Android Fung

Users usually don't expect they have to queue in an app. If queueing is a must, please use Notification to tell your how long they have to wait. So they can switch to other apps. Otherwise, should the user keep this page active?

On mobile devices, users expect they can finish the task within a few minutes. e.g. in the metro, or in a lift.  Don't block user from using the app if the update is not critical. 

Clipboard is NOT a secure. NEVER store information such as National ID, credit card PAN ... etc in the clipboard.