Flutter中ListView 的使用示例

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

loadData() async {
 String loadRUL = "https://api.douban.com/v2/movie/in_theaters";
 http.Response response = await http.get(loadRUL);
 var result = json.decode(response.body);
 setState(() {
  title = result['title'];
  print('title: $title');
  subjects = result['subjects'];
 });
 }

getBody() {
 if (subjects.length != 0) {
  return ListView.builder(
   itemCount: subjects.length,
   itemBuilder: (BuildContext context, int position) {
   return getItem(subjects[position]);
   });
 } else {
  // 加载菊花
  return CupertinoActivityIndicator();
 }
 }

getItem(var subject) {
// 演员列表
 var avatars = List.generate(subject['casts'].length, (int index) =>
  Container(
   margin: EdgeInsets.only(left: index.toDouble() == 0.0 ? 0.0 : 16.0),

   child: CircleAvatar(
    backgroundColor: Colors.white10,
    backgroundImage: NetworkImage(
     subject['casts'][index]['avatars']['small']
    )
   ),
  ),
 );
 var row = Container(
  margin: EdgeInsets.all(4.0),
  child: Row(
  children: <Widget>[
   ClipRRect(
   borderRadius: BorderRadius.circular(4.0),
   child: Image.network(
    subject['images']['large'],
    width: 100.0, height: 150.0,
    fit: BoxFit.fill,
   ),
   ),
   Expanded(
    child: Container(
    margin: EdgeInsets.only(left: 8.0),
    height: 150.0,
    child: Column(
     crossAxisAlignment: CrossAxisAlignment.start,
     children: <Widget>[
//     电影名称
     Text(
      subject['title'],
      style: TextStyle(
      fontWeight: FontWeight.bold,
      fontSize: 20.0,
      ),
      maxLines: 1,
     ),
//     豆瓣评分
     Text(
      '豆瓣评分：${subject['rating']['average']}',
      style: TextStyle(
       fontSize: 16.0
      ),
     ),
//     类型
     Text(
      "类型：${subject['genres'].join("、")}"
     ),
//     导演
     Text(
      '导演：${subject['directors'][0]['name']}'
     ),
//     演员
     Container(
      margin: EdgeInsets.only(top: 8.0),
      child: Row(
      children: <Widget>[
       Text('主演：'),
       Row(
       children: avatars,
       )
      ],
      ),
     )
     ],
    ),
    )
   )
  ],
  ),
 );
 return Card(
  child: row,
 );
 }