Android 4: Give buttons another style/appearance
<p>I'd like to change the appearance of the default Android 4 buttons. They look like that: </p>

<p><img src="http://i.stack.imgur.com/hvE37.png" alt="enter image description here"></p>

<p>I'd like them to be completely black, a white border, no rounded corners, that's all. The blue hover effect is great, no change to that. Unfortunately, there are a lot of parameters that button has. Can I realize that with a single style.xml? Which are the interesting parameters?</p>

<p>Thank you very much.</p>
