Ask HN: Are single use handheld devices dead?

I currently write software for old school handhelds (think Palms and HPs) used for data collection. Our application puts the device in kiosk mode, and the user cannot exit our software. Unfortunately, the available options for new devices is dwindling (Palms went EOL a few years ago, and the HPs will likely follow suit shortly). The current generation of smartphones is intriguing, but it seems that no one is accommodating single-use devices these days. Are we missing a player in this market? Android seems promising, since it is open source--does anyone have experience writing kiosk apps to run on Android devices?