SDL_Event event;
while (SDL_PollEvent(&event)) {
   ...
}

static int32_t engine_handle_input(struct android_app* app, AInputEvent* event) {
    struct engine* engine = (struct engine*)app->userData;
    if (AInputEvent_getType(event) == AINPUT_EVENT_TYPE_MOTION) {
          ...
    }
    return 0;
}