PullToRefresh引入依赖,布局，适配器ListView上拉加载下拉刷新

使用PullToRefreshListView前 先在File-New-import Module 导入pulltoRefreshLibrary，然后给项目 添加 module的依赖，
选择pulltoRefreshLibraryactivity_main.xml 
<?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"        ></com.handmark.pulltorefresh.library.PullToRefreshListView></RelativeLayout>

适配器里面的
public class MyAdapter extends BaseAdapter{    List<DBean.NewslistBean> list;    Context context;    public MyAdapter(List<DBean.NewslistBean> list, Context context) {        this.context = context;        this.list = list;        ImageLoaderConfiguration configuration = ImageLoaderConfiguration.createDefault(context);        ImageLoader.getInstance().init(configuration);    }    @Override    public int getCount() {        return list.size();    }    @Override    public Object getItem(int i) {        return list.get(i);    }    @Override    public long getItemId(int i) {        return i;    }    @Override    public View getView(int i, View view, ViewGroup viewGroup) {        ViewHolder holder;        if (view==null){            view = View.inflate(context,R.layout.list_item,null);            holder = new ViewHolder();            holder.imageView = view.findViewById(R.id.list_image);            holder.textView = view.findViewById(R.id.list_text);            view.setTag(holder);        }else{            holder = (ViewHolder) view.getTag();        }        holder.textView.setText(list.get(i).getTitle());        ImageLoader.getInstance().displayImage(list.get(i).getPicUrl(),holder.imageView);        return view;    }    class ViewHolder{        ImageView imageView;        TextView textView;    }}

MainActivity里面的
import android.os.AsyncTask;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;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.io.UnsupportedEncodingException;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Date;import java.util.List;import java.util.stream.Stream;public class MainActivity extends AppCompatActivity {    private List<DBean.NewslistBean> list = new ArrayList<>();    private PullToRefreshListView refreshListView;int num = 1;    private MyAdapter myAdapter;    private ILoadingLayout endlabels;    private ILoadingLayout startlabels;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        refreshListView = (PullToRefreshListView) findViewById(R.id.refresh_list_view);        getDataFromNet();        //设置PullToRefreshListView刷新模式,上拉下拉都可以        refreshListView.setMode(PullToRefreshBase.Mode.BOTH);        //设置刷新显示的状态,可以下拉,不能上拉        startlabels = refreshListView.getLoadingLayoutProxy(true,false);        startlabels.setRefreshingLabel("正在刷新");        startlabels.setPullLabel("下拉刷新");        startlabels.setReleaseLabel("松开刷新");        endlabels = refreshListView.getLoadingLayoutProxy(false,true);        endlabels.setRefreshingLabel("正在加载");        endlabels.setPullLabel("上拉加载");        endlabels.setReleaseLabel("松开加载");        //设置监听事件        refreshListView.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<ListView>() {            @Override            //下拉刷新调用            public void onPullDownToRefresh(PullToRefreshBase<ListView> refreshView) {                num =1;                //获取数据                getDataFromNetxiala();                setAdapter();            }            @Override            //上拉加载调用            public void onPullUpToRefresh(PullToRefreshBase<ListView> refreshView) {                num++;                getDataFromNet();                setAdapter();            }        });    }    private void setAdapter() {        if (myAdapter==null) {         myAdapter = new MyAdapter(list, MainActivity.this);            refreshListView.setAdapter(myAdapter);        }else{         myAdapter.notifyDataSetChanged();        }    }    private void getDataFromNet() {        AsyncTask<Void, Void, String> asyncTask = new AsyncTask<Void, Void, String>() {            @Override            protected String doInBackground(Void... voids) {                String path = "https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10&page="+num;                try {                    URL url = new URL(path);                    HttpURLConnection connection = (HttpURLConnection) url.openConnection();                    connection.setRequestMethod("GET");                    connection.setConnectTimeout(5000);                    connection.setReadTimeout(5000);                    int responseCode = connection.getResponseCode();                    if (responseCode==200){                        InputStream inputStream = connection.getInputStream();                        String json = streamtoString(inputStream,"utf-8");                        Thread.sleep(2000);                        return json;                    }                } catch (Exception e) {                    e.printStackTrace();                }                return null;            }            @Override            protected void onPostExecute(String json) {                Gson gson = new Gson();                DBean dBean = gson.fromJson(json, DBean.class);                list.addAll(dBean.getNewslist());                long currentTimeMillis = System.currentTimeMillis();                Date date2= new Date(currentTimeMillis);                SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm");                String format = dateFormat.format(date2);                //设置刷新的时间                endlabels.setLastUpdatedLabel(format);                //停止刷新                refreshListView.onRefreshComplete();                setAdapter();            }        };        asyncTask.execute();    }    private void getDataFromNetxiala() {        AsyncTask<Void, Void, String> asyncTask = new AsyncTask<Void, Void, String>() {            @Override            protected String doInBackground(Void... voids) {                String path = "https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10&page="+num;                try {                    URL url = new URL(path);                    HttpURLConnection connection = (HttpURLConnection) url.openConnection();                    connection.setRequestMethod("GET");                    connection.setConnectTimeout(5000);                    connection.setReadTimeout(5000);                    int responseCode = connection.getResponseCode();                    if (responseCode==200){                        InputStream inputStream = connection.getInputStream();                        String json = streamtoString(inputStream,"utf-8");                        Thread.sleep(2000);                        return json;                    }                } catch (Exception e) {                    e.printStackTrace();                }                return null;            }            @Override            protected void onPostExecute(String json) {                Gson gson = new Gson();                DBean dBean = gson.fromJson(json, DBean.class);                list.addAll(0,dBean.getNewslist());                long currentTimeMillis = System.currentTimeMillis();                Date date2= new Date(currentTimeMillis);                SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm");                String format = dateFormat.format(date2);                //设置刷新的时间                startlabels.setLastUpdatedLabel(format);                //停止刷新                refreshListView.onRefreshComplete();                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);            }            return builder.toString();        } catch (Exception e) {            e.printStackTrace();        }        return charset;    }}