工具代码

 public class AsyncUploadImage extends AsyncTask<Object, Object, Object> {
	private static final String TAG = "AsyncUploadImage ";
	ImageView iv;
	private HttpURLConnection connection;
	private InputStream is;
	private Bitmap bitmap;
	public AsyncUploadImage(ImageView mImageView) {
		iv = mImageView;
	}
	@Override
	protected Object doInBackground(Object... params) {
		URL url;
		try {
			url = new URL((String) params[0]);
			connection = (HttpURLConnection) url.openConnection();
			connection.setDoInput(true);
			connection.connect();
			is = connection.getInputStream();
			bitmap = BitmapFactory.decodeStream(is);
			is.close();
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				if (is != null) {
					is.close();
				}
				if (connection != null) {
					connection.disconnect();
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return bitmap;
	}
	@Override
	protected void onPostExecute(Object result) {
		super.onPostExecute(result);
		if (null != result) {
			iv.setImageBitmap((Bitmap) result);
			Log.i(TAG, "image download ok！！！");
		}else {
			iv.setBackgroundResource(R.drawable.shuben1);
			Log.i(TAG, "image download false！！！");
		}
	}

}

具体使用的代码

 new AsyncUploadImage(itemIcon).execute("http://temp/file/book/images/1325310017.jpg");

//http://temp/file/book/images/1325310017.jpg  -> (this is your image url..)