non-nullable variable is not initialized

Question

I am having this problem where it says the non nuablle variable must be initialized

  static MediaQueryData _mediaQueryData;
  static double screenWidth;
  static double screenHeight;
  static double deafualtSize;
  static Orientation orientation;

  void init(BuildContext context) {
    _mediaQueryData = MediaQuery.of(context);
    screenWidth = _mediaQueryData.size.width;
    screenHeight = _mediaQueryData.size.height;
    orientation = _mediaQueryData.orientation;
  }
}

The error you are facing is not in the code you shows. You have a non nullablle parameter somewhere (with attribute @required). — G3nt_M3caj
– G3nt_M3caj, Commented Aug 23, 2021 at 15:39
This is weird as I still have not used them anywhere and it already shows the error — Ahmed Al-Khateeb
– Ahmed Al-Khateeb, Commented Aug 23, 2021 at 15:48
Can you post your stacktrace. You can add that after your question.. — G3nt_M3caj
– G3nt_M3caj, Commented Aug 23, 2021 at 15:49
Can you post the class those are inside? THe code you have posted is to small to unddertand — G3nt_M3caj
– G3nt_M3caj, Commented Aug 23, 2021 at 15:54

Siddharth Agrawal · Accepted Answer · 2021-08-23 15:59:59Z

2

Ig you need to do something like this

 static MediaQueryData _mediaQueryData = 0;
  static double screenWidth = 0;
  static double screenHeight = 0;
  static double deafualtSize = 0;
  static Orientation? orientation;
  
  void init(BuildContext context) {
    _mediaQueryData = MediaQuery.of(context);
    screenWidth = _mediaQueryData.size.width;
    screenHeight = _mediaQueryData.size.height;
    orientation = _mediaQueryData.orientation;
  }
}

Everythime you use the orientation variable you will have to call it like orientation!
This error is because of the new null safety feature. You have to either give a default value or say that the variable can be null by using a ? after the type declaration as in the example above
Hope it helps. Let me know if there is any other problem

answered Aug 23, 2021 at 15:59

Siddharth Agrawal

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