'The library 'package:flutter/material.dart' is legacy, and should not be imported into a null safe library

I have a null-safe library and in the example folder I'm using the following import:

import 'package:flutter/material.dart';

However, the linter is giving me the following warning:

The library 'package:flutter/material.dart' is legacy, and should not be imported into a null safe library. Try migrating the imported library. import_of_legacy_library_into_null_safe

The example project's pubspec.yaml file specifies the beta version of the Dart SDK:

environment:
  sdk: ">=2.12.0-29.10.beta <3.0.0"

dependencies:
  flutter:
    sdk: flutter
  my_library:
    path: ../

Hasn't material.dart already been converted by now? Do I need to add something else to pubspec.yaml or just wait for the stable release to come out?

Solution 1:^[1]

The fix for this is relatively simple. Just go to your pubspec.yaml file and make sure the lottie dependancy that you have there, is the latest version as on the pub.dev site.

Solution 2:^[2]

Use dart pub outdated --mode=null-safety and then dart pub upgrade --null-safety to upgrade all your dependencies to null-safety.

For more details go to https://dart.dev/null-safety/migration-guide.

Solution 3:^[3]

Currently, on 8/29/2021, auto_size_text package also keeps giving this alert, because I was using the Null Safety versions of Dart - 2.12.0, and to solve this, I looked in the package documentation and saw that I had a Prerelease version to Null Safety - launch, so I used it.

dependencies:
  auto_size_text: ^3.0.0-nullsafety.0

Solution 4:^[4]

[![The library 'package:flutter_/.dart' is legacy, and should not be imported into a null safe library. Try migrating the imported library.

Open run/debug option -> select edit configuration as shown in image one.]1]1

.imgur.com/A9aEb.png

Solution 5:^[5]

I was facing the same problem with the Adhan Dart package, when i read the documentation on the package site , i had the Prereleased version so i made changes to the dependences as adhan: ^2.0.0-nullsafety.2 and it worked.

For more details:https://pub.dev/packages/adhan/versions/2.0.0-nullsafety.1

Solution 6:^[6]

go to https://pub.dev/packages/font_awesome_flutter,

copy the latest release version of font i.e in my case (font_awesome_flutter: ^9.1.0),

then add it to your pubspec.yaml file i.e (font_awesome_flutter: ^9.1.0),

click pub get dependencies

go to your input_page file

click get dependencies

Solution 7:^[7]

Copy the latest version of the package which is giving the error from http://pub.dev/ and paste it in the pubspec.yaml file.

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution	Source
Solution 1	Yash Mathur
Solution 2	Susanta Kumar Behera
Solution 3	Felipe Sales
Solution 4	Mohan Kumar N
Solution 5	KhuzaimaA
Solution 6	Ian Brian Trevor Kibet
Solution 7	Mahwish -

'The library 'package:flutter/material.dart' is legacy, and should not be imported into a null safe library

Solution 1:[1]

Solution 2:[2]

Solution 3:[3]

Solution 4:[4]

Solution 5:[5]

Solution 6:[6]

Solution 7:[7]