目 录

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目 录

01 App Inventor 2 介绍 ..................................................................................................... 1

1.1 App Inventor 2 的发展与沿革 .................................................................................... 2

1.2 App Inventor 2 的整体架构 ........................................................................................ 2

1.3 构建App Inventor 2 的开发环境 ............................................................................... 4

1.3.1 申请Gmail 账号 ............................................................................................................ 4

1.3.2 安装App Inventor 2 组件 .............................................................................................. 6

1.3.3 安装MIT AI2 Companion App...................................................................................... 7

1.4 App Inventor 2 项目操作接口 .................................................................................... 9

1.4.1 App Inventor 2 项目管理接口 ..................................................................................... 10

1.4.2 App Inventor 2 项目设计接口 ..................................................................................... 11

1.4.3 App Inventor 2 项目拼块界面 ..................................................................................... 13

1.4.4 在仿真器中执行 .......................................................................................................... 14

1.5 项目维护 ................................................................................................................... 15

1.5.1 储存项目 ...................................................................................................................... 16

1.5.2 另存项目 ...................................................................................................................... 16

1.5.3 下载.apk 文件 .............................................................................................................. 17

02 认识常用组件与运算原则 ........................................................................................ 18

2.1 常用基本组件 ........................................................................................................... 19

2.2 拼块功能与事件 ....................................................................................................... 23

2.3 基本运算原则 ........................................................................................................... 26

2.3.1 常量 .............................................................................................................................. 26

App Inventor 2 Android 应用开发实战

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2.3.2 变量 .............................................................................................................................. 27

2.3.3 算术运算 ...................................................................................................................... 27

2.3.4 字符串运算 .................................................................................................................. 28

2.3.5 范例练习——求面积 .................................................................................................. 29

2.3.6 关系（比较）运算 ...................................................................................................... 30

2.3.7 逻辑运算 ...................................................................................................................... 31

2.3.8 范例练习——求面积（改良版） ............................................................................... 32

03 循环与列表 ..................................................................................................................... 34

3.1 条件判断 ................................................................................................................... 35

3.1.1 单向 .............................................................................................................................. 35

3.1.2 双向 .............................................................................................................................. 36

3.1.3 嵌套 .............................................................................