Question 128120 in Android Studio Question posted in
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Android Studio – The operand can't be null, so the condition is always false. I am receiving this warning

I have made a BMI calculator in flutter. I am new in flutter. After running the code i am receiving the above warning. Kindly provide me the solution of this problem. Below attached is the link of the code

Link of the dart file

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3

Answers


  1. 0

    You are declaring the _result variable as non-nullable,

     late double _result;

    However you do a null check

    null == _result ? "Enter Value" : _result.toStringAsFixed(2),

    So change your variable declaration to this,

    double? _result;

    And then you can null check this way

     _result?.toStringAsFixed(2) ?? "Enter Value" ,
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  2. 0

    You declared the result variable like this:

    late double _result;

    _result is the name of the variable, double is the type.

    late means you are not yet assigning a value to it.

    A late variable is different from a nullable variable in the sense that a nullable variable’s value could be null, a late variable doesn’t have a value until you assign one.

    late int xd;

if (xd == null) {
}

    the above if will always be false because xd‘s value is not null, xd has no value at all.

    a nullable variable is determined with a ? after the type:

    double? _result;

    which means that if you haven’t assigned anything to it, it will be null, but you can also assign null directly.

    _result = null;

    the above is not possible for a late variable.

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  3. 0

    Try changing the extractedData to jsonDecode(response.body)

    from

    if (extractedData == null)

    to

    if (jsonDecode(response.body) == null)
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