IssueTracker

So in my app I have a dialog in which the user has to choose a country (there is a ListView with the flags and names). For the flags up until now I used PNGs https://imgur.com/xwFTUpU . The variables of the class that is used to provide the information for the ListView look like this https://imgur.com/VI3rMAa and this is a picture of the objects being created https://imgur.com/B2hhvrT .

Now I am trying to get rid of the PNG files and replace them with vectors, but I am not having much success. So for example if I start by replacing the ad.png file (Andorra flag) with a vector image with the same name (ad.xml) so my drawable folder now looks like this https://imgur.com/kxjVwdm this happens where the code for the objects is written https://imgur.com/7oYFcTi . The flag icon the left side disappears, the ad in R.drawable.ad does not get red because clearly the ad.xml file is in my drawables folder, however when I hover over it I get the file's path in red (as you can see in the picture)

So what happens when I start the app? Well a few things have happened. First there were a few times where a launched the app with no problems, also launched the dialog with no problems and the image was showing up correctly. There were also times when the app wouldn't even launch. There were also times where the app would start but when I try to open the dialog it would crash with this error: Resources$NotFoundException #0x7f07005e. The third one seems to be the most common.

So I when got that error I went online and searched for solutions and tried some solutions which did not work (obviously) like: cleaning the project, rebuilding the project, invalidating caches and restarting android studio, adding some lines to my gradle file (I don't remember exactly what it was). Basically I've tried every possible solution I could find on the internet and nothing has worked.

Any suggestions would be appreciated and also if you need any additional information I would be more than happy to provide it. Thanks for reading!

- NOTE: From what I know vector drawables are supported from API level 21 and my app's minimum API level is 21. So I don't think it is a compatibility issue.