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我正在使用 Facebook SDK。我想获取当前登录的用户头像。我的代码:

img_url = new URL("https:/graph.facebook.com/" + user.getId() + "/picture?type=large");
                            InputStream is = img_url.openConnection().getInputStream();
                            Bitmap avatar;
                            avatar = BitmapFactory.decodeStream(is);

发现以下异常:

java.net.UnknownHostException: https:/graph.facebook.com/100001119045663/picture?type=large

如何解决这个异常?

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