Android and iOS can interrupt app processes to optimize resource usage. The system can kill apps in the background to gain more memory and CPU for the foreground. A killed app will start from scratch when a user brings it back. However, the user expects to see the same app state as when they left it instead of starting over again. In this tutorial, you’ll see how to preserve the state of Flutter apps when the system decides to kill them.

Project link: https://www.kodeco.com/36759497-state-restoration-of-flutter-app