Set Image as backgroundto lock screen and regular screen

Hello guys. I'm new in mobile development - so sorry if my question is stupid.
I want make a application which will can to change (set new Image) background for lock screen and regular screen (desktop background)

Questions are:
1) If I can do it? Because I read one topic and had seen that somebody wrote that music application(media services) can change background only/ If it right?
2) If I can - can you give me some code example or just link to right topic?

BTW I'm junior in mobile dev, but have hard prog. skills,

Thank you.


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