Android surfaceview animation
<p>I'm trying to achieve animation on a surfaceview. But, my surfaceview's background is transparent, and I can't clear away the pixels of last frame. 
Can I achieve some animations on transparent surfaceview? Maybe I only use 'Animation' class on a view. 
Thanks!</p>

<hr>

<p>Maybe I didn't describe the question clearly. I want to achieve a animation, but surfaceview can't refresh last graph.It looks like the picature.</p>

<p><img src="http://i.stack.imgur.com/9suhx.png" alt="enter image description here"></p>

<p>The background is transparent. I known draw canvas with color can clean the last drawn graph. But its background is transparent, the method doesn't achieve refresh.
Please help me. Thanks! </p>
