Flutter is written in the Dart language. However, (IMO) Flutter only covered a small piece of the Android native SDK. Thus, I need to figure out the risk of the mixing approach in advance.
Android's details are growing everyday. I got a book of 4298 pages. Flutter will be helpful. However, I did not believe it will "take off". Before the swift took off IOS, Chris Latiner (its author) had already been removed.