To find the WiFi IP address on the android dev phone, you can:
1. From the phone
Follow Settings >> Wireless Controls >> Wi-Fi settings and tap on the network you are connected to. It'll pop up a dialog with network status, speed, signal strength, security type and IP address.
2. Using adb (from command-line)
Assuming you have the android SDK installed on your computer, do:
$ adb shell ifconfig tiwlan0
tiwlan0 is the name of the wi-fi network interface on the device.
The command will show the IP address, netmask and other interface parameters like up/down state, broadcast or not, and so on.