I explained in my comment here on how I achieved something very similar for free in my android app: https://news.ycombinator.com/item?id=28176237 https://news.

I explained in my comment here on how I achieved something very similar for free in my android app: https://news.ycombinator.com/item?id=28176237 https://news.ycombinator.com/item?id=28176237