To summarize, Flutter provides no automated or easy means to save/restore state when Android auto-kills the app (e.g. because of low memory). The main problem here is that the `onSaveInstanceState` and `onRestoreInstanceState` lifecycle callbacks require a synchronous response (return value) but the IPC system between Dart and native code is inherently asynchronous.

React Native currently has the very same problem. This is the reason why some very useful native components that require synchronous delegate callbacks (such as UITableView and UICollectionView from iOS) are not available from RN. However, the core team at Facebook is working on a "large re-architecture" that will allow synchronous calls into JS, fixing these issues:

https://facebook.github.io/react-native/blog/2018/06/14/stat...