9-patch drawable behaving badly, weird artefacts - what is wrong here?

Question

so Im trying out the 9-patch images. I started out with a PNG-file where I have a semi-transparent square with rounded corners:

Answer 1

Try to do 9-patch markings from all 4 sides. Also make sure you have .9.png file extension (f.i. your_cool_pic.9.png)

Here is my example

Answer 2

Make it small as possible. 9-patch cant shrink they can stretch. Fill right and bottom border with black color. Edit 9-patch borders with draw9patch tool to prevent errors. Your 9-patch should look similar to this one.

Answer 3

The 1 pixel border must be either completely black (nine patch markers) or completely transparent. Basically, edit the image to cut out anything in the 1 pixel border except for the two black dots.

Also, your image can be much, much smaller in size. The point of a nine patch is that the markers on the top and left sides mark what is to be stretched. Most of that content with straight edges could be removed.