Android - bit of a toy OS, really.
I have recently encountered the following issue with Andoids "OK Google" feature.
As per the Chocolate Factorys suggestion, I have my digital pal enabled in all screens ready to assist.
I set my Sat Nav up and start driving.
Someone in the car (maybe the radio) says "Google", and up pops the search screen ... obscuring the Sat Nav.
Guess what ?
There is no way to close that screen without touching the phone and riskng the 6 points/£2000 fine.
Hardly a business-proposition feature ?
Googling (oh the irony) suggests that this isn't a big deal for the Android Fanbois.