Note/大学笔记/安卓/第七章:检测数据变化.md
2024-01-12 16:35:29 +08:00

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## 第七章:检测数据变化
1.创建项目A
2.创建数据库和表
3.创建内容提供者 暴露数据
4.MainActivity 操作数据
1布局文件中添加四个按钮