I have the Galaxy S7 Active and had the Note 7(RIP). I used a ps3 controller with past phones through usb otg and it worked fine, but not with the S7 active or the Note 7 when I had it. I read that Samsung removed support for the official dualshock controllers on the 7 series flagships for some reason, (possibly to try to make you buy their seemingly extinct bluetooth controller) so do not get a dualshock for your Galaxy S7. I tried the dualshock 3 and 4 with no luck. Other generic usb controllers seem to work, I have a generic ps3 controller with a usb dongle and it works fine through otg. Bluetooth would be another option.
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