--- title: "Thanh Le (@thanhle147) | Hashnode" description: "I'm a Flutter Developer. Read the latest articles by Thanh Le on Hashnode." url: "https://hashnode.com/@thanhle147" --- @thanhle147 # Thanh Le @thanhle147 · Hanoi, Vietnam · Joined September 2021 I'm a Flutter Developer ### [How to Create the Right Release Key Hash for Android settings in a Facebook App ID](https://thanhle.hashnode.dev/how-to-generate-right-key-hash-on-android-release-build-when-using-facebook-auth?utm_source=hashnode&utm_medium=feed) How to fix "Invalid key hash" on release build 2 min read · [thanhle.hashnode.dev](https://thanhle.hashnode.dev/how-to-generate-right-key-hash-on-android-release-build-when-using-facebook-auth?utm_source=hashnode&utm_medium=feed) [Sep 7, 2025](https://hashnode.com/posts/how-to-generate-right-key-hash-on-android-release-build-when-using-facebook-auth/68bdc959263545f2c02b896d) ### [Flutter: Scrolling to the first invalid form field](https://thanhle.hashnode.dev/flutter-scrolling-to-the-first-invalid-form-field?utm_source=hashnode&utm_medium=feed) Do you want functionality like scrolling to the first invalid field (after being validated)? So, one of my projects has verrry long form fields. (I know it's imperfect at UX, but that is the specifics of the application). And that came to the questio... 3 min read · [thanhle.hashnode.dev](https://thanhle.hashnode.dev/flutter-scrolling-to-the-first-invalid-form-field?utm_source=hashnode&utm_medium=feed) [Jul 23, 2022](https://hashnode.com/posts/flutter-scrolling-to-the-first-invalid-form-field/62dbf958cf7a8a6d54f077cf) ### [Animate SliverAppBar's widgets when scrolling](https://thanhle.hashnode.dev/animate-sliverappbars-widgets-when-scrolling?utm_source=hashnode&utm_medium=feed) Have you ever created something like this? 4 min read · [thanhle.hashnode.dev](https://thanhle.hashnode.dev/animate-sliverappbars-widgets-when-scrolling?utm_source=hashnode&utm_medium=feed) [1](https://hashnode.com/posts/animate-sliverappbars-widgets-when-scrolling/61599323e2f1936f70b27b7f) [Oct 3, 2021](https://hashnode.com/posts/animate-sliverappbars-widgets-when-scrolling/61599323e2f1936f70b27b7f)