stringByEvaluatingJavascriptFromString (iOS method, what is Android equivalent?)

Question

In an iOS app, I used

stringFromJavaScript = [webView stringByEvaluatingJavascriptFromString:@"document.getElementById(\"image\").getAttribute(\"src")"];

To get the src directory of the image that was being displayed on the webView. I want to do the same for Android. What are my options?

Basically the intent is to capture the path so that I can email this same picture...

ie.

"picture.php?image=%@",stringFromJavascript

This way, that same image would be loaded when the user clicks the link, or posts it to facebook etc.

Answer 1

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!