How can I create a 9-patch that can preserve circle of this image?

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http://stackoverflow.com – I have this image http://i.stack.imgur.com/i8Iab.png I want to preserve the circle at the bottom of the image so I make this 9-patch http://i.stack.imgur.com/UNWdE.png but somehow in the mobile the circle becomes ellipse like this i don't know why the bottom part get stretch. Any help please, Thanks. (HowTos)