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Hi,
I actually have solved the problem by now. I think the solution was mentioned somewhere in ROSAnswer already so I would not take credit for it.
The solution is to set ROS_IP in the host PC to its IP address so that it can communicate.
This step is simple but can be easily overlooked. As I got the rosjava pub_sub tutorial to work, I ignored setting ROS_IP because I think I do not need to do so. However, a colleague aptly reminded me that the pub_sub tutorial only tested one way connection from the Android tablet to PC but not the other way round. For the other way to work (e.g sending images from host PC to the android device), you will need to set ROS_IP.
In order to set ROS_IP: $export ROS_IP=ip_adress
To check whether IP has been set: $echo $ROS_IP You should see your computer IP address.
Hopefully this will help someone else with the same problem as well.
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