"This theme no longer works on this phone. Delete this theme?" - Error message when trying to apply

[fischer-felix]

I have a problem on my LG V30, where if I try to apply the theme from settings, it tells me this error message.
The V30 is only running android 9, and I noticed the api requirements were set to 29(=10), so I changed those, but I would expect it to still work, as the actual UI version did not change (UX9).

[audietron171]

Have you tried changing the "com.lge.theme.profile_version" value to "8" (in app>src>main androidmanifest.xml)? I think this might fix it.

[fischer-felix]

Fixed it, thank you!

Unrelated, but I might as well: this is normal because there is no actual app (as in gui interface) in there, right?

[fischer-felix]

I'm also having some trouble adding overlays, so from what I have understood so far, this

should change some properties in the clock app, but I cannot see any of it applied.

[audietron171]

A couple of suggestions:

• Delete the "public.xml" file, will be generated automatically and having an old one here can cause issues.
• Did you change the SDK level for each overlay?
• For the drawables, make sure that there isn't different resolutions for those resources. If there is, those might not be used. For example, "xxxhdpi" resources are generally used for 1440p devices (unless other sizes are available). Try adding in resources for these too if needed. This shouldn't matter for "value" xml's but might be worth removing the "xxxhdpi" name on the folder though.
• To see if your overlay is actually applying, try changing something obvious. Colors are usually a safe bet (can find them pretty easy using a color picker). Be aware that the launcher icon for Clock is set by Home however (so if trying the Icon color, view it in Settings or in Recents).

[fischer-felix]

I'm having some difficulty getting things to work, do you know of any theme that would be open source, so I could just go ahead and replace things to get it to my liking?

[audietron171]

I don't know of any that are source only, but the best option for you would be to decompile the default White theme and use those resources (and compare manifest files etc). Have you tried that yet?