stringByEvaluatingJavascriptFromString（iOS方法，相当于Android？）

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!