What's the best way to save any changes to global state, that would be lost if the process was killed due to low memory etc?
For activities we have
onSaveInstanceState() which allows state to be saved when needed.
I would like something similar for global state. Our
Application class holds a references to many objects that can be simply reloaded in
onCreate() when the app next starts. But we also change the state of some of those objects, and require these changes to be maintained through the app being killed due to low memory etc.
We could of course persist every time changes are made to the objects in memory. But this would be very wasteful.
My current thought is to use
onActivitySaveInstanceState() and keep a dirty flag to know only to call it once. But this adds complexity and probably isn't what this method was intended for.
This cannot be a particularly uncommon requirement, but most of the resources on the net focus on just
Activity lifecycle. I'd be pleased to learn of a better approach.