android:自定义imageview，可显示网络图片 

 1 package com.example.test.widget;
 2 
 3 import java.io.ByteArrayOutputStream;
 4 import java.io.IOException;
 5 import java.io.InputStream;
 6 import java.net.HttpURLConnection;
 7 import java.net.MalformedURLException;
 8 import java.net.URL;
 9 import java.net.URLConnection;
10 
11 import android.content.Context;
12 import android.graphics.Bitmap;
13 import android.graphics.BitmapFactory;
14 import android.os.Handler;
15 import android.os.Message;
16 import android.util.AttributeSet;
17 import android.widget.ImageView;
18 
19 /**
20  * 自定义imageview，可显示网络图片
21  * 
22  * @author huaf22@gmail.com
23  * @date 2013-10-5 下午8:21:24
24  */
25 public class NetImageView extends ImageView {
26     public NetImageView(Context context) {
27         super(context);
28         // TODO Auto-generated constructor stub
29     }
30 
31     public NetImageView(Context context, AttributeSet attrs) {
32         super(context, attrs);
33     }
34 
35     Handler handler = new Handler() {
36 
37         @Override
38         public void handleMessage(Message msg) {
39             // TODO Auto-generated method stub
40             byte[] data = (byte[]) msg.obj;
41             if (data != null) {
42                 Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0,
43                         data.length);
44                 setImageBitmap(bitmap);// 显示图片
45             }
46         }
47 
48     };
49 
50     public void setNetImage(final String path) {
51         new Thread(new Runnable() {
52             public void run() {
53                 handler.sendMessage(handler.obtainMessage(21, httpServer(path)));
54             }
55         }).start();
56     }
57 
58     private byte[] httpServer(String imagepath) {
59         HttpURLConnection conn = null;
60         InputStream is = null;
61         ByteArrayOutputStream os = new ByteArrayOutputStream();
62         try {
63             conn = (HttpURLConnection) new URL(imagepath).openConnection();
64             conn.setConnectTimeout(5000);
65             conn.setRequestMethod("GET");
66             if (conn.getResponseCode() == 200) {
67                 is = ((URLConnection) conn).getInputStream();
68                 byte[] buffer = new byte[1024];
69                 int len = 0;
70                 while ((len = is.read(buffer)) != -1) {
71                     os.write(buffer, 0, len);
72                 }
73                 return os.toByteArray();
74             }
75         } catch (MalformedURLException e) {
76             // TODO Auto-generated catch block
77             e.printStackTrace();
78         } catch (IOException e) {
79             // TODO Auto-generated catch block
80             e.printStackTrace();
81         } finally {
82             try {
83                 is.close();
84 85             } catch (IOException e) {
86                 // TODO Auto-generated catch block
87                 e.printStackTrace();
88             }
89         }
90         return null;
91     }
92 }

使用方法：

1     <com.example.test.widget.NetImageView
2         android:id="@+id/imageView1"
3         android:layout_width="wrap_content"
4         android:layout_height="wrap_content"
5         android:layout_alignLeft="@+id/button1"
6         android:layout_below="@+id/button1"
7         android:layout_marginTop="80dp"
8         android:src="@drawable/ic_launcher" />

 

1 private NetImageView imageview = null;
2 
3 private String imagepath="http://192.168.1.102:8080/APP/usrIcon/002.jpg";
4 
5 imageview = (NetImageView) findViewById(R.id.imageView1);
6 
7 imageview.setNetImage(imagePath);

缺点：

1.不能加载多个大图片，会产生内存溢出

2.没有线程数量控制，加载N多图片时，会产生N多线程

我会在以后的版本里继续改进。。。

posted @ 2013-10-06 11:45  skyko  阅读(972)  评论(0)  编辑  收藏  举报