My Unity IDE doesn't allow me to run the project for Android. I successfully do it for iOS, but the android section is totally disabled.
What am I missing?
I use AndroidSDK with both Android Studio and Eclipse - they normally build native projects and run them on devices and emulators. So, there must not be a problem with Android SDK.
You should take a look at this thread. "Unity 5.3 only has a few platforms downloaded and installed by default. In the installer, you need to check the platforms you need." When you install unity, make sure you check these