Flutter Demo App with Null Safety

[Paul Snyder]

Out of curiosity I ran the Flutter demo app after 2.12. I am pretty sure it built without errors the first time I tried since the app worked fine on the emulator. However when I tried to build a day later I get -

lib/main.dart:36:19: Error: The parameter 'key' can't have a value of 'null' because of its type 'Key', but the implicit default value is 'null'. and a similar error with this.title. Making key nullable and this.title required solves the problem but 1) am I the only one getting this error, and 2) is there any risk of a Null value in the Demo or is the error message an error? Thanks

 -

Try adding either an explicit non-'null' default value or the 'required' modifier.

  MyHomePage({Key key, this.title}) : super(key: key);

[Brett Morgan]

Hey Paul.

If you look at where you call MyHomePage, I'm guessing you aren't specifying the key. It's optional in the StatelessWidget constructor for a reason =)

If you modify your code as follows you should be fine:

MyHomePage({Key? key, this.title}) : super(key: key);

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[Paul Snyder]

Thanks - adding required before this.title was also necessary to get rid of the NS error