Android官方文档中ANDROID_ID及相关表述里的“user”具体含义是什么？

Great question—this is a common point of confusion, so let's break it down clearly.

The "user" referenced in the ANDROID_ID documentation refers to system-level user accounts and managed profiles on the Android device, which are fully isolated environments with their own app data, settings, and access controls. Here's a more detailed breakdown:

• Primary & Secondary User Accounts: Many Android devices (especially tablets, but some phones too) support multiple independent user profiles. For example, you might have a main account for yourself, plus a separate account for a family member. Each of these counts as a distinct "user" in the ANDROID_ID context.
• Managed Work Profiles: If your device uses a work profile (set up for corporate apps and data), this is also treated as a separate "user" entity. Even though it's linked to your primary account, the work profile is a sandboxed environment, so apps running here will get a unique ANDROID_ID compared to the same app running in your personal space.

To put it in practice: If you install the same app (signed with the same key) on the same physical device, but run it in your primary user account, your child's secondary account, and your work profile—you'll get three different ANDROID_ID values. This aligns with the system's focus on data isolation between these environments.

内容的提问来源于stack exchange，提问作者A. Gurey