Android is an extremely popular platform, with good software support.

NetBSD has some COMPAT_LINUX support, and it might be possible to leverage this to run Android applications.
This is only done for GNU/Linux platforms right now (SUSE / Debian).

We need to start with Android x86, as COMPAT_LINUX for x86 already exists and is known to work.

As this is a difficult project, the project will need adjustments with time.