Developing two android app that can send/trigger notification to each other <p>I've been studying android development for about 2 months, and still trying to learn new things and stuffs in mobile dev. And I've been wondering how can two android application send notification to each other. I saw a tutorial about <code>notificationCompat</code> wherein a notification pop-up when an action(<code>onClick</code>) is performed inside the application. And I thought that maybe it is also possible to trigger that notification from another application. And my question is now, How can I trigger a notification in the 1st application using the 2nd application? And also addtional info will be that the two application is on the same local network(Ad hoc).</p>