Understanding Android's webview addjavascriptinterface

Question

I know that to interact from Javascript to Java you have to inject a Java object using the addjavascriptInterface method in webview.

Here is the problem I am facing.

Answer 1

(copied from my response on a similar question)

I've taken Jason Shah's and Mr S's implementation as the building block for my fix and improved upon it greatly.

There's just far too much code to put into this comment I'll just link to it.

• Details: http://twigstechtips.blogspot.com/2013/09/android-webviewaddjavascriptinterface.html
• Source: https://github.com/twig/twigstechtips-snippets/blob/master/GingerbreadJSFixExample.java

Key points are:

• Applies to all versions of Gingerbread (2.3.x)
• Calls from JS to Android are now synchronous
• No longer have to map out interface methods manually
• Fixed possibility of string separators breaking code
• Much easier to change JS signature and interface names