Metronome that works with Spotify?

Hi:
Does anyone know of a free metronome app for Android that will play simultaneously with Spotify?
All the ones I've tried kill the Spotify audio when turned on, and are silenced when play resumes in Spotify.
I've seen one for iOS, but can't find one for Android.
I know there are apps/tools to automatically determine BPM, (or let you tap the tempo), but that's not what I'm looking for.
Thanks in advance for any info.