$ flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, v1.7.8+hotfix.3, on Linux, locale en_US.UTF-8)

[!] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
    ! Some Android licenses not accepted.  To resolve this, run: flutter doctor --android-licenses
[✓] Android Studio (version 3.2)
[✓] VS Code (version 1.33.1)
[✓] Connected device (1 available)

! Doctor found issues in 1 category.