Null check operator used on a null value – Flutter

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Null check operator used on a null value – Flutter

How to solve Null check operator used on a null value – Flutter

The error means that you have used the null check operator (the exclamation mark) on something that instead happened to be null at runtime. So, looking at your code, it’s not only the list that might be null, but also the other objects you marked with !.
The problem is somewhere here, unless I missed some ! in your code:
itemCount: list!.files?.length, itemBuilder: (context, index) { final title = list!.files![index].originalFilename; return ListTile( leading: Text(title!), trailing: ElevatedButton( child: Text('Download'), onPressed: () { downloadGoogleDriveFile( filename: list!.files![index].originalFilename, id: list!.files![index].id); }, ), ); },
To avoid encountering that error using !, you can explicitly check whether an object is null, something like:
if (list == null) { [...some error handling or a message with a warning] } else { [your original code where you can use ! without fear of errors] }
or you can assign a value to an object only in the case it is null, like this:
title??= ['Default title for when some loading failed or something'];

Null check operator used on a null value – Flutter

The error means that you have used the null check operator (the exclamation mark) on something that instead happened to be null at runtime. So, looking at your code, it’s not only the list that might be null, but also the other objects you marked with !.
The problem is somewhere here, unless I missed some ! in your code:
itemCount: list!.files?.length, itemBuilder: (context, index) { final title = list!.files![index].originalFilename; return ListTile( leading: Text(title!), trailing: ElevatedButton( child: Text('Download'), onPressed: () { downloadGoogleDriveFile( filename: list!.files![index].originalFilename, id: list!.files![index].id); }, ), ); },
To avoid encountering that error using !, you can explicitly check whether an object is null, something like:
if (list == null) { [...some error handling or a message with a warning] } else { [your original code where you can use ! without fear of errors] }
or you can assign a value to an object only in the case it is null, like this:
title??= ['Default title for when some loading failed or something'];

Solution 1

The error means that you have used the null check operator (the exclamation mark) on something that instead happened to be null at runtime. So, looking at your code, it’s not only the list that might be null, but also the other objects you marked with !.

The problem is somewhere here, unless I missed some ! in your code:

itemCount: list!.files?.length,
itemBuilder: (context, index) {
    final title = list!.files![index].originalFilename;
    return ListTile(
      leading: Text(title!),
      trailing: ElevatedButton(
        child: Text('Download'),
        onPressed: () {
          downloadGoogleDriveFile(
              filename: list!.files![index].originalFilename,
              id: list!.files![index].id);
        },
      ),
    );
},

To avoid encountering that error using !, you can explicitly check whether an object is null, something like:

if (list == null) {
   [...some error handling or a message with a warning]
} else {
   [your original code where you can use ! without fear of errors]
}

or you can assign a value to an object only in the case it is null, like this:

title??= ['Default title for when some loading failed or something'];

Original Author il_boga Of This Content

Conclusion

So This is all About This Tutorial. Hope This Tutorial Helped You. Thank You.

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I am an Information Technology Engineer. I have Completed my MCA And I have 4 Year Plus Experience, I am a web developer with knowledge of multiple back-end platforms Like PHP, Node.js, Python and frontend JavaScript frameworks Like Angular, React, and Vue.

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