Time for action – handling accelerometer events

Let's handle accelerometer events in DroidBlaster:

1. Open jni/InputHandler.hpp and add a new method onAccelerometerEvent(). Include the android/sensor.h official header for sensors:

   #ifndef _PACKT_INPUTHANDLER_HPP_
   #define _PACKT_INPUTHANDLER_HPP_
   
   #include <android/input.h>
   #include <android/sensor.h>
   
   class InputHandler {
   public:
       virtual ~InputHandler() {};
   
       virtual bool onTouchEvent(AInputEvent* pEvent) = 0;
       virtual bool onKeyboardEvent(AInputEvent* pEvent) = 0;
       virtual bool onTrackballEvent(AInputEvent* pEvent) = 0;
       virtual bool onAccelerometerEvent(ASensorEvent* pEvent) = 0;
   };
   #endif

2. Create new methods in jni/EventLoop.hpp:

   • activateAccelerometer() and deactivateAccelerometer() to enable/disable the accelerometer sensor when the activity starts and stops.

   • processSensorEvent() retrieves and dispatches sensor events.

   • The callback callback_input() static method is bound to the Looper.

   Also, define the following members...