I don’t work for the manufacture, but anyone looking at getting a dash cam should definitely check this out first… (some others available, but this has the best reviews)
AutoGuard Blackbox - Dash Cam
Its a free app from the google play store, that is very feature rich. And for a small fee it comes with even more features.
I had a little play with it and was very impressed, but as I dont really see much traffic in my current role I switched it off. Might suite someone else’s needs better. Could be handy if someone tries to pull an insurance scam on you. Or a cause of accident is disputed.
It records video on an endless loop (length fully customisable) until you press the save button. It works with the many sensors in phones nowadays, so it can also record gps info (location, speed, time). It can auto detect an accident via the g-sensor. Auto upload videos of interest to a youtube account, and even call the emergency services for you.
It can work as a background task, so you can still make calls and use navigation apps.