class MovieListState extends State {

String movieType;

String typeName;

List movieList = new List();

int currentPage = 0; //第一页

int pageSize = 10; //页容量

int totalSize = 0; //总条数

String loadMoreText = “没有更多数据”;

TextStyle loadMoreTextStyle =

new TextStyle(color: const Color(0xFF999999), fontSize: 14.0);

TextStyle titleStyle =

new TextStyle(color: const Color(0xFF757575), fontSize: 14.0);

//初始化滚动监听器，加载更多使用

ScrollController _controller = new ScrollController();

/**

• 构造器接收（MovieList）数据

*/

MovieListState({Key key, this.movieType}) {

//固定写法，初始化滚动监听器，加载更多使用

_controller.addListener(() {

var maxScroll = _controller.position.maxScrollExtent;

var pixel = _controller.position.pixels;

if (maxScroll == pixel && movieList.length < totalSize) {

setState(() {

loadMoreText = “正在加载中…”;

loadMoreTextStyle =

new TextStyle(color: const Color(0xFF4483f6), fontSize: 14.0);

});

loadMoreData();

} else {

setState(() {

loadMoreText = “没有更多数据”;

loadMoreTextStyle =

new TextStyle(color: const Color(0xFF999999), fontSize: 14.0);

});

}

});

}

//加载列表数据

loadMoreData() async {

this.currentPage++;

var start = (currentPage - 1) * pageSize;

var url =

“https://api.douban.com/v2/movie/$movieType?start=$start&count=$pageSize”;

Dio dio = new Dio();

Response response = await dio.get(url);

setState(() {

movieList.addAll(response.data[“subjects”]);

totalSize = response.data[“total”];

});

}

@override

void initState() {

super.initState();

//设置当前导航栏的标题

switch (movieType) {

case “in_theaters”:

typeName = “正在热映”;

break;

case “coming_soon”:

typeName = “即将上映”;

break;

case “top250”:

typeName = “Top250”;

break;

}

//加载第一页数据

loadMoreData();

}

/**

• 下拉刷新,必须异步async不然会报错

*/

Future _pullToRefresh() async {

currentPage = 0;

movieList.clear();

loadMoreData();

return null;

}

@override

Widget build(BuildContext context) {

// TODO: implement build

return new Scaffold(

backgroundColor: Colors.white,

appBar: new AppBar(

leading: new IconButton(

icon: const Icon(Icons.arrow_back),

onPressed:null ,

),

title: new Text(typeName != null ? typeName : “正在加载中…”,

style: new TextStyle(color: Colors.black)),

backgroundColor: Colors.white,

),

body: movieList.length == 0

? new Center(child: new CircularProgressIndicator())

new RefreshIndicator(

color: const Color(0xFF4483f6),

//下拉刷新

child: ListView.builder(

itemCount: movieList.length + 1,

itemBuilder: (context, index) {

if (index == movieList.length) {

return _buildProgressMoreIndicator();

} else {

return renderRow(index, context);

}

},

controller: _controller, //指明控制器加载更多使用

),

onRefresh: _pullToRefresh,

),

);

}

/**

• 加载更多进度条

*/

Widget _buildProgressMoreIndicator() {

return new Padding(

padding: const EdgeInsets.all(15.0),

child: new Center(

child: new Text(loadMoreText, style: loadMoreTextStyle),

),

);

}

/**

• 列表的ltem

*/

renderRow(index, context) {

var movie = movieList[index];

var id = movie[“id”];

var title = movie[“title”];

var type = movie[“genres”].join("、");

var year = movie[“year”];

var score = movie[“rating”][“average”];

return new Container(

height: 200,

color: Colors.white,

child: new InkWell(

onTap: () {

Navigator.of(context).push(new MaterialPageRoute(

builder: (ctx) => new MovieDetail(movieId: id)));

},

child: new Column(

children: [

new Container(

height: 199,

// color: Colors.blue,

child: new Row(

children: [

new Container(

width: 120.0,

height: 180.0,

margin: const EdgeInsets.all(10.0),

child: Image.network(movie[“images”][“small”]),

),

Expanded(

child: new Container(
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