Is there an app on Google Play to fly my DJI drone if I have an Android phone?
It all depends on what DJI drone is in question.
DJI Go Android version: Inspire 1 & 2, Phantom 3, 4, Mavic Pro, Mavic Pro 2 & Zoom (and I’m sure a slew of other older drones).
DJI Fly Android - Mini, Mini 2, Mini 3 Pro, Air 2, Air 2S, Mavic 3 & Cine, FPV, and Avata
That’s pretty much most of the popular DJI drones represented here.