title: How to clear WebView content?
body: <p>I have a <code>WebView</code> in my app with <code>wrap_content</code> width and height</p>
  
  <p>Before I use <code>webview.loadData</code>, the width and height of the it was 0, after I load a page (or I use <code>webview.loadData</code>) , it'll display a web page.</p>
  
  <p>My question is , how can I clear the webview to recover it back to the original state,  just as  before it <code>loadData</code>?</p>