title: Android: How to send push notification to other users with the same app?
body: <p>Recently, I'm trying to make a app that will send a simple notification to the user with a certain ID with the same app. However, since I'm new to these types of development, I want to know if I should use a GCM or if there are some better options. I've searched over google but couldn't get a good solution to it. If possible I would want some tips.</p>