What about for Android? Green tea requires cooler water than black is that something a person new to tea will be shown or is all data the user enters via trial

What about for Android? Green tea requires cooler water than black is that something a person new to tea will be shown or is all data the user enters via trial and error? If it's pre-determined what about mixing different teas which is a common thing to do if the brew settings per tea type are set can other users submit new mixes 10% green, 90% black and say use X grams and brew for Y minutes? FYI I just posted to Reddit/r/Tea too.