I did not find an adequate answer on the Internet and decided to turn to you with a request to help me. When creating variables, I don't want all these variables to be required, but if I don't add the word required, then I get an error in the constructor. How can I add my variables to the constructor without the word required? It's really in my opinion not convenient to add all the variables with the required parameter and causes me a lot of problems. For example, here is my code, in which I do not want to add a parameter for various reasons, and I often see such examples
class AudioFile extends StatefulWidget {
final AudioPlayer advancedPlayer;
const AudioFile({Key? key, required this.advancedPlayer}) : super(key: key);
@override
State<AudioFile> createState() => _AudioFileState();
}
class _AudioFileState extends State<AudioFile> {
@override
Widget build(BuildContext context) {
return Container();
}
}
CodePudding user response:
if you want a variable be nullable use ?
like this:
class AudioFile extends StatefulWidget {
final AudioPlayer? advancedPlayer;
const AudioFile({Key? key, this.advancedPlayer}) : super(key: key);
@override
State<AudioFile> createState() => _AudioFileState();
}
CodePudding user response:
You can make data nullable
class AudioFile extends StatefulWidget {
final AudioPlayer? advancedPlayer;
const AudioFile({Key? key, this.advancedPlayer}) : super(key: key);
@override
State<AudioFile> createState() => _AudioFileState();
}
class _AudioFileState extends State<AudioFile> {
@override
Widget build(BuildContext context) {
return Container();
}
}
CodePudding user response:
if you want a variable be nullable you can use ?