xlistview上拉刷新，下拉加载

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package com.qianqian.xlistview;import android.os.AsyncTask;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.TextView;import com.google.gson.Gson;import com.nostra13.universalimageloader.core.ImageLoader;import com.qianqian.xlistview.bean.Data;import com.qianqian.xlistview.view.xlist.XListView;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity {    //声明变量    XListView xlv;    List<Data.NewslistBean> list=new ArrayList<Data.NewslistBean>();;    int current=1;     MyAdapter adapter;    boolean flag=false;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        //找控件        xlv= (XListView) findViewById(R.id.xlv);        //初始化数据        initData();        //设置适配器        adapter = new MyAdapter();        //绑定        xlv.setAdapter(adapter);        //刷新        xlv.setPullRefreshEnable(true);        //加载        xlv.setPullLoadEnable(true);        //时间        xlv.setRefreshTime("2017-10-18");        //监听        xlv.setXListViewListener(new XListView.IXListViewListener() {            //刷新            @Override            public void onRefresh() {                flag=false;                current=1;                initData();                xlv.stopRefresh();            }            //加载            @Override            public void onLoadMore() {                flag=true;                current++;                initData();                xlv.stopLoadMore();            }        });    }//初始化数据    private void initData() {        new AsyncTask<String, String, String>() {            @Override            protected String doInBackground(String... parmas) {                //解析                getData();                return null;            }            @Override            protected void onPostExecute(String result) {                //刷新                adapter.notifyDataSetChanged();                super.onPostExecute(result);            }        }.execute();    }    //解析的方法    private void getData() {        //路径        String path="https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10&page="+current;        try {            URL url=new URL(path);            HttpURLConnection conn=(HttpURLConnection) url.openConnection();            conn.setConnectTimeout(5000);            conn.setReadTimeout(5000);            int code = conn.getResponseCode();            if (code==200) {                //gson解析                Gson gson=new Gson();                Data data = gson.fromJson(new InputStreamReader(conn.getInputStream()), Data.class);//list=data.getNewslist();                if (flag) {                    list.addAll(data.getNewslist());                } else {                    list=data.getNewslist();                }               // list.addAll(data.getNewslist());            }        } catch (Exception e) {            e.printStackTrace();        }    }//适配器的方法    class  MyAdapter extends BaseAdapter{        @Override        public int getCount() {            if (list!=null){                return  list.size();            }            return 0;        }        @Override        public Object getItem(int i) {            return null;        }        @Override        public long getItemId(int i) {            return 0;        }        //优化        @Override        public View getView(int i, View view, ViewGroup viewGroup) {            ViewHolder holder;            if (view==null) {                //加载布局                view=View.inflate(MainActivity.this, R.layout.item, null);                holder=new ViewHolder();                //扎控件                holder.tv_title =(TextView) view.findViewById(R.id.tv_title);                holder.tv_desc =(TextView) view.findViewById(R.id.tv_desc);                holder.tv_time =(TextView) view.findViewById(R.id.tv_time);                holder.iv =(ImageView) view.findViewById(R.id.iv);                view.setTag(holder);            }else {                holder=(ViewHolder) view.getTag();            }            //赋值            holder.tv_title.setText(list.get(i).getTitle());            holder.tv_desc.setText(list.get(i).getDescription());            holder.tv_time.setText(list.get(i).getCtime());            ImageLoader.getInstance().displayImage(list.get(i).getPicUrl(), holder.iv);            return view;        }    }static  class  ViewHolder{TextView tv_title,tv_desc,tv_time;    ImageView iv;}}

//图片package com.qianqian.xlistview.bean;import android.app.Application;import com.nostra13.universalimageloader.core.DisplayImageOptions;import com.nostra13.universalimageloader.core.ImageLoader;import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;import com.nostra13.universalimageloader.core.display.FadeInBitmapDisplayer;import com.qianqian.xlistview.R;public class Myapction extends Application{    @Override    public void onCreate() {        //初始化一个默认图片的配置        DisplayImageOptions options=new DisplayImageOptions.Builder()                .showImageOnLoading(R.mipmap.ic_launcher)                //渐显                .displayer(new FadeInBitmapDisplayer(3000)).cacheOnDisk(true)                .cacheInMemory(true)                .build();        ImageLoaderConfiguration config=new ImageLoaderConfiguration.Builder(this)                .threadPoolSize(4)                .defaultDisplayImageOptions(options)                .build();        //初始化        ImageLoader.getInstance().init(config);        super.onCreate();    }}

//xml
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:padding="10dp" >    <LinearLayout        android:layout_width="match_parent"        android:layout_height="80dp"        android:layout_marginLeft="10dp"        android:layout_toRightOf="@+id/iv"        android:orientation="vertical" >        <TextView            android:id="@+id/tv_title"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:singleLine="true"            android:text="标题" />        <TextView            android:id="@+id/tv_desc"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:lines="2"            android:text="描述" />        <TextView            android:id="@+id/tv_time"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_gravity="right"            android:singleLine="true"            android:text="时间" />    </LinearLayout>    <ImageView        android:id="@+id/iv"        android:layout_width="80dp"        android:layout_height="80dp"        android:layout_alignParentLeft="true" /></RelativeLayout>

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