本文介绍了Android应用程序如何在操作系统层面实现安全隔离，每个应用都运行在独立的Linux进程中，并拥有唯一的用户ID。此外，还详细列举了Android应用的四大组成部分：活动(Activity)、服务(Service)、内容提供者(Content Provider)及广播接收器(Broadcast Receiver)。
Each Android application lives in its own security sandbox:
1 the operating system is a muti-user Linux system.
2 the system assign each application a unique Linux user ID.
3 each process has its own virtual machine (VM).
4 every application runs in its own Linux process.
Application Components
1 Activities
2 Services
3 Content providers
4 Broadcast receivers
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