title: How to send notification to user at particular time set in android app
body: <p>I have created android app. Inside app, user can set time for notification so that at that time if user will not performed particular action then application should send notification to him automatically. I am new in android Please suggest me what i have to do (either create a backend services which will check either user set time reached then send notification to him or somelese solution). Please help</p>