Every where I look there is plenty of photography love for the Iphone. I, myself prefer Google Android and own a first generation Motorola Droid. I love the phone and now I love it more. I can now create lighting diagrams while out and about with a free app called Lighting Studio.
Jianzhong Li has written a useful little app that I just started using last night while lying in bed. Lighting Studio allowed me to quickly set up a lighting diagram and save it as a png file. Other options were to share my diagram on my social networks or to send via SMS messaging.
While not every piece of equipment you own may be in the selection menu, there is a good cross section and one can find something comparable for use. I have a feeling that I will be using this app for a good long while, and I am hoping that it will work well with droid tablets.