Mine does close to the same thing on my android phone (Samsung S4, running CM12, android L), and android tablet (nvidia shield tablet running android L). In both cases I can see the meter, but when i connect the readings are all blank until it connects for an instant then it disconnects.
Like Phil noted, if an iphone connects once, then all android devices seem to be happy until a reset or sometimes if I disconnect the meter gets in a bad state and can’t be seen by anything. In that case I reset the meter and the iphone has to connect once to let any of my android devices connect.
I should note I’m running the latest apk you linked to in this post.