Registers a listener that fires whenever any of the user's locale settings change.
The listener is called with no arguments. Read current() or details() inside the
callback to inspect the new state.
The OS subscription starts lazily on the first listener and is released automatically
when the last listener is removed via removeWatcher.
Registers a listener that fires whenever any of the user's locale settings change. The listener is called with no arguments. Read
current()ordetails()inside the callback to inspect the new state. The OS subscription starts lazily on the first listener and is released automatically when the last listener is removed viaremoveWatcher.