[android-developers] How to Send Phone to Phone "Alerts" in Background?

Hello,

In my app I am giving the option for users to share information with
other users of my app. After two users decide to share, every time one
of the sharers updates the app I need an alert/notification sent to
the phone of the other user so that the app updates automatically with
the new information. So basically I am looking for something along the
lines of hidden text messages, which when received the app will
automatically update.

Can anyone point me in the direction of what to use? What Android has
to offer to accomplish this?

Thank you!

Matt.

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