title: evaluateJavascript only wok in main thread?
body: <p>I tried to use evaluateJavascript method in my main thread and it works fine. But if I move the function to my other thread (I have a service running in backgroud waiting for message). It does not work at all. So I am assuming evaluateJavascript only works in main thread, which is UI thread. Is this the fact or I am doing anything wrong?</p>
  
  <pre><code>`myWebView.evaluateJavascript("test()", null);`
  </code></pre>
  
  <p><code>test()</code> is the method in HTML application</p>
  
  <p>Is there any way to call evaluateJavascript in other thread?</p>