title: Android FCM notification grouping
body: <p>I was trying to implement FCM notification for a chat app and I want to achieve "WhatsApp-like" notification where the notification will be grouped by conversation.</p>
  
  <p>Say when Alice replied to a conversation with Bob inside, Bob will receive a notification with the body "Alice: <em>the content</em>". But if Alice quickly reply to the conversation again, Bob will get another new notification but I just want to append the new reply onto the prev notification instead. </p>
  
  <p>How can I achieve that?</p>