android加载网络图片之前获取图片信息

URL m_url = new URL(url);
HttpURLConnection con = (HttpURLConnection) m_url.openConnection();
InputStream in = con.getInputStream();
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeStream(in, null, options);
int height = options.outHeight;
int width = options.outWidth;
String s = "高度是" + height + "宽度是" + width;