xlistview

第四步

MyAsyncTask 

package com.bawei.test.xlistview;import android.content.Context;import android.content.Intent;import android.os.AsyncTask;import android.util.Log;import android.view.View;import android.widget.AdapterView;import android.widget.ListView;import com.google.gson.Gson;import java.io.BufferedReader;import java.io.InputStream;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.URL;import java.util.List;public class MyAsyncTask   extends AsyncTask<String,Integer,String> {    static DataBean mDatabean;    Context con;    String url;    String type;    ListView listView;    public MyAsyncTask(Context con, String url, String type, ListView listView) {        super();        this.url=url;        this.con=con;        this.type=type;        this.listView=listView;    }    //网络请求    public void GetDatas(String murl, String mtype) {        //头条服务器地址        try {            URL url = new URL(murl);            //打开连接            HttpURLConnection connection = (HttpURLConnection) url.openConnection();            //设置            connection.setRequestMethod(mtype);            connection.setConnectTimeout(5000);            connection.setReadTimeout(5000);            //post方式要提交参数给服务器...以流的方式提交给服务器            connection.setDoOutput(true);            //设置请求参数的类型            //connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");            String params = "key=8d6e3228d25298f13af4fc40ce6c9679&num=10";            //参数以流的形式写给服务器...字节数组的形式写出去            connection.getOutputStream().write(params.getBytes());            //响应            int responseCode = connection.getResponseCode();            if (responseCode == 200) {                //获取输入字节流                InputStream inputStream = connection.getInputStream();                String json = streamToString(inputStream, "utf-8");                Log.i("json", json);                //解析...解析完成之后发送到主线程,设置适配器                Gson gson = new Gson();                mDatabean = gson.fromJson(json, DataBean.class);                Log.i("json", mDatabean.getCode());            }        } catch (Exception e) {            e.printStackTrace();        }    }    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;    }    @Override    protected void onPostExecute(String s) {        super.onPostExecute(s);        List<DataBean.NewslistBean> listbean=mDatabean.getNewslist();        //设置适配器        MyAdapter myAdapter = new MyAdapter(listbean,con);        listView.setAdapter(myAdapter);    }    public MyAsyncTask() {        super();    }    @Override    protected String doInBackground(String... strings) {        GetDatas(url, type);        return null;    }}