stringByEvaluatingJavascriptFromString (iOS method, what is Android equivalent?)

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Yeah, I miss this method greatly in Android 😉

To execute JavaScript and get response you can do as follows:

  1. Define JavaScript callback interface in your code:

    class MyJavaScriptInterface {
    @JavascriptInterface
    public void someCallback(String jsResult) {
         // your code...
    }
}

  2. Attach this callback to your WebView

    MyJavaScriptInterface javaInterface = new MyJavaScriptInterface();
yourWebView.addJavascriptInterface(javaInterface, "HTMLOUT");

  3. Run your JavaScript calling window.HTMLOUT.someCallback from the script:

    yourWebView.loadUrl("javascript:( function () { var resultSrc = document.getElementById(\"image\").getAttribute(\"src\"); window.HTMLOUT.someCallback(resultSrc); } ) ()");

Hope this helps!

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