PullToRefresh

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package fmh.bwie.com.fanmeihua20170916;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.ListView;import android.widget.TextView;import com.google.gson.Gson;import com.handmark.pulltorefresh.library.PullToRefreshBase;import com.handmark.pulltorefresh.library.PullToRefreshListView;import com.nostra13.universalimageloader.core.ImageLoader;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.util.ArrayList;import java.util.List;import fmh.bwie.com.fanmeihua20170916.bean.Shiliu;public class MainActivity extends AppCompatActivity {    private PullToRefreshListView plv;    String url = "https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10&page=1";    private List<Shiliu.NewslistBean> newslist;    ArrayList<Shiliu.NewslistBean> list =new ArrayList<>();    private MyAdapter myAdapter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        new MyAsycnJson().execute(url);        //获取id        plv = (PullToRefreshListView) findViewById(R.id.plv);        //设置可以上拉可以下拉        plv.setMode(PullToRefreshBase.Mode.BOTH);        plv.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<ListView>() {            @Override            public void onPullDownToRefresh(PullToRefreshBase<ListView> refreshView) {                list.clear();                new MyAsycnJson().execute(url);                myAdapter.notifyDataSetChanged();            }            @Override            public void onPullUpToRefresh(PullToRefreshBase<ListView> refreshView) {                new MyAsycnJson().execute(url);                myAdapter.notifyDataSetChanged();            }        });    }    private class MyAdapter extends BaseAdapter {        @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 vh;            if (view == null) {                view = View.inflate(MainActivity.this, R.layout.plv_item, null);                vh = new ViewHolder();                vh.img = (ImageView)view.findViewById(R.id.img);                vh.title =(TextView)view.findViewById(R.id.title);                view.setTag(vh);            } else {                vh = (ViewHolder)view.getTag();            }            ImageLoader.getInstance().displayImage(list.get(i).getPicUrl(),vh.img);            vh.title.setText(list.get(i).getTitle());            return view;        }        class ViewHolder {            ImageView img;            TextView title;        }    }    private class MyAsycnJson extends AsyncTask<String, Void, String> {        @Override        protected String doInBackground(String... strings) {            try {                URL url = new URL(strings[0]);                HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();                int responseCode = urlConnection.getResponseCode();                if (responseCode == 200) {                    InputStream inputStream = urlConnection.getInputStream();                    BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));                    StringBuffer stringBuffer = new StringBuffer();                    String str = "";                    while ((str = bufferedReader.readLine()) != null) {                        stringBuffer.append(str);                    }                    return stringBuffer.toString();                }            } catch (MalformedURLException e) {                e.printStackTrace();            } catch (IOException e) {                e.printStackTrace();            }            return null;        }        @Override        protected void onPreExecute() {            super.onPreExecute();        }        @Override        protected void onPostExecute(String s) {            super.onPostExecute(s);            Gson gson = new Gson();            Shiliu shiliu = gson.fromJson(s, Shiliu.class);            newslist = shiliu.getNewslist();            list.addAll(newslist);            //创建适配器            myAdapter = new MyAdapter();            plv.setAdapter(myAdapter);            myAdapter.notifyDataSetChanged();            plv.onRefreshComplete();        }        @Override        protected void onProgressUpdate(Void... values) {            super.onProgressUpdate(values);        }    }}
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