When should you use WidgetsBindingObserver ?

WidgetsBindingObserver is a class in Flutter that allows you to observe the lifecycle of the application and respond to changes in the application state. Here are some scenarios when you should use WidgetsBindingObserver:

1. Handling application lifecycle events: WidgetsBindingObserver allows you to listen to application lifecycle events such as when the application is paused, resumed, inactive, or detached. This can be useful for performing tasks like saving data, releasing resources, or updating the UI based on the application state.

2. Responding to system events: WidgetsBindingObserver can be used to listen to system events such as changes in the system brightness, orientation, or locale. This can be useful for updating the UI or performing tasks based on these changes.

3. Debugging and testing: WidgetsBindingObserver can be used for debugging and testing purposes. By observing the application lifecycle events, you can ensure that your application behaves correctly in different states and handle edge cases appropriately.

4. Implementing custom behavior: If you need to implement custom behavior based on the application lifecycle or system events, WidgetsBindingObserver provides a way to hook into these events and perform your own logic.

Here's an example of how you can use WidgetsBindingObserver to observe the application lif...