)

)

),

);

}

}

2.创建文件夹 images（将图片丢进去）

3.pubspec.yaml（添加下方代码）

name: flutter_alluse

description: A new Flutter application.

The following defines the version and build number for your application.

A version number is three numbers separated by dots, like 1.2.43

followed by an optional build number separated by a +.

Both the version and the builder number may be overridden in flutter

build by specifying --build-name and --build-number, respectively.

In Android, build-name is used as versionName while build-number used as versionCode.

Read more about Android versioning at https://developer.android.com/studio/publish/versioning

In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.

Read more about iOS versioning at

https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html

version: 1.0.0+1

environment:

sdk: ">=2.1.0 <3.0.0"

dependencies:

flutter:

sdk: flutter

The following adds the Cupertino Icons font to your application.

Use with the CupertinoIcons class for iOS style icons.

cupertino_icons: ^0.1.2

dev_dependencies:

flutter_test:

sdk: flutter

For information on the generic Dart part of this file, see the

following page: https://www.dartlang.org/tools/pub/pubspec

The following section is specific to Flutter.

flutter:

The following line ensures that the Material Icons font is

included with your application, so that you can use the icons in

the material Icons class.

uses-material-design: true

To add assets to your application, add an assets section, like this:

assets:

- images/a_dot_burr.jpeg

- images/a_dot_ham.jpeg

添加如下代码

assets:

• images/1.jpg

An image asset can refer to one or more resolution-specific "variants", see

https://flutter.dev/assets-and-images/#resolution-aware.

For details regarding adding assets from package dependencies, see

https://flutter.dev/assets-and-images/#from-packages

To add custom fonts to your application, add a fonts section here,

in this "flutter" section. Each entry in this list should have a

"family" key with the font family name, and a "fonts" key with a

list giving the asset and other descriptors for the font. For

example:

fonts:

- family: Schyler

fonts:

- asset: fonts/Schyler-Regular.ttf

- asset: fonts/Schyler-Italic.ttf

style: italic

- family: Trajan Pro

fonts:

- asset: fonts/TrajanPro.ttf

- asset: fonts/TrajanPro_Bold.ttf

weight: 700

For details regarding fonts from package dependencies,

see https://flutter.dev/custom-fonts/#from-packages

fonts:

• family: AguafinaScript

fonts:

• asset: fonts/AguafinaScript-Regular.ttf

4.解释源代码

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget{

@override

Widget build(BuildContext context ){

return MaterialApp(

title:'All Widget Usages',

home:Scaffold(

body:

Center(

child:

Column(

children: <Widget>[

//Asset 第一种方式

Image(

image: AssetImage("images/1.jpg"),

width: 100.0,

height: 100.0,

),

//Asset 第二种方式

Image.asset("images/1.jpg",

width: 100.0,

height: 100.0,

),

//Network 第一种方式

Image(

image: NetworkImage("https://img.ivsky.com/img/tupian/t/201411/27/weixiao_de_ningmeng_3d_sheji.jpg"),