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\section{Prototype}  \subsection{Early Prototype}  The program begins by setting up early prototype for the application made use of  the various Android SurfaceView, a View (classes for dealing with user  interface kits. It first waits and interaction)  for drawing graphics onto  the main interface kit (with screen), screen.   The prototype took in image files that were placed in  the circular touch phidget, resources folder,  and decoded them into Bitmap objects that could drawn onto  the RFID reader to be connected. It SurfaceView using the Canvas, which holds the drawing calls.   The Canvas was  then adds listeners used  to draw  the circular touch map background,  and RFID phidgets an arrow was drawn on top of that background.  A Thread was used  to detect events as and when they happen. Once the start-up procedure is complete, keep  the program state moves into graphics being drawn without it taking away processing from  the main loop of running code. This main loop performs all user interface, so  the major operations on the main interface kit. These operations include: application would not become unresponsive.  \begin{itemize}  \item Detecting thresholds and actioning commands for the slider  \item Detecting thresholds and actioning commands for the joystick  \item Detecting thresholds and actioning commands for the RFID reporgramming button  \end{itemize}  The main loop also ensures that whilst any of the phidgets are in use, they get exclusive access to the software, removing any inter-device conflicts. It also processes what happens in the event that the circular touch phidget is being used, as well as perfoming actions on any RFID tags detected by the system.  \subsection{System Walkthrough}