Can't find ViewModelProviders class, only ViewModelProvider

Question

I am trying to create lifecycle-aware view models. But I can't find ViewModelProviders class in my Android project, only ViewModelProvider. There seems to be no android.arch.lifecycle.ViewModelProviders package for me to import as well. What's happening

Answer 1

You probably have this dependency included in your project:

implementation "android.arch.lifecycle:viewmodel:$lifecycle_version"

That contains ViewModelProvider (and just 4 other classes), but ViewModelProviders is in a different package:

implementation "android.arch.lifecycle:extensions:$lifecycle_version"

Here are the contents of these packages for reference (as of version 1.1.1):

---

For the record, you can find this out yourself by looking up the docs for the ViewModelProviders class, where it says up top:

added in version 1.1.0

belongs to Maven artifact android.arch.lifecycle:extensions:1.1.1