使用Bitmap从网上下载图片

一个简单的从网上下载一张图片的例子。直接上代码：

 package com.suns.picturetest;

import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.widget.ImageView;

public class PictrueTestActivity extends Activity { 
    /** Called when the activity is first created. */
	private ImageView view=null;
	private String imageurl="https://www.bling0.com/system/avatars/4855/small/p_large_mnrk_71320001d24e2d0e.jpg?1323678179";
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        view=(ImageView)findViewById(R.id.picture);
        view.setImageBitmap(returnBitMap(imageurl));
    }
    
    public Bitmap returnBitMap(String url)
    {
		URL myurl=null;
		Bitmap bitmap=null;
		try{
			myurl=new URL(url);
		}catch(Exception e)
		{
			e.printStackTrace();
		}
		try{
			HttpURLConnection conn=(HttpURLConnection)myurl.openConnection();
			conn.setDoInput(true);
			conn.connect();
			InputStream is =conn.getInputStream();
			bitmap = BitmapFactory.decodeStream(is);
			is.close();
		}catch(Exception e)
		{
			e.printStackTrace();
		}
    	return bitmap;
    }
} package com.