When I run flutter doctor command on mac its showing below, while I already install Android Studio, and I can run ios build from Android Studio.
[!] Android
I had a similar issue which I solved by updating my flutter config as follows:
flutter config --android-sdk="$HOME/Android/Sdk"
flutter config --android-studio-dir="/usr/local/android-studio"
This was on Ubuntu 20.04.1
Assumptions:
If you install Android studio using snap then
flutter config --android-studio-dir="/snap/android-studio/current/android-studio"