I am using android studio 3.1 for some development.
But Its does not showing android option under Tools menu. Whereas Android studio 3.0 doesn\'t h
In my case, Android Studio 3.5.2, the location of the NDK bundle was not set in Preferences. To set NDK location, File -> Project Settings -> SDK Location then look for second field Android NDK Location. Once I provided the folder location for NDK bundle, Android Studio synced gradle again and built the app and showed all Android options under Tools.
link to image -- https://imgur.com/2yZVi0y