Hi as per android documentation the drawable folder needs to have multiple sub-directories for images of different dpis. However in Android Studio creating any sub directory
There are two ways of doing it.
1.Right click on drawable New->Image Asset-> select your highest resolution image rest will be created automatically. once you finish you can see different resolution inside drawable folder
Now yourprojectname->app->src->main->res->
Aila You can see your drawable folders with hdpi mdpi etc.