lifecycleStateChange method

@override void lifecycleStateChange(AppLifecycleState state)

This is the lifecycle state change hook; every time the game is resumed, paused or suspended, this is called.

The default implementation does nothing; override to use the hook. Check AppLifecycleState for details about the events received.

Implementation

@override
void lifecycleStateChange(AppLifecycleState state) {
  switch (state) {
    case AppLifecycleState.resumed:
      // On resume, if active overlay is not PauseMenu,
      // resume the engine (lets the parallax effect play).
      if (!(overlays.isActive(PauseMenu.id)) &&
          !(overlays.isActive(GameOverMenu.id))) {
        resumeEngine();
      }
      break;
    case AppLifecycleState.paused:
    case AppLifecycleState.detached:
    case AppLifecycleState.inactive:
    case AppLifecycleState.hidden:
      // If game is active, then remove Hud and add PauseMenu
      // before pausing the game.
      if (overlays.isActive(Hud.id)) {
        overlays.remove(Hud.id);
        overlays.add(PauseMenu.id);
      }
      pauseEngine();
      break;
  }
  super.lifecycleStateChange(state);
}