possible hints:
- have you installed flutter plugin for android studio? (`File` -> `Settings` -> `Plugins`)
- have you tried command-line? try `flutter devices` and `flutter doctor`
- does android studio report any errors/omissions/missing components in android sdk settings? (`File` -> `Settings` -> `Appearance and Behavior` -> `System settings` -> `Android SDK` )
hope one of the above will help to nail the bug.
Cheers!