Controlling Arduino yun using android application and WIFI. need help tnx :)

Hi. newbie here. I'm creating a security system using arduino yun and I want to create an android application that I can turn on and off the PIR sensor just using wifi. I already search for tutorials until I found this tutorial: Towards Tanduk Ion Project: Arduino Yun + Android.
but my problem is the application needs to set the IP address of arduino. so my question is : Is there a possible way that I can control my yun using android phone without setting the IP address? thanks in advance :slight_smile: