There are 3 easy ways for importing the image file in Drawable directory of Android Studio. One important thing to remember image file name should be start with text.
First:
In Project file find the directory "res" than "drawable".
Right click on "drawable" directory and from menu click on "Show in Explorer".
drawable folder will be open in windows' explorer. Copy paste the images here.
Go back to Android Studio, images will be available in "drawable".
Second:
Select the image from explorer and drag to drawable in Android Studio. (Note: this will move the actual file)
Android Studio will open a dialog for asking directory path. Click OK button.
Third:
In Android Studio go to the activity.xml design screen and from "Palette" drag drop the "ImageView" in "Component Tree. From "Attributes" window find "srcCompat" and click on option button. A window will open.
Click on "+" and choose "Import Drawables".
Select the image file from explorer and click OK.
In next window click Next button.
In next window click Import button.
Now from Pick a Resource window select the image and click on OK button.
