At some point in an Android project you will need to import some drawables - be it toolbar icons, images, UI features - in res/drawable directory. Most of the t
As Rob Meeuwisse mentioned in a comment above, you can do it in one copy and paste action. Rather than copy and paste each of the files one by one, you can instead select all four drawable-XXXX folders (not the images themselves!) in your OS file manager at the same time (by Ctrl-clicking in Windows/Linux or Command-clicking in OS X), copy all these folders and then paste them into the res folder in Android Studio.
The images will automatically be pasted into the appropriate drawable folder in res. This works because if Android Studio notices that you're copying and pasting a folder that already exists in the project, it will simply use the existing folder and paste in what's missing rather than replace/discard the files that are already there.