We ran into a problem when leaving the activity. WebView will display the following message in logcat:
EventHub.removeMessages(int what = 107) is not supported before WebViewCore is set up
To prevent this message from showing up use WebView stopLoading() method:
  // !!! This method is wrong!
  // !!! Do not solve problem
  @Override
  public void onStop() {
     try{
         webView.stopLoading();
     }catch(Exception e){
         e.printStackTrace();
     }
  }