从网上加载图片其后展示在屏幕上

 1 package org.lxh.server;
 2 
 3 import java.io.ByteArrayOutputStream;
 4 import java.io.InputStream;
 5 import java.net.HttpURLConnection;
 6 import java.net.URL;
 7 
 8 import org.xml.demo.server.R;
 9 
10 import android.app.Activity;
11 import android.graphics.Bitmap;
12 import android.graphics.BitmapFactory;
13 import android.os.Bundle;
14 import android.os.StrictMode;
15 import android.widget.ImageView;
16 
17 /**
18  * 
19  * @author Administrator 从网上下载图片然后展示在屏幕上
20  * 
21  */
22 
23 public class MyWebDemo extends Activity {
24     private static final String PATH = "http://a.hiphotos.baidu.com/album/w%3D2048/sign=5c4fe8d4a5c27d1ea5263cc42fedac6e/024f78f0f736afc3f1416515b219ebc4b7451274.jpg";
25     private ImageView img = null;
26 
27     @Override
28     protected void onCreate(Bundle savedInstanceState) {
29         // TODO Auto-generated method stub
30         super.onCreate(savedInstanceState);
31         super.setContentView(R.layout.main_http);
32         this.img = (ImageView) super.findViewById(R.id.img);
33 
34         StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()
35                 .detectDiskReads().detectDiskWrites().detectNetwork()
36                 .penaltyLog().build());
37         StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder()
38                 .detectLeakedSqlLiteObjects().detectLeakedClosableObjects()
39                 .penaltyLog().penaltyDeath().build());
40         try {
41             byte data[] = this.getUrlData();
42             Bitmap bm = BitmapFactory.decodeByteArray(data, 0, data.length);
43             this.img.setImageBitmap(bm);
44         } catch (Exception e) {
45             e.printStackTrace();
46         }
47     }
48 
49     public byte[] getUrlData() throws Exception {
50         ByteArrayOutputStream bos = null;
51         try {
52             //定义URl
53             URL url = new URL(PATH);
54             //定义内存输入流
55             bos = new ByteArrayOutputStream();
56             //每次读取1024个
57             byte data[] = new byte[1024];
58             //打开
59             HttpURLConnection conn = (HttpURLConnection) url.openConnection();
60             //取得输入流
61             InputStream inputStream = conn.getInputStream();
62             int len = 0;
63             //读取到底部
64             while ((len = inputStream.read(data)) != -1) {
65                 bos.write(data, 0, len);
66             }
67             //变成字节数组返回
68             return bos.toByteArray();
69         } catch (Exception e) {
70             throw e;
71         } finally {
72             if (bos != null) {
73                 //关闭流
74                 bos.close();
75             }
76         }
77     }
78 }


<uses-permission android:name="android.permission.INTERNET" />