Circular progress bar
<p>I am working on an application that needs a "circular progress bar" something like this (it doesn't need to have color changes or be empty in the middle, a simple thing would be enought for me, but if you'd like to tell me how to make color changes aswell i'll be happy to learn :) )</p>

<p><img src="http://i.stack.imgur.com/4WSAF.jpg" alt="enter image description here"></p>

<p>I want to use it to show the battery percentage in my app</p>
