如何在 Flutter 中指定 ListTile 高度

Question

在这段代码中，我试图在页面的最顶部制作一个按钮或图块列表，“因为按钮对我来说效果不佳”。因此，当点击它时，它 returns 页面其余部分的一个值。

问题是此处的图块占据了页面的一半以上，这使得它看起来不一致。我想限制瓷砖的高度，我试过将它们放在一排和一个容器中，但它不起作用。任何帮助将不胜感激。

运行代码后的结果是：

这是运行代码后的错误：

class HomePage extends StatefulWidget {
 // const HomePage({Key key}) : super(key: key);

  @override
  HomePageState createState() {
    return new HomePageState();
  }
}

class HomePageState extends State<HomePage> {
List<String> temp=new List();
List<String> temp1=['Nile University', 'Smart Village', 'Zewail'];
Map<String,String> map1={};
@override
void initState() {
    super.initState();
  getplaces(temp);
  getuser(map1,'1jKpg81YCO5PoFOa2wWR');

  }


Future<List> getuser(temp,String place) async{
  List<String> userids=[];
  QuerySnapshot usersubs= await  Firestore.instance.collection('tempSubs').getDocuments();
  QuerySnapshot userid= await  Firestore.instance.collection('users').where('place',isEqualTo: place).getDocuments();
  userid.documents.forEach((DocumentSnapshot doc,){
  usersubs.documents.forEach((DocumentSnapshot doc1){
    if(doc.documentID==doc1.documentID){
      doc1.data['products'].forEach((k,v){
       
       if( DateTime.fromMillisecondsSinceEpoch(v).day==DateTime.now().day){

        int x= DateTime.fromMillisecondsSinceEpoch(v).day;
                print('keey equal $k and v is $x');

        print('dy is $x');
      userids.add(
      doc.documentID);
       }
      });
      
    }
  } ); }  
    );
              print('doc.documentID');
  print (userids);
   setState(() {});
 return userids;
  }


Future<List> getplaces(temp) async{
    QuerySnapshot place= await  Firestore.instance.collection('places').getDocuments();
  place.documents.forEach((DocumentSnapshot doc){
    temp.add(
      doc.data['name']
    );
            //  print(doc.data['name']);

  });
  //  print(temp);
 
   setState(() {});
 return temp;
  }



  @override
  Widget build(BuildContext context) {
      return Scaffold(
      appBar: AppBar(
         title: Text("Home Page"),
        ),
          
  body: !temp.isNotEmpty? 
   CircularProgressIndicator():  
   Row(mainAxisSize:MainAxisSize.max,
   mainAxisAlignment: MainAxisAlignment.spaceAround,

     children:<Widget>[ 
        Container(
                      height: 100.0,
                      child:
           ListView.builder(
             scrollDirection: Axis.horizontal,
             itemExtent: 100.0,
             itemCount:temp.length,
             itemBuilder:(BuildContext context, int index) {
                return ListTile(title: Text(temp[index]),onTap:
                (){
                  print(temp[index]);
                }
                 );}
     ),),
     Container(child:Text('data'),)
    ],),
       
        );
          
        }
}

Answer 1

只需删除 Expanded 小部件以避免填充可用的 space 并使用具有固定高度的父容器，与 itemExtent 值相同：

    Column(
                  children: <Widget>[
                    Container(
                      height: 100.0,
                      child: ListView.builder(
                          scrollDirection: Axis.horizontal,
                          itemExtent: 100.0,
                          itemCount: temp.length,
                          itemBuilder: (BuildContext context, int index) {
                            return ListTile(
                                title: Text(temp[index]),
                                onTap: () {
                                  print(temp[index]);
                                });
                          }),
                    ),
                    Container(
                      child: Text('data'),
                    )
                  ],
                ),

Answer 2

如果您需要更多自定义，您应该使用容器或填充而不是 ListTile。

您无法设置高度，但可以通过将 dense 属性设置为 true 来使其变小：

ListView.builder(
          scrollDirection: Axis.vertical,
          shrinkWrap: true,
          itemCount: list.length,
          itemBuilder: (context, index) {
            return ListTile(
              title: Text(list[index].name,style: TextStyle(fontSize: 20.0),),
              contentPadding: EdgeInsets.symmetric(vertical: 0.0, horizontal: 16.0),
              dense:true,                  
            );
          },
        );

ListTile:

A single fixed-height row that typically contains some text as well as a leading or trailing icon.

To be accessible, tappable leading and trailing widgets have to be at least 48x48 in size. However, to adhere to the Material spec, trailing and leading widgets in one-line ListTiles should visually be at most 32 (dense: true) or 40 (dense: false) in height, which may conflict with the accessibility requirement.

For this reason, a one-line ListTile allows the height of leading and trailing widgets to be constrained by the height of the ListTile. This allows for the creation of tappable leading and trailing widgets that are large enough, but it is up to the developer to ensure that their widgets follow the Material spec.

https://api.flutter.dev/flutter/material/ListTile-class.html

Answer 3

由于 ListTile 中没有高度属性，您可以通过将其放置在 SizedBox 中来限制图块的大小：

          SizedBox(
              height: 32,
              child: ListTile(..))

Answer 4

应用VisualDensity 允许您扩展或收缩列表图块的高度。 VisualDensity 是 UI 元素的紧凑度。这是一个例子：

// negative value to contract
ListTile(
  title: Text('Tile title'),
  dense: true,
  visualDensity: VisualDensity(vertical: -3), // to compact
  onTap: () {
    // tap actions
  },
)

// positive value to expand
ListTile(
  title: Text('Tile title'),
  dense: true,
  visualDensity: VisualDensity(vertical: 3), // to expand
  onTap: () {
    // tap actions
  },
)

值的范围从 -4 到 4，在撰写此答案时默认值为 0。

但是，您不能将此方法用于特定的宽度或高度尺寸。

如何在 Flutter 中指定 ListTile 高度

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