我只想展示动画电影.我编写的代码只过滤掉动画电影,但却出现了一些错误.

import 'package:flutter/material.dart';

void main() => runApp(new MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Flutter Demo',theme: new ThemeData(

        primarySwatch: Colors.blue,),home: new HomePage(),);
  }
}

class Movie {
  Movie({this.movieName,this.isAnimated,this.rating});
  final String movieName;
  final bool isAnimated;
  final double rating;
}

List<Movie> AllMovies = [
  new Movie(movieName: "Toy Story",isAnimated: true,rating: 4.0),new Movie(movieName: "How to Train Your Dragon",new Movie(movieName: "Hate Story",isAnimated: false,rating: 1.0),new Movie(movieName: "Minions",];



class HomePage extends StatefulWidget{
  @override
  _homePageState createState() => new _homePageState();
}


class _homePageState extends State<HomePage> {

  List<Movie> _AnimatedMovies = null;

  @override
  void initState() {
    super.initState();
    _AnimatedMovies = AllMovies.where((i) => i.isAnimated);
  }

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      body: new Container(
        child: new Text(
            "All Animated Movies here"
        ),);
  }
}