flutter: type 'List<dynamic>' is not a subtype of type 'List<Movie>'

import 'package:flutter/material.dart';
import 'dart:convert';
import 'package:http/http.dart' as http;
import 'package:provider/provider.dart';
import '../config.dart';
import '../widgets/movie_card.dart';
import '../providers/search_movie.dart';
import '../providers/movie.dart';

class SearchMovieScreen extends StatelessWidget {

  @override
  Widget build(BuildContext context) {
    final moviesData = Provider.of<SearchMovie>(context);
    final searchedMovies = moviesData.movies;

    return ChangeNotifierProvider<SearchMovie>(
      create: (_) => SearchMovie(),
      child: Consumer<SearchMovie>(
        builder: (context, model, child) {
          return Scaffold(
            body: Container(
                child: Column(
              children: <Widget>[
                TextField(
                  onChanged: (inputText) {
                    print(inputText);
                    model.text = inputText;
                    model.search();
                  },
                  decoration: InputDecoration(
                      prefixIcon: Icon(
                        Icons.search,
                        color: Colors.grey,
                      ),
                      hintText: 'タイトルを入れてね'),
                ),
                Expanded(
                  child: ListView.builder(
                      scrollDirection: Axis.vertical,
                      itemCount: model.movies.length,
                      itemBuilder: (BuildContext context, int index) {
                        return Container(
                          padding: EdgeInsets.all(20),
                          child: Column(
                            children: <Widget>[
                              MovieCard(
                                searchedMovies[index].title,
                                searchedMovies[index].releaseDate,
                                searchedMovies[index].overview,
                                searchedMovies[index].posterPath,
                              ),
                            ],
                          ),
                        );
                      }),
                )
              ],
            )),
          );
        },
      ),
    );
  }
}

import 'package:flutter/material.dart';

class Movie with ChangeNotifier {
  int voteCount;
  int id;
  bool video;
  num voteAverage;
  String title;
  double popularity;
  String posterPath;
  String originalLanguage;
  String originalTitle;
  String backdropPath;
  bool adult;
  String overview;
  String releaseDate;

  Movie({
    this.voteCount,
    this.id,
    this.video,
    this.voteAverage,
    this.title,
    this.popularity,
    this.posterPath,
    this.originalLanguage,
    this.originalTitle,
    this.backdropPath,
    this.adult,
    this.overview,
    this.releaseDate,
  });

// 参考にしたコードに書いてあったが、どうやって使うのかわからない。。。
  static Movie fromJson(Map<String, dynamic> json) {
    return Movie(
      voteCount: json['vote_count'],
      id: json['id'],
      video: json['video'],
      voteAverage: json['vote_average'],
      title: json['title'],
      popularity: json['popularity'],
      posterPath: json['poster_path'],
      originalLanguage: json['original_language'],
      originalTitle: json['original_title'],
      backdropPath: json['backdrop_path'],
      adult: json['adult'],
      overview: json['overview'],
      releaseDate: json['release_date'],
    );
  }
}

import 'package:flutter/material.dart';
import 'dart:convert';
import 'package:http/http.dart' as http;
import '../config.dart';
import './movie.dart';

class SearchMovie with ChangeNotifier {
  String text = '';

  List<Movie> _movies = [];

  List<Movie> get movies {
    return [..._movies];
  }

  search() async {
    if (this.text.isNotEmpty) {
      var searchUrl =
           '${MOVIE_DB_BASE_URL}/search/movie?api_key=${API_KEY}&language=en-US&query=${text}&page=1';

      try {
        final response = await http.get(searchUrl);
        final List<Movie> extractedData = json.decode(response.body)['results'];
        if (extractedData == null) {
          print('nothing to get');
          return;
        }

        _movies = extractedData;
        notifyListeners();
      } catch (error) {
        print(error);
        throw (error);
      }
    }
  }
}

final List<Movie> extractedData = json.decode(response.body)['results'];