title: How to handle callbacks in webview
body: <p>I am working on an android project right now and have a question about how to do callbacks in different webviews. I used JSInterface for my project too. Here I have 2 webviews. One has an index page, anther is a overlay(still a html page though.) What I want to do is if any user clicks on some links on the overlay, it should fire a callback function which is written in the java file where the index page was connected to through JSInterface. It might sound confusing, but I have draw something to help make it clear!</p>
  
  <p>Thanks!<img src="https://i.stack.imgur.com/H5Uws.png" alt="enter image description here"></p>