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# ContentProvider
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## 简介
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- `ContentProvider` 是Android的四大组件之一,其余的是`Activity`, `Service`, `Broadcast receiver`
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- 主要用来实现应用程序之间的(跨应用)数据共享,例如手机中联系人APP就使用了ContentProvider 读取和修改联系人的数据,但需要先获得相应权限。

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