[Feature request] Set Themes Change

[Anonyzh]

Whenever I open the app, itstheme is always the same.This may have some impact on the different times the app is opened.I am thinking about changing it.
For example, if the app is opened in the daytime with a grey background and opened in the evening with a black background, it may have a better experience.
I am also trying to do a simple aspect, to solve this solution

Oh! I see problem #142, or is this a crude implementation of the problem that doesn't require additional support?

[Anonyzh]

I don't think it's too hard, I already have a simple implementation