Pad: Microsoft X-Box 360 pad via OTG

RightStick X - X Axis
RightStick Y - Y Axis (inverted)
RightStick Click - Button 8
LeftStick X - Axis 3
LeftStick Y - Axis 4
LeftStick Click - Button 9
D-Pad Left-Right - Axis 5
D-Pad Up-Down - Axis 6
Left Bumper - Button 4
Right Bumper - Button 5
Left Trigger - Axis 7 (positive)
Right Trigger - Axis 8 (positive)
FaceButton Top (Y) - Button 3
FaceButton Bottom (A) - Button 0
FaceButton Left (X) - Button 2
FaceButton Right(B) - Button 1
StartButton - Button 10
BackButton - Nexus 7 - Android Back (Escape in Unity) | Galaxy S3 - Button 11
Xbox Button - Nexus 7 - AndroidHome | Galaxy S3 - Button 12

Same as XBox except:

Left Trigger- button6
Right Trigger- button7

Note - Face buttons get moved around on the S3

MOGA HERO - in HID or "B" mode
Same as XBox, triggers non-functional.