使用列表视图为我的 Flutter 项目构建 UI 界面

如何解决使用列表视图为我的 Flutter 项目构建 UI 界面

我正在尝试为 Flutter 界面编写 UI 代码，并且一切顺利，直到我添加了“ListView”小部件。我试图编译代码，它说构建成功完成。但是当我运行它时，Virtual Android 屏幕加载了一点，然后变黑了。我尝试了几次，但无济于事。请任何人都可以帮助我使用此代码：

import 'package:Flutter/material.dart';
import 'package:Flutter/rendering.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Stateful Clicker Counter',theme: ThemeData(
        primarySwatch: Colors.blue,),home: MyHomePage(title: 'Flutter Demo Clicker Counter Home Page'),);
  }
}

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

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.start,children: <Widget>[
            Row(
              mainAxisAlignment: MainAxisAlignment.spaceAround,children: <Widget>[
                Padding(
                  padding: const EdgeInsets.only(top: 50.0),child: FloatingActionButton(
                    onpressed: _incrementCounter,tooltip: 'Increment',child: Icon(
                      Icons.play_arrow,size: 50.0,//Icon
                  ),//Floatingactionbutton
                ),//Padding
                Padding(
                  padding: const EdgeInsets.only(top: 50.0),child: Icon(
                      Icons.pause,child: Icon(
                      Icons.mic,//FloatingactionButton
                ),//Padding
                ListView(
                  padding: const EdgeInsets.all(5.0),children: <Widget>[
                    Container(
                      height: 30.0,color: Colors.Amber[600],child: const Center(
                        child: Text(
                          'Entry A',//Text
                        ),//Center
                    ),//Container
                    Container(
                      height: 30.0,color: Colors.Amber[500],child: const Center(
                        child: Text(
                          'Entry B',color: Colors.Amber[100],child: const Center(
                        child: Text(
                          'Entry C',//Text
                      ),//Container
                  ],//End of Widget tree
                ),//ListView
              ],//End of submain Widget Tree
            ),//Row
          ],//End of Main Widget Tree
        ),//Column
      ),//Main Center
    ); //Scaffold
  }
}

P.S：我刚开始使用 Flutter，所以有些事情可能看起来没有必要

解决方法

基于this post

尝试在 ListView 中添加 Container

更新：

现在这段代码应该可以工作了。问题是，您在 ListView 中添加了 Row 而不是在 Column

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

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Stateful Clicker Counter',theme: ThemeData(
        primarySwatch: Colors.blue,),home: MyHomePage(title: 'Flutter Demo Clicker Counter Home Page'),);
  }
}

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

  final String? title;

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

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title!),body: Column(
          mainAxisAlignment: MainAxisAlignment.start,children: <Widget>[
            Row(
              mainAxisAlignment: MainAxisAlignment.spaceAround,children: <Widget>[
                Padding(
                  padding: const EdgeInsets.only(top: 50.0),child: FloatingActionButton(
                    onPressed: _incrementCounter,tooltip: 'Increment',child: Icon(
                      Icons.play_arrow,size: 50.0,//Icon
                  ),//Floatingactionbutton
                ),//Padding
                Padding(
                  padding: const EdgeInsets.only(top: 50.0),child: Icon(
                      Icons.pause,child: Icon(
                      Icons.mic,//FloatingactionButton
                ),//Padding
              ],//End of submain Widget Tree
            ),//Row
            Expanded(
              child: ListView(
                  children: <Widget>[
                    Container(
                      height: 10.0,color: Colors.amber[600],child: const Center(
                        child: Text(
                          'Entry A',//Text
                        ),//Center
                    ),//Container
                    Container(
                      height: 10.0,color: Colors.amber[500],child: const Center(
                        child: Text(
                          'Entry B',color: Colors.amber[100],child: const Center(
                        child: Text(
                          'Entry C',//Text
                      ),//Container
                  ],//End of Widget tree
                ),//ListView,)
          ],//End of Main Widget Tree
        ),); //Scaffold
  }
}