should iuse WidgetsFlutterBinding.ensureInitialized(); two times?-CodePudding

I have used firebase and shared_preferences in the main function so I should use the instruction WidgetsFlutterBinding.ensureInitialized(); two times or one enough?

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  WidgetsFlutterBinding.ensureInitialized();
  SharedPreferences prefs = await SharedPreferences.getInstance();
 .....
  runApp( MyApp());
}

CodePudding user response：

One time initialization is enough.

If you look at ensureInitialized()'s source code,
all it does is to check whether the WidgetsBinding instance is null or not.
If it's null, a new instance is created.

Here's the function:

    static WidgetsBinding ensureInitialized() {
      if (WidgetsBinding.instance == null)
        WidgetsFlutterBinding();
      return WidgetsBinding.instance!;
    }