I connected two smartphone cameras(Android) using android_camera_tutorial

I connected two smartphone cameras using android_camera_tutorial and I expect received two topic but it just received only one topic please give me a answer that how to solve this problem. I think that modifying java file, including android_10 (API10), may be MasterChooser.java, RosActivity.java, NodeMainExecutorService.java. I use Ubuntu14.04, ROS indigo