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This looks like a networking issue:

Unable to resolve host "Ubuntu-Test": No address associated with hostname

Your android app is trying to resolve the hostname Ubuntu-Test and it fails.

Have you looked at the ROS network setup wiki page?

In your case, I think you need to at least export ROS_MASTER_URI=http://IP_OF_YOUR_MASTER:11311/. You probably also need to export ROS_IP=IP_OF_YOUR_MASTER. All on your desktop machine.