AsyncTask

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package com.example.bwie.weekone;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
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.example.bwie.weekone.Bean.beans;
import com.google.gson.Gson;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class MainActivity extends AppCompatActivity {
    ListView lv;
    MyAdapter adapter;
    beans be;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
         lv= (ListView) findViewById(R.id.lv);
        getData();
        adapter=new MyAdapter();
        lv.setAdapter(adapter);
    }
    class MyAdapter extends BaseAdapter{

        @Override
        public int getCount() {
            if(be!=null){
                return be.getData().size();
            }
            return 0;
        }

        @Override
        public Object getItem(int i) {
            return null;
        }

        @Override
        public long getItemId(int i) {
            return 0;
        }

        @Override
        public View getView(final int i, View view, ViewGroup viewGroup) {
           final ViewHolder holder;
            if(view==null){
                view=View.inflate(MainActivity.this,R.layout.list_item,null);
                holder=new ViewHolder();
                holder.im1=(ImageView)view.findViewById(R.id.im1);
                holder.tx1=(TextView) view.findViewById(R.id.tx1);
                holder.tx2=(TextView) view.findViewById(R.id.tx2);
                view.setTag(holder);
            }else{
                holder=(ViewHolder) view.getTag();
            }
            holder.tx1.setText(be.getData().get(i).getNews_title());
            holder.tx2.setText(be.getData().get(i).getNews_summary());
            new Thread(new Runnable() {
                @Override
                public void run() {
                    final Bitmap img=getImg(be.getData().get(i).getPic_url());
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            holder.im1.setImageBitmap(img);
                        }
                    });
                }
            }).start();
            return view;
        }
    }
class ViewHolder{
    TextView tx1,tx2;
    ImageView im1;
}
    protected Bitmap getImg(String path){
        Bitmap bit=null;
        try {
            URL url=new URL(path);
            HttpURLConnection conn= (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET");
            conn.setConnectTimeout(5000);
            conn.setReadTimeout(5000);
            int code=conn.getResponseCode();
            if(code==200){
                InputStream is=conn.getInputStream();
                bit= BitmapFactory.decodeStream(is);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return bit;
    }
    private void getData() {
        new AsyncTask<String,Integer,String>(){

            @Override
            protected String doInBackground(String... strings) {
                String result=geteConn();
                return result;
            }

            @Override
            protected void onPostExecute(String result) {
                Gson gson=new Gson();
                be=gson.fromJson(result,beans.class);
                adapter.notifyDataSetChanged();
                super.onPostExecute(result);
            }
        }.execute();
    }
    //获取网络数据
    public String geteConn() {
        String result="";

        try {
            String path="http://api.expoon.com/AppNews/getNewsList/type/1/p/1";
            URL url=new URL(path);
            HttpURLConnection conn= (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET");
            conn.setConnectTimeout(5000);
            conn.setReadTimeout(5000);
            int code=conn.getResponseCode();
            if(code==200){
                InputStream is=conn.getInputStream();
                ByteArrayOutputStream bos=new ByteArrayOutputStream();
                int lent=-1;
                byte[] buff=new byte[1024];
                while((lent=is.read(buff))!=-1){
                    bos.write(buff,0,lent);
                }
                    result=new String(bos.toByteArray());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }
}

AsyncTask

标签：example   content   tle   tput   override   rom   tag   summary   save   

原文地址：http://www.cnblogs.com/yun1128/p/7471020.html