LiveData+ViewModel+Repository搭建MVVM
什么是LiveData
LiveData is an observable data holder class. Unlike a regular observable, LiveData is lifecycle-aware, meaning it respects the lifecycle of other app components, such as activities, fragments, or services. This awareness ensures LiveData only updates app component observers that are in an active lifecycle state.
Source:https://developer.android.com/topic/libraries/architecture/livedata.html
什么是ViewModel
The ViewModel class is designed to store and manage UI-related data in a lifecycle conscious way. The ViewModel class allows data to survive configuration changes such as screen rotations.
Source:https://developer.android.com/topic/libraries/architecture/viewmodel
ViewModel的生命周期
