I've created a nine-patch image using the Simple Nine-Patch Generator. This creates a directory with a res-folder, containing folders for each pixel-density-version of the image.
In Eclipse with ADT one could simply drag & drop these folders in the res-folder of your project.
This would seem like a no-brainer, but how do I add these generated nine-patch images to Android Studio? I'm using Android Studio 1.0.1.
If your problem is that you cant find were the drawables are you could eaisly select pakages from the top left side in the project structure there you can find the res folder and you could eailsy paste the 9 path in the corresponding folders
来源：https://stackoverflow.com/questions/27501334/add-9-patch-image-to-android-studio