'Got a compilation problem with dart null safety

I am new to flutter null safety and I can't manage how to have no compilation error. This is the (incomplete) code

GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey<ScaffoldState>();
Scaffold(
  key: _scaffoldKey
);
...
showDialog(context: _scaffold.currentContext)

showdialog is waiting for a non null BuildContext so I got the error:

The argument type 'BuildContext?' can't be assigned to the parameter type 'BuildContext'

Help please!

flutter dart-null-safety

Solution 1:^[1]

If you sure that _scaffold.currentContext can never be null:

GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey<ScaffoldState>();
Scaffold(
  key: _scaffoldKey
);
...
showDialog(context: _scaffold.currentContext!) //Add "!" here and the problem is solved

Solution 2:^[2]

Try using

//@dart=2.9

in line 1 of main.dart file

Sources

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Source: Stack Overflow

Solution	Source
Solution 1	Electron
Solution 2	Lakshydeep Vikram Sah

'Got a compilation problem with dart null safety

Solution 1:[1]

Solution 2:[2]

Sources

Related Questions

Solution 1:^[1]

Solution 2:^[2]