android异步加载网络图片

package yc.get_image; import java.io.BufferedInputStream; import java.io.IOException; import java.io.InputStream; import java.net.URL; import java.net.URLConnection; import android.app.Activity; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.os.Bundle; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.GridView; import android.widget.ImageView; /** * 得到网络图片 * * @author 叶超 * */ /* * 读取网络图片，注意添加网络权限 <uses-permission android:name="android.permission.INTERNET" * /> */ public class GetTheNetImage extends Activity { // private String IMG_URL = // "http://www.fzlqqtx.cn/uploads/allimg/101025/1_101025191847_1.jpg"; private String images[] = { "http://www.qqt6.com/uploads/allimg/100820/1_100820065756_1.jpg", "http://www.qq74.net/upimg/allimg/110113/0135115L5-11.jpg", "http://www.kanfzl.com/article/UploadPic/2010-10/20101013932918.jpg", "http://www.feizl.com/upload2007/2011_05/1105241418527525.jpg", "http://www.oaiqq.com/uploads/allimg/101008/21441229e-15.jpg", "http://www.tombit.cn/news/UploadPic/2010-12/2010122814432671.jpg" }; GridView netGridView; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); netGridView = (GridView)findViewById(R.id.gridview); netGridView.setAdapter(new ImagesAdapter(this)); // netImage = (ImageView) findViewById(R.id.netImage); // load(); } public class ImagesAdapter extends BaseAdapter{ private Context mContext; public ImagesAdapter(Context context) { mContext = context; } public int getCount() { return images.length; } public Object getItem(int arg0) { return null; } public long getItemId(int arg0) { return 0; } public View getView(int position, View convertView, ViewGroup parent) { ImageView imageView; // System.out.println(convertView); // if -- else 为了节省内存空间，减少对象的创建 if (convertView == null) { imageView = new ImageView(mContext); //设置显示图片的大小 imageView.setLayoutParams(new GridView.LayoutParams(200, 200)); imageView.setScaleType(ImageView.ScaleType.CENTER_CROP); imageView.setPadding(0, 0, 0, 0); } else { imageView = (ImageView) convertView; } try { URL aURL = new URL(images[position]); URLConnection con = aURL.openConnection(); con.connect(); InputStream is = con.getInputStream(); /* 建立缓冲区是一个良好的编程习惯. */ BufferedInputStream bis = new BufferedInputStream(is); /* 解析网络上的图片 */ Bitmap bm = BitmapFactory.decodeStream(bis); imageView.setImageBitmap(bm); bis.close(); is.close(); /* 这时图片已经被加载到ImageView中. */ } catch (IOException e) { e.printStackTrace(); } return imageView; } } }