Any easy way to replace app icons?

I was wondering why my custom app icons were not showing up even after copying them to the app/icon folder . After a bit of research I found that the default Rho icons remained in app\resources\android\res sub-folders. Just replaced the defaults in drawable and mipmap subfolders within the res folder and then re-built my app. Now, the new custom icons are showing up in the app. 

However, there are many more subfolders under app\resources\android\res. Do I have to replace the icons in each of these subfolders, in addition to drawable and mipmap subfolders? Or is there an easier way?

TIA