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Somehow network setup with ROS Android seems to confuse many users.

We'll need some more information:

Real Android device, or simulator
Version of ROS, ROS Android & Android itself
Network setup (LAN, WAN, etc)

Also, just to be clear: are you trying to subscribe on your Android device to topics published by your PC, or is the PC trying to subscribe to topics published by your Android device?

Somehow network setup with ROS Android seems to confuse many users.

We'll need some more information:

Real Android device, or simulator
Version of ROS, ROS Android & Android itself
Network setup (LAN, WAN, etc)

Also, just to be clear: are you trying to subscribe on your Android device to topics published by your PC, or is the PC trying to subscribe to topics published by your Android device?

Edit: assumptions:

you're using a physical Android device - not the simulator
and both your ROS pc and the Android device are on the same network (a simple home LAN)
you have checked that the Android device and the ROS pc have working IP connectivity
you checked the Android application and that it is able to connect to ROS masters other than its own

Make sure your ROS pc has ROS_IP set to its own IP, and that ROS_MASTER_URI=http://$ROS_IP:11311/. In most cases, a home LAN doesn't have proper DNS for the pc and/or the Android device, resulting in strange behaviour. Setting ROS_IP should work around that.

On the Android device, make sure to use the ROS_MASTER_URI with the IP address of the master (pc), not its hostname.

Once the Android node should be connected, use roswtf, rosnode and rostopic to diagnose your graph.