android - Flutter - 在一个屏幕上显示两个 ListView

Question

我正在尝试在另一个垂直 listView.builder 之上添加一个水平 listView.builder。两个 listViews 都应该有 text 在两者之上。

这是我到目前为止所做的，只有顶部水平 listView.builder 被绘制，当我尝试点击bottom 垂直 listView.builder 应该被绘制，应用程序在调试中崩溃，我收到错误:NoSuchMethodError: The getter 'visible' was called on空。

另外，我不知道如何添加两个 text 字段，所以我把它们省略了。

我有很多代码，如果您需要查看更多代码，请这样做 here

Widget _cryptoWidget() {
return new Container(
    child: new Column(
      children: <Widget>[
        new Flexible(
          child: new ListView.builder(
              scrollDirection: Axis.horizontal,
              itemBuilder: (BuildContext context, int index) {
              return _listViewFiller();
            }
          ),
        ),
        new Flexible(
          child: new RefreshIndicator(
          key: refreshKey,
          child: new ListView.builder(
            scrollDirection: Axis.horizontal,
            itemCount: _currencies.length,
            itemBuilder: (BuildContext context, int index) {
              final int i = index ~/ 2;
              final Crypto currency = _currencies[i];
              final MaterialColor color = _colors[i % _colors.length];
              if (index.isOdd) {
                return new Divider();
              }
              return _getListItemUi(currency, color);
            },
          ),
          onRefresh:refreshList,
        ),
        )
      ],
    )
  );
 }

Answer 1

import 'package:flutter/material.dart';
import 'background.dart';

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

class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return new MaterialApp(
  title: 'Flutter Demo',
  theme: new ThemeData(
    primarySwatch: Colors.blue,
  ),
  debugShowCheckedModeBanner: false,
  home: new MyHomePage(title: 'Popular'),
);
}
}

class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);

final String title;

@override
_MyHomePageState createState() => new _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
List<String> items = [
"Item 1",
"Item 2",
"Item 3",
"Item 4",
"Item 5",
"Item 6",
"Item 7",
"Item 8"
];

@override
Widget build(BuildContext context) {
final _width = MediaQuery.of(context).size.width;
final _height = MediaQuery.of(context).size.height;

final headerList = new ListView.builder(
  itemBuilder: (context, index) {
    EdgeInsets padding = index == 0?const EdgeInsets.only(
        left: 20.0, right: 10.0, top: 4.0, bottom: 30.0):const EdgeInsets.only(
        left: 10.0, right: 10.0, top: 4.0, bottom: 30.0);
    
    return new Padding(
      padding: padding,
      child: new InkWell(
        onTap: () {
          print('Card selected');
        },
        child: new Container(
          decoration: new BoxDecoration(
            borderRadius: new BorderRadius.circular(10.0),
            color: Colors.lightGreen,
            boxShadow: [
              new BoxShadow(
                  color: Colors.black.withAlpha(70),
                  offset: const Offset(3.0, 10.0),
                  blurRadius: 15.0)
            ],
            image: new DecorationImage(
              image: new ExactAssetImage(
                  'assets/img_${index%items.length}.jpg'),
              fit: BoxFit.fitHeight,
            ),
          ),
        //                                    height: 200.0,
          width: 200.0,
          child: new Stack(
            children: <Widget>[
              new Align(
                alignment: Alignment.bottomCenter,
                child: new Container(
                    decoration: new BoxDecoration(
                        color: const Color(0xFF273A48),
                        borderRadius: new BorderRadius.only(
                            bottomLeft: new Radius.circular(10.0),
                            bottomRight: new Radius.circular(10.0))),
                    height: 30.0,
                    child: new Row(
                      mainAxisAlignment: MainAxisAlignment.center,
                      children: <Widget>[
                        new Text(
                          '${items[index%items.length]}',
                          style: new TextStyle(color: Colors.white),
                        )
                      ],
                    )),
              )
            ],
          ),
        ),
      ),
    );
  },
  scrollDirection: Axis.horizontal,
  itemCount: items.length,
);

final body = new Scaffold(
  appBar: new AppBar(
    title: new Text(widget.title),
    elevation: 0.0,
    backgroundColor: Colors.transparent,
    actions: <Widget>[
      new IconButton(icon: new Icon(Icons.shopping_cart, color: Colors.white,), onPressed: (){})
    ],
  ),
  backgroundColor: Colors.transparent,
  body: new Container(
    child: new Stack(
      children: <Widget>[
        new Padding(
          padding: new EdgeInsets.only(top: 10.0),
          child: new Column(
            crossAxisAlignment: CrossAxisAlignment.center,
            mainAxisSize: MainAxisSize.max,
            mainAxisAlignment: MainAxisAlignment.start,
            children: <Widget>[
              new Align(
                alignment: Alignment.centerLeft,
                child: new Padding(
                    padding: new EdgeInsets.only(left: 8.0),
                    child: new Text(
                      'Recent Items',
                      style: new TextStyle(color: Colors.white70),
                    )),
              ),
              new Container(
                  height: 300.0, width: _width, child: headerList),
              new Expanded(child:
              ListView.builder(itemBuilder: (context, index) {
                return new ListTile(
                  title: new Column(
                    children: <Widget>[
                      new Row(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: <Widget>[
                          new Container(
                            height: 72.0,
                            width: 72.0,
                            decoration: new BoxDecoration(
                                color: Colors.lightGreen,
                                boxShadow: [
                                  new BoxShadow(
                                      color:
                                      Colors.black.withAlpha(70),
                                      offset: const Offset(2.0, 2.0),
                                      blurRadius: 2.0)
                                ],
                                borderRadius: new BorderRadius.all(
                                    new Radius.circular(12.0)),
                                image: new DecorationImage(
                                  image: new ExactAssetImage(
                                    'assets/img_${index%items.length}.jpg',
                                  ),
                                  fit: BoxFit.cover,
                                )),
                          ),
                          new SizedBox(
                            width: 8.0,
                          ),
                          new Expanded(
                              child: new Column(
                                mainAxisAlignment:
                                MainAxisAlignment.start,
                                crossAxisAlignment:
                                CrossAxisAlignment.start,
                                children: <Widget>[
                                  new Text(
                                    'My item header',
                                    style: new TextStyle(
                                        fontSize: 14.0,
                                        color: Colors.black87,
                                        fontWeight: FontWeight.bold),
                                  ),
                                  new Text(
                                    'Item Subheader goes here\nLorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry',
                                    style: new TextStyle(
                                        fontSize: 12.0,
                                        color: Colors.black54,
                                        fontWeight: FontWeight.normal),
                                  )
                                ],
                              )),
                          new Icon(
                            Icons.shopping_cart,
                            color: const Color(0xFF273A48),
                          )
                        ],
                      ),
                      new Divider(),
                    ],
                  ),
                );
              }))
            ],
          ),
        ),
      ],
    ),
  ),
);

return new Container(
  decoration: new BoxDecoration(
    color: const Color(0xFF273A48),
  ),
  child: new Stack(
    children: <Widget>[
      new CustomPaint(
        size: new Size(_width, _height),
        painter: new Background(),
        ),
       body,
      ],
    ),
  );
 }
}

一个很好的例子，这里有完整的源代码 Styled list