Flutter, late keyword with declaration

by

Declare variables that will be initialised later by using the late keyword.

late data_type variable_name;

When a late variable is used before it has been initialised, this error happens. You must keep in mind that although you used some variables or data that were marked as “late,” their values were not altered or saved beforehand.

late String name;
@override
Widget build(BuildContext context) {
  return Scaffold(
    body: Text(name)
    //runtime error: 
    //LateInitializationError: Field 'name' has not been initialized.
  );
}

This signifies that the variable name has no value at this time; it will be initialised in the Future. We have used this variable in the Text() widget without first initialising it.

To fix this problem

late String name;

@override
void initState() {
  name = "Flutter Campus";
  super.initState();
}

@override
Widget build(BuildContext context) {
  return Scaffold(
    body: Text(name)
  );
}

More Related Contents:

  1. “The operator can’t be unconditionally invoked because the receiver can be null” error after migrating to Dart null-safety
  2. No data from sever API’s is not showing on Listview using flutter
  3. How to wait for forEach to complete with asynchronous callbacks?
  4. Null check operator used on a null value
  5. Flutter – ClipPath
  6. Flutter: Scrolling to a widget in ListView
  7. Flutter how to programmatically exit the app
  8. How to make flutter app responsive according to different screen size?
  9. How to take a screenshot of the current widget – Flutter
  10. How to create dropown list in flutter where data comes from API?
  11. Iterating through a list to render multiple widgets in Flutter?
  12. How can I add a border to a widget in Flutter?
  13. Do not use BuildContexts across async gaps
  14. Flutter: how to prevent device orientation changes and force portrait?
  15. The equivalent of wrap_content and match_parent in flutter?
  16. Could not find the correct provider above this widget
  17. Cannot run with sound null safety because dependencies don’t support null safety
  18. How do I disable a Button in Flutter?
  19. Smart cast (automatic type promotion) using ‘is’ is not working
  20. How to Determine Screen Height and Width
  21. How can I get the height of a widget?
  22. Listview filter search in Flutter
  23. Error: Unable to ‘pub upgrade’ flutter tool. Retrying in five seconds
  24. How to hide soft input keyboard on flutter after clicking outside TextField/anywhere on screen?
  25. How to hide soft input keyboard on flutter after clicking outside TextField/anywhere on screen?
  26. How to work with progress indicator in flutter?
  27. Flutter: BottomNavigationBar rebuilds Page on change of tab
  28. How to get the color of the image pixel on which I clicked?
  29. How can I add shadow to the widget in flutter?
  30. The getter ‘documents’ isn’t defined for the type ‘QuerySnapshot’

Leave a Comment