I did change it appropriately when three motor handle
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This project is a partial modification of open source at https://github.com/jfedor2/nxt-remote-control
I wanted a more comfortable operation with the 3 motor control, so I modified the 2 motor control layout slightly.
The first thing I did, was get open source and modify it to run in the Android studio environment.
Three motor control is difficult to turn the robot. So I created a view suitable for my robot.
The source code has been modified to allow three motor controls for the two motor control layout.