android:自定义imageview，可显示网络图片

package com.example.test.widget;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.widget.ImageView;

/**
 * 自定义imageview，可显示网络图片
 * 
 * @author huaf22@gmail.com
 * @date 2013-10-5 下午8:21:24
 */
public class NetImageView extends ImageView {
    public NetImageView(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
    }

    public NetImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    Handler handler = new Handler() {

        @Override
        public void handleMessage(Message msg) {
            // TODO Auto-generated method stub
            byte[] data = (byte[]) msg.obj;
            if (data != null) {
                Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0,
                        data.length);
                setImageBitmap(bitmap);// 显示图片
            }
        }

    };

    public void setNetImage(final String path) {
        new Thread(new Runnable() {
            public void run() {
                handler.sendMessage(handler.obtainMessage(21, httpServer(path)));
            }
        }).start();
    }

    private byte[] httpServer(String imagepath) {
        HttpURLConnection conn = null;
        InputStream is = null;
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        try {
            conn = (HttpURLConnection) new URL(imagepath).openConnection();
            conn.setConnectTimeout(5000);
            conn.setRequestMethod("GET");
            if (conn.getResponseCode() == 200) {
                is = ((URLConnection) conn).getInputStream();
                byte[] buffer = new byte[1024];
                int len = 0;
                while ((len = is.read(buffer)) != -1) {
                    os.write(buffer, 0, len);
                }
                return os.toByteArray();
            }
        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            try {
                is.close();
85             } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        return null;
    }
}

使用方法：

    <com.example.test.widget.NetImageView
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/button1"
        android:layout_below="@+id/button1"
        android:layout_marginTop="80dp"
        android:src="@drawable/ic_launcher" />

private NetImageView imageview = null;

private String imagepath="http://192.168.1.102:8080/APP/usrIcon/002.jpg";

imageview = (NetImageView) findViewById(R.id.imageView1);

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。。。