Hi,

I want to create a very small app/shell script to automatically pick a random wallpaper from a given folder and set it as lockscreen wallpaper every X minutes. (Yes I know it may consume battery a bit) It has to be transparent, so when user double-taps on screen he'll see a different wallpaper if the timer reached X.

Problem is, I don't know how to change lockscreen wallpaper from outside? Is there an API call or one-liner code to change wallpaper, where should I take a look at? It'd be great if someone supplied with me the exact call/code