利用PullToRefresh实现上拉下拉

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package com.example.week3;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.widget.ListView;import com.jwenfeng.library.pulltorefresh.BaseRefreshListener;import com.jwenfeng.library.pulltorefresh.PullToRefreshLayout;public class MainActivity extends AppCompatActivity {    private PullToRefreshLayout pull;    private ListView mlv;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        pull = (PullToRefreshLayout) findViewById(R.id.pull);        mlv = (ListView) findViewById(R.id.mlv);        GetData data=  new GetData();        data .data(MainActivity.this,mlv);        pull.setRefreshListener(new BaseRefreshListener() {            @Override            public void refresh() {            }            @Override            public void loadMore() {            }        });    }}-----------------------------适配器package com.example.week3;import android.content.Context;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.TextView;import com.nostra13.universalimageloader.core.ImageLoader;import java.util.List;public class MyAdapter extends BaseAdapter {    private List<JavaBean.NewslistBean> list;    private Context context;    private ViewHolder holder=null;    public MyAdapter(List<JavaBean.NewslistBean> list, Context context) {        this.list = list;        this.context = context;    }    @Override    public int getCount() {        return list.size();    }    @Override    public Object getItem(int i) {        return null;    }    @Override    public long getItemId(int i) {        return 0;    }    @Override    public View getView(int i, View view, ViewGroup viewGroup) {        if (view==null){            view=View.inflate(context,R.layout.listview_item,null);            holder = new ViewHolder();            holder.titl = view.findViewById(R.id.titl);            holder.tim = view.findViewById(R.id.tim);            holder.img= view.findViewById(R.id.img);            view.setTag(holder);        }else{            holder=(ViewHolder)view.getTag();        }        holder.titl.setText(list.get(i).getTitle());        holder.tim.setText(list.get(i).getCtime());        ImageLoader.getInstance().displayImage(list.get(i).getPicUrl(), holder.img);        return view;    }    class ViewHolder{        TextView titl;        TextView tim;        ImageView img;    }}
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package com.example.week3;import android.content.Context;import android.os.AsyncTask;import android.util.Log;import android.widget.ListView;import com.google.gson.Gson;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.URL;import java.util.List;public class GetData {     public GetData data(final Context context, final ListView listView){         new AsyncTask<String, Integer, String>() {             @Override             protected String doInBackground(String... strings) {                 String str="";                 try {                     URL url = new URL("https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10");                     //打开链接                     HttpURLConnection conne=(HttpURLConnection) url.openConnection();                     //设置时间                     conne.setRequestMethod("GET");                     conne.setReadTimeout(5000);                     conne.setConnectTimeout(5000);                     //获取响应码且判断其返回值是否是200                     int responseCode = conne.getResponseCode();                     Log.d("zzz","==================================================================================="+responseCode);                     if (responseCode==200) {                         InputStream in = conne.getInputStream();                         byte[] by= new byte[1024];                         int len=0;                         while ((len=in.read(by))!=-1) {                             str+=new String(by,0,len);                         }                         Log.d("zzz", "doInBackground霍长生: "+str);                     }                 } catch (Exception e) {                     // TODO Auto-generated catch block                     e.printStackTrace();                 }                 return str;             }             @Override             protected void onPostExecute(String result) {                 Gson gson = new Gson();                 JavaBean bean = gson.fromJson(result, JavaBean.class);                 List<JavaBean.NewslistBean> list = bean.getNewslist();//返回集合                 MyAdapter myadpader = new MyAdapter(list,context);                 listView.setAdapter(myadpader);             }         }.execute();         return null;     }}
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package com.example.week3;import android.app.Application;import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;import com.nostra13.universalimageloader.core.ImageLoader;/** * Created by 霍长生 on 2017/9/17 0017. */public class App extends Application {    @Override    public void onCreate() {        super.onCreate();        ImageLoaderConfiguration configuration=ImageLoaderConfiguration.createDefault(this);        ImageLoader.getInstance().init(configuration);    }}
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