Improve app delegate
Improve app delegate

flooie/Presentation,luzefeng/Presentation,tonypham/Presentation,luzefeng/Presentation,tonypham/Presentation,ernestopino/Presentation,xuanyi0627/Presentation,flooie/Presentation,xuanyi0627/Presentation,ernestopino/Presentation,haaakon/Presentation,haaakon/Presentation