[FTC]: Set init values before running an opmode

[winonaramhawks]

Our FTC team is using Android Studio to create our OpModes to run on the FTC Robot Controller app. We are currently in the process of making a simple OpMode that makes the robot turn 90 degrees. The program will simply have the robot turn for a variable number of seconds. Is there a way to have the driver change this variable on the phone itself without having to hard-code the value of the variable in Java? Any help would be greatly appreciated! Thanks