The logic about onDraw of ImageView
<p>The class MyImageView extended ImageView, In method onDraw(), I have following code:</p>

<pre><code>@Override
protected void onDraw(Canvas canvas) {
    this.setImageBitmap(someBitmap);
    super.onDraw(canvas);
}
</code></pre>

<p>Although the code works, I am wonder why onDraw has not benn called infinitely, since setImageBitmap will call onDraw -->right or not? I am still want to know is there performance issue for above code?</p>
