Read contact list because it is not only used in a share, I fork this feature.
Read permissions contact list has not been needed since JUST PLAYER.
Please try JUST PLAYER v3.19
But sharing GCM is very interesting features.
Please see that we have created a video demo
In short, I can play the music on another device in synchronization with the playback.
Do you not use the jukebox? For example, NexusQ or SonyTablet.
Might be surprised with a friend's device to transfer your voice!
Please Try it!