void android_main(struct android_app* pAndroidApp)
{
     ...
     pAndroidApp->onAppCmd = engine_handle_cmd;
     pAndroidApp->onInputEvent = engine_handle_input;
     ...
}

// Process touch events
static int32_t engine_handle_input(struct android_app* app, AInputEvent* event)
{
     // touch event
     if (AInputEvent_getType(event) == AINPUT_EVENT_TYPE_MOTION)
     {
          // get x and y coordinates from screen
          int x = AMotionEvent_getX(event, 0);
          int y = AMotionEvent_getY(event, 0);

          // is touch pressed
          if ( (AMOTION_EVENT_ACTION_MASK & AMotionEvent_getAction(pEvent)) == AMOTION_EVENT_ACTION_DOWN)
          {
               ...
          }

          // is touch unpressed
          else if ( (AMOTION_EVENT_ACTION_MASK & AMotionEvent_getAction(pEvent)) == AMOTION_EVENT_ACTION_UP)
          {
               ...
          }

          return 1; // return 1 means that we handled event
     }
     return 0;
}

// Process window events
static void engine_handle_cmd(struct android_app* app, int32_t cmd)
{
     switch (cmd) {

          // The window is being shown, get it ready.
          case APP_CMD_INIT_WINDOW:
               ...
               break;

          // The window is being hidden or closed
          case APP_CMD_TERM_WINDOW:
               ...
               break;

          // When our app get focus
          case APP_CMD_GAINED_FOCUS:
               ...
               break;

          // When our app lost focus
          case APP_CMD_LOST_FOCUS:
               ...
               break;

          default:
               break;
     }
}