }else{            myAdapter.notifyDataSetChanged();        }    }    private void getData() {        AsyncTask<Void, Void, String> asyncTask = new AsyncTask<Void, Void, String>() {            @Override            protected String doInBackground(Void... voids) {                try {                    URL url = new URL("https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10&page="+page);                    HttpURLConnection connection = (HttpURLConnection) url.openConnection();                    connection.setRequestMethod("GET");                    connection.setReadTimeout(5000);                    connection.setConnectTimeout(5000);                    int responseCode = connection.getResponseCode();                    if (responseCode == 200){                        InputStream inputStream = connection.getInputStream();                        String json = streamToString(inputStream , "utf-8");                        return json ;                    }                } catch (Exception e) {                    e.printStackTrace();                }                return "";            }            @Override            protected void onPostExecute(String s) {                Gson gson = new Gson();                DataDataBean dataDataBean = gson.fromJson(s, DataDataBean.class);                list.addAll(dataDataBean.getNewslist());                setAdapter();            }        };        asyncTask.execute();    }    private String streamToString(InputStream inputStream, String charset) {        try {            InputStreamReader inputStreamReader = new InputStreamReader(inputStream,charset);            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);            String s = null;            StringBuilder builder = new StringBuilder();            while ((s = bufferedReader.readLine()) != null){                builder.append(s);            }            bufferedReader.close();            return builder.toString();        } catch (Exception e) {            e.printStackTrace();        }        return  null;    }}

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