flutter - Flutter中的LinearGradient？

Question

我正在尝试在我的应用中使用Github的代码，但不确定为什么会显示一些错误。稍后使用的类。它说LinearGradient有一个问题(“颜色，未定义”)，但只是检查了Flutter的源代码，并且具有此属性。

import 'package:flutter/material.dart';

class Palette {
  static const Color scaffold = Color(0xFFF0F2F5);

  static const Color facebookBlue = Color(0xFF1777F2);

  static const Gradient createRoomGradient = LinearGradient(
    colors: [Color(0xFF496AE1), Color(0xFFCE48B1)],
  );

  static const Color online = Color(0xFF4BCB1F);

  static const LinearGradient storyGradient = LinearGradient(
    begin: Alignment.topCenter,
    end: Alignment.bottomCenter,
    colors: [Colors.transparent, Colors.black26],
  );
}

    

Answer 1

此解决方案为我工作:
https://github.com/flutter/flutter/issues/67084#issuecomment-702397222

in your pubspec.yml

change this to :

environment: sdk: ">=2.8.0 <3.0.0" and flutter pub get

i'm using android studio, then i invalidate cache and restart, done!