Android NDK Beginner's Guide - Second Edition

Time for action – handling keyboard, D-Pad, and trackball events natively

Let's extend our new Input system with more event types:

1. Open jni/InputHandler.hpp and add the keyboard and trackball event handlers:

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

2. Update the method processInputEvent() inside the existing file jni/EventLoop.cpp to redirect the keyboard and trackball events to InputHandler.

   Trackballs and touch events are assimilated to motion events and can be discriminated ...