投影片：https://docs.google.com/presentation/d/1aRIGsrf-oiSx62dkdXvIx7fHftbqSaooM1G4SOAOdV0/edit?usp=sharing

錄影：https://youtu.be/DgXwdiuG1oQ

• Separation of concerns
• MVVM
• ViewModel
• LiveData，observer pattern，接水管
• lifecycle with view model
• onConfigurationChanged
• Memory leak?
• onSaveInstanceState / onRestoreInstanceState
• Transformation
• Custom LiveData

Resources:

https://medium.com/androiddevelopers/viewmodels-and-livedata-patterns-antipatterns-21efaef74a54

https://medium.com/androiddevelopers/livedata-beyond-the-viewmodel-reactive-patterns-using-transformations-and-mediatorlivedata-fda520ba00b7