Flutter The argument type ‘Listenable‘ can‘t be assigned to the parameter type ‘Animation＜double＞

在该build方法的第一行，生成此分析器警告

A value of type 'Listenable' can't be assigned to a variable of type 'Animation<double>'.
Try changing the type of the variable, or casting the right-hand type to 'Animation<double>'.
dart(invalid_assignment)

应该修改为：

final Animation<double> animation = listenable as Animation<double>;

有bug的代码：

class AnimatedLogo extends AnimatedWidget {AnimatedLogo({Key? key, required Animation<double> animation}): super(key: key, listenable: animation);@overrideWidget build(BuildContext context) {final Animation<double> animation = listenable;return new Center(child: new Container(margin: new EdgeInsets.symmetric(vertical: 10.0),height: animation.value,width: animation.value,child: new FlutterLogo(),));}
}

修改后的代码：

class AnimatedLogo extends AnimatedWidget {AnimatedLogo({Key? key, required Animation<double> animation}): super(key: key, listenable: animation);@overrideWidget build(BuildContext context) {final Animation<double> animation = listenable as Animation<double>;return new Center(child: new Container(margin: new EdgeInsets.symmetric(vertical: 10.0),height: animation.value,width: animation.value,child: new FlutterLogo(),));}
}

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Flutter The argument type ‘Listenable‘ can‘t be assigned to the parameter type ‘Animation＜double＞

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