WebApr 29, 2024 · You could also use a typedef to name the function: typedef Int2VoidFunc = void Function(int); // or: typedef void Int2VoidFunc(int arg); class MyOtherClass { final Int2VoidFunc callback; MyOtherClass(this.callback); void callCallaback() { callback(5); } } WebApr 11, 2024 · But, the problem is that when I open PianoMain so, it plays any one of key's audio. Then if I press any key's onTap it doesn't work. So, let me put my code here. And, please check if you can find any mistake of mine. AudioPlayer player = AudioPlayer (); void playAudio ( {required String fileName}) { player.play (AssetSource (fileName)); }
Why are certain variables marked as final in flutter custom classes ...
WebAug 7, 2024 · 6. I am confused as to when its compulsory to use final for variables. According to documents and answers on StackOverflow, If you make a StatefulWidget subclass with non-final fields, it will result in DartAnalysis warning. But I made this class and everything runs fine. class Order extends StatefulWidget { int hello = 1; @override … WebSep 27, 2024 · 1. you can create another logout () function and give context of home to push back to sign in screen/home screen , works for me as : logout () async { await googleSignIn.signOut (); Navigator.push (context, MaterialPageRoute (builder: (context) … crystal ball flower
flutter - How to return Future or any other types from a function …
WebMay 17, 2024 · Flutter default value for a Function. I am currently learning a course on Flutter. They provide you with an old stub project (nullable). When I try to migrate to Flutter 2.12.0 or higher - null safety kicks in. I have a basic understanding on how it works - but this I cannot find anywhere on Google or StackOverFlow. I have a custom Card widget. WebJul 1, 2024 · When passing this Function, make sure to pass it like this: NewTransaction (addTx: () => addTx ());. If you pass it like this: NewTransaction (addTx: addTx ()); the function gets called instantly. When you say Function addTx it means any function can be passed. If Function () addTx it means function with no parameter. WebAug 28, 2024 · but if you add the function is invoked and the return value passed instead and with => you can make it a function reference again or in this case a closure. Share Improve this answer crystal ball for halloween