Note: The content of this post no longer represents current Android best-practice. Learn about the latest best practices for unique identifiers here. [The contents of this post grew out of an internal discussion featuring many of the usual suspects who’ve been authors in this space. — Tim Bray] In the Android group, from time to time we hear complaints from developers about problems they’re having
![Identifying App Installations](https://cdn-ak-scissors.b.st-hatena.com/image/square/332b221eea73c15485718e1a5f4dfe0621a77fe3/height=288;version=1;width=512/https%3A%2F%2Fdeveloper.android.com%2Fimages%2Fsocial%2Fandroid-developers.png)