I am new to android, but I have finished setting up a Firebase backend for an iOS application. Now I am starting to code the Android version which should access the same Fir
While in your Project Overview click the cog Wheel and select project settings, while in settings under the general tab scroll down to Your apps and click Add App. then add another environment you want.
If you are building an android version of the app you use the same firebase project however when you are in the console you click Overview -> 'Add Another App' -> Click 'Android'
Follow the android setup and you are all good.
You can and you should use Same Firebase Project. So that, the database will be share between iOS and Android app.