Flutter, a framework developed by Google, aims to help developers build iOS and Android apps from a single codebase in Dart programming language. It is still an early-stage open-source project. The development environment only works on macOS and Linux (64-bit). I was curious about how Flutter performs comparing to Xamarin and Cordova, and thus, I got started with Flutter a week ago. When developing an Android app, you may need to use some third-party SDKs, which wrapped as *.jar, *.so or *.aar files. In this post, I will share how to link an Android aar file in Flutter project.