title: How to remind people to use your Android app if they haven't opened it for quite some time?
body: <p>Basically I'm developing a social networking app and wanted to know, how I could give possible notifications to the users who have downloaded my app to open the app and use it. It could be on some time period too. But I want to know even when my app isn't running in the background, then how can I give notification to the user to open it and use it? </p>