Help with building a smartphone app for a sensor platform

[aerosol]

I am looking for some examples on how to build a simple phone app for my sensor platform. I am still working on my sensor platform, so I am not sure what do I need to do with my platform design so that I can read the data/control the sensor platform using a smartphone app?

[AWI]

A smartphone could be useful as a sensor, multiple sensors or output device. Like the 1sheeld project. Otherwise I would think the smartphone app can better interact with a controller. (imperihome/ vera)