I am using Dio for Json parsing and i have created a class for simple Json parsing and serializing but i am getting the following error
Non-nullable instance field '_dio' must be initialized. (Documentation) Try adding an initializer expression, or add a field initializer in this constructor, or mark it 'late'.
Below is the code for my class
Dio _dio;
final baseUrl = "";
HttpService(){
_dio = Dio(BaseOptions(
baseUrl:
));
}
What might i be doing wrong
CodePudding user response:
Your variable _dio
is non-nullable which means it can never be null.
However when you put Dio _dio;
it doesn't get a value.
You have 2 options:
Either make it nullable by putting a ?
after the type: Dio? _dio;
or make it a late
variable late Dio _dio;
which means that it will shortly after get a value (hopefully _dio = Dio(BaseOptions(baseUrl:));
will do so) so that it can be treated as "never null" afterwards.
EDIT: More on that topic: https://dart.dev/null-safety