I get this warning in Android Studio in stateless widget
This class (or a class which this class inherits from) is marked as'@imutable' but one or more of its instance fields are not final
when I want to create variable outside of build method. How do I get rid of this warning... or am I doing something wrong?
Replicable code
class TestScreen extends StatelessWidget { final List<Map<String, dynamic>> list = [ {'id': 1, 'name': 'name1'}, {'id': 2, 'name': 'name2'} ]; List<int> _ids = []; @override Widget build(BuildContext context) { _ids.clear(); return Scaffold( body: Column( children: <Widget>[ Expanded( child: ListView.builder( itemCount: list.length, itemBuilder: (BuildContext context, int index) { _ids.add(list[index]['id']); return ListTile( title: Text(list[index]['name']), ); }), ), FlatButton( child: Text('Print all ids'), onPressed: () { print(_ids.toString()); }, ) ], ), ); }}peace of that warning message
