list_saynctask

//工具类      NetWordUtils

package com.wzq.listviewimagetemp;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Log;


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;


/**
 * author:Created by WangZhiQiang on 2017-09-27.
 */


public class NetWordUtils {


    private static String  tag = "NetWordUtils";
    /**
     * 获取网络json
     *
     * @param urlString
     * @return
     */
    public static String getNetjson(String urlString) {


        try {
            URL url = new URL(urlString);
            HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
            urlConnection.setRequestMethod("GET");//若果是get请求可以不用配置; 其他请求必须配置
            urlConnection.setConnectTimeout(8000);//设置链接超时间


            InputStream inputStream = urlConnection.getInputStream();//获取网络返回的输入流;


            //可拼接的字符串
            StringBuilder stringBuilder = new StringBuilder();
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
            String temp = "";
            while ((temp = bufferedReader.readLine()) != null) {
                stringBuilder.append(temp);
                temp = "";
            }
            //这个是网络获取的数据
            String data = stringBuilder.toString();
            Log.e(tag, "getData: " + data);
            return data;
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return "";
    }




    /**
     * 获取网络图片的工具类
     *
     * @param urlString
     * @return
     */
    public static Bitmap getNetBitmap(String urlString) {


        try {
            //用URL封装链接地址;
            URL url = new URL(urlString);
            //用url打开链接
            HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
            //联网的状态码
            int responseCode = urlConnection.getResponseCode();
            if(responseCode ==200){
                //链接上获取输入流
                InputStream inputStream = urlConnection.getInputStream();
                //把流直接转换成bitmap(系统提供的BitmapFactory)
                Bitmap bitmap = BitmapFactory.decodeStream(inputStream);//BitmapFactory是个工具类,系统提供的
                return bitmap;
            }else {
                Log.e(tag, "网络状态码:: "+responseCode );
            }








        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;


    }

}

//MainActivity   

package com.example.list_saynctask;import android.graphics.Bitmap;import android.os.AsyncTask;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;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 java.util.List;import static com.example.list_saynctask.R.id.lv;import static com.example.list_saynctask.R.id.textView2;public class MainActivity extends AppCompatActivity {    private ListView listView;    String Total="http://api.expoon.com/AppNews/getNewsList/type/1/p/1";    private List<Bean.DataBean> list;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        listView = (ListView) findViewById(lv);        intData();    }    private void intData() {        new MAsyncTask().execute(Total);    }    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) {            View view1 =View.inflate(MainActivity.this,R.layout.list_iteam,null);            TextView tv_name = (TextView) view1.findViewById(textView2);            ImageView iv = (ImageView) view1.findViewById(R.id.iv);            tv_name.setText(list.get(i).getNews_title());            new MImageAsyncTask(iv).execute(list.get(i).getPic_url());            return view1;        }    }    class MAsyncTask extends AsyncTask<String,Void,String>{        private MyAdapter myAdapter;        @Override        protected String doInBackground(String... strings) {            String url=strings[0];            String s = NetWordUtils.getNetjson(url);            return s;        }        @Override        protected void onPostExecute(String s) {            super.onPostExecute(s);            Gson gson = new Gson();            Bean bean = gson.fromJson(s, Bean.class);            list = bean.getData();            myAdapter = new MyAdapter();            listView.setAdapter(myAdapter);        }    }    class MImageAsyncTask extends AsyncTask<String,Void,Bitmap>{        private ImageView iv;        public MImageAsyncTask(ImageView iv) {            this.iv = iv;        }        @Override        protected Bitmap doInBackground(String... strings) {            String string = strings[0];            return NetWordUtils.getNetBitmap(string);        }        @Override        protected void onPostExecute(Bitmap bitmap) {            super.onPostExecute(bitmap);            iv.setImageBitmap(bitmap);        }    }}