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kotlinlang

Hi, I have an question about Activity and ViewModel。

I used
```ViewModelProviders.of(MyActivity::this).get(ViewModel::class.java)```
to create a view model by activity. And view model has same instance after a configuration changed (e.g. rotation screen). It's all right and work fine. But I wonder how does view model keep it self's instance even activity has new instance after a configuration changed ?

<https://cs.android.com/androidx/platform/frameworks/support/+/androidx-main:activity/activity/src/main/java/androidx/activity/ComponentActivity.java;l=380?q=componentactivity|https://cs.android.com/androidx/platform/frameworks/support/+/androidx-main:activity[…]idx/activity/ComponentActivity.java;l=380?q=componentactivity>