How to get Android application id?

Question

In Android, how do I get the application\'s id programatically (or by some other method), and how can I communicate with other applications using that id?

Answer 1

The PackageInfo.sharedUserId field will show the user Id assigned in the manifest.

If you want two applications to have the same userId, so they can see each other's data and run in the same process, then assign them the same userId in the manifest:

android:sharedUserId="string"

The two packages with the same sharedUserId need to have the same signature too.

I would also recommend reading here for a nudge in the right direction.