android – 在flutter app中添加图片

>在哪里创建图像文件夹？
>在pubspec.ymal中添加资产标签的位置？
>这需要资产文件夹吗？

我尝试了什么：

assets:
    - images/lake.jpg

在pubspec.ymal里面：

完整档案：

name: my_flutter_app
description: A new Flutter application.

dependencies:
  flutter:
    sdk: flutter

  cupertino_icons: ^0.1.2

dev_dependencies:
  flutter_test:
    sdk: flutter

flutter:
  uses-material-design: true,assets:
    - images/lake.jpg

错误日志：

#/properties/flutter/properties/uses-material-design: type: wanted [boolean] got true,Error detected in pubspec.yaml:
Error building assets

FAILURE: Build failed with an exception.

* Where:
Script '/home/abc/Downloads/flutter/packages/flutter_tools/gradle/flutter.gradle' line: 435

* What went wrong:
Execution failed for task ':app:flutterBuildDebug'.
> Process 'command '/home/abc/Downloads/flutter/bin/flutter'' finished with non-zero exit value 1

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

* Get more help at https://help.gradle.org

BUILD FAILED in 1s
Finished with error: Gradle build failed: 1

我的main.dart代码：

// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'package:flutter/material.dart';
// Uncomment lines 7 and 10 to view the visual layout at runtime.
//import 'package:flutter/rendering.dart' show debugPaintSizeEnabled;

void main() {
  //debugPaintSizeEnabled = true;
  runApp(new MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    Widget titleSection = new Container(
      padding: const EdgeInsets.all(32.0),child: new Row(
        children: [
          new Expanded(
            child: new Column(
              crossAxisAlignment: CrossAxisAlignment.start,children: [
                new Container(
                  padding: const EdgeInsets.only(bottom: 8.0),child: new Text(
                    'Oeschinen Lake Campground',style: new TextStyle(
                      fontWeight: FontWeight.bold,),new Text(
                  'Kandersteg,Switzerland',style: new TextStyle(
                    color: Colors.grey[500],],new Icon(
            Icons.star,color: Colors.red[500],new Text('41'),);

    Column buildButtonColumn(IconData icon,String label) {
      Color color = Theme.of(context).primaryColor;

      return new Column(
        mainAxisSize: MainAxisSize.min,mainAxisAlignment: MainAxisAlignment.center,children: [
          new Icon(icon,color: color),new Container(
            margin: const EdgeInsets.only(top: 8.0),child: new Text(
              label,style: new TextStyle(
                fontSize: 12.0,fontWeight: FontWeight.w400,color: color,);
    }

    Widget buttonSection = new Container(
      child: new Row(
        mainAxisAlignment: MainAxisAlignment.spaceEvenly,children: [
          buildButtonColumn(Icons.call,'CALL'),buildButtonColumn(Icons.near_me,'ROUTE'),buildButtonColumn(Icons.share,'SHARE'),);

    Widget textSection = new Container(
      padding: const EdgeInsets.all(32.0),child: new Text(
        '''
Lake Oeschinen lies at the foot of the Blüemlisalp in the Bernese Alps. Situated 1,578 meters above sea level,it is one of the larger Alpine Lakes. A gondola ride from Kandersteg,followed by a half-hour walk through pastures and pine forest,leads you to the lake,which warms to 20 degrees Celsius in the summer. Activities enjoyed here include rowing,and riding the summer toboggan run.
        ''',softWrap: true,);

    return new MaterialApp(
      title: 'Flutter Demo',home: new Scaffold(
        appBar: new AppBar(
          title: new Text('Top Lakes'),body: new ListView(
          children: [
            new Image.asset(
              'images/lake.jpg',width: 600.0,height: 240.0,fit: BoxFit.cover,titleSection,buttonSection,textSection,);
  }
}

我指的是这个教程https://flutter.io/tutorials/layout/

另外我想问一下,有什么工具可以在颤动中进行干净的重建,因为我找不到任何选择.

任何帮助,将不胜感激.

谢谢 ！