[ERROR/EXCEPTION] java.lang.IllegalArgumentExceptionNo destination with ID 2131361846 is on the NavController's back stack. The current destination is null

[이슈] navigation 시 app crash

[원인] Lifecycle 이슈(NavGraphViewModel은 navigation graph에서 backstackEntry를 가져오는데 Activity에서 아직 Navigation.setGraph()가 불리기 전에 viewModel이 초기화되어 생기는 문제)

 

[재현 조건]
Activity 백그라운드에서 제거됨
Activity onCreate에서 Navigation.setGraph() 호출
NavGraphViewModel 사용

 

[해결]

1. Activity.onCreate() 에서 Navigation.setGraph() -> activity_main.xml로 이동
2. viewModel 접근을 onViewCreated()에서 하면 됨

참고>https://battleship-park.medium.com/navgraphviewmodels-%EC%97%90%EC%84%9C-the-current-destination-is-null-%EC%98%88%EC%99%B8-%EB%B0%9C%EC%83%9D%ED%95%98%EB%8A%94-%ED%98%84%EC%83%81-12764da6bcda