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To expose java methods to javascript, I used
mWebview.addJavascriptInterface(new JSInterface(this),"Android");
When I am actually in the JSInterface, how would I get the webview the JavascriptInterface was added to?
I assume you are still dealing with the 2 webviews described here:
How to handle callbacks in webview
You cannot determine what webview the JavaScript interface is attached to. Not without doing some preparation upfront. Some options are:
Use a different interface name for each webview and then test which one is present to determine which webview you are in.
Use the same interface, but have each function in the interface include a parameter called caller which has the number of the calling webview.