define a custom rotatable control
<p>I check reference it said the rotate control is through the attribute to rotate.</p>

<p>Now I want to use <code>OrientationEventListener</code> to change the orientation of control dynamically. I Used <code>findViewById</code> to get control, and the used <code>setOrientation</code> to change control orientation dynamically in <code>onOrientationChanged</code> method. </p>

<p>I try to use <code>canvas.rotate</code> in <code>ondraw</code> method. </p>

<p>Then I write a <code>setOrientation</code> and call <code>ondraw</code>. But refresh time and the effect are not good. </p>

<p>How to define a custom dynamic rotatable control?</p>
