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App Inventor 2 图表组件实战：5种图表类型+动态数据绑定，手把手做出专业...
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基础概念
App Inventor 2 的图表体系由三个组件构成：
1. Chart（图表容器）：负责画布渲染，决定图表类型（折线图、面积图、散点图、条形图、饼图）
2. ChartData2D（二维数据序列）：挂载在Chart上，负责存储和管理x-y数据对...
App Inventor 2 文件操作教程 - 创建/读取/写入/管理文件 · App Inventor 2 中文网
... 存储到相册（通知系统刷新）
常见问题
Q1: 保存文件时提示权限拒绝？
Q2: 如何判断文件是否存在？
Q3: 如何处理大文件？
Q4: FileTools扩展保存到相册需要重启？
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