Round corners in a progress bar Android

I'm following that tip for change the color of a progress bar. The problem is that using that snipplet the corners of the progressbar turns squared. How can I keep the original corner开发者_开发知识库s look and change the colors? Thanks in advance

Try to assign each corner separately and put pixels instead of DIP, some manufacturers don't implement this feature correctly:

android:topLeftRadius="5px"
android:topRightRadius="5px"
android:bottomLeftRadius="5px"
android:bottomRightRadius="5px"