[lubonay]

How do you set those variables? Do you keep a reference to your activity or fragment inside another screen? Do you clean up that reference on configuration change, or let it leak and/or cause crashes?

Your best bet to pass data around is to... not pass it but rather use a sophisticated DI setup where you can set up shared objects that live in a certain scope. Of course, you can add parameters to a bundle with some boilerplate, but that's not a great idea if the serialization overhead hurts you.

[kllrnohj]

Neither the ViewModel library nor Activity#onRetainNonConfigurationInstance() is what I'd call a "sophisticated DI setup"