How to call javascript from Android?

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There is a hack:

  1. Bind some Java object so that it can be called from Javascript with WebView:

    addJavascriptInterface(javaObjectCallback, "JavaCallback")

  2. Force execute javascript within an existing page by

    WebView.loadUrl("javascript: var result = window.YourJSLibrary.callSomeFunction();
    window.JavaCallback.returnResult(result)");

(in this case your java class JavaObjectCallback should have a method returnResult(..))

Note: this is a security risk – any JS code in this web page could access/call your binded Java object. Best to pass some one-time cookies to loadUrl() and pass them back your Java object to check that it’s your code making the call.

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