Sure - I've produced a display program for a PIC project that is basically collecting sensor data and sending it by BlueTooth. The Android app reads and displays the data, and saves me carrying a laptop for a task a phone can happily do. I have not hit any real limitations with the language other than my imagination. I did uncover a bug and got a load with a fix within a few hours, which is way better than I'd see with a proprietary product.

All the major constructs are there, and all the smart phone platform advantages are accessible like BlueTooth, WIFI, position/motion sensors, GPS, file reads and writes, etc. as well as graphics tools and text dislay tools, and there are tools to produce standalone apps for distribution in Google Play. I guess my only concern is the double edged sword of open source and GPL - you get lots of code to reuse, but you must publish your source so you might lose any competitive advantage. Perfect for a hobbyist, and still usable commercially with caution.

Not a lot of posts, though, so I'm guessing not a lot of PBP folks are using it - or maybe not even doing Android.