Android webview javascript Interface not working properly

Question

Really do not have any ideal why this doesn't work. Basically, I am trying to do this.

 public void testJS() {
        final WebView webView = (WebView) findViewById(web);
//        webView.getSettings().setDomStorageEnabled(true);
        webView.getSettings().setJavaScriptEnabled(true);
        webView.addJavascriptInterface(new JSInterface(webView), "sample");
        webView.setWebChromeClient(new WebChromeClient() {
            @Override
            public boolean onJsAlert(WebView view, String url, String message, JsResult result) {
        /* Do whatever you need here */
                Log.e("chrome", "asdf");
                return super.onJsAlert(view, url, message, result);
            }


        });
        webView.loadUrl("javascript:window.sample.doEchoTest();void(0);");
    }

and this is the JSInterface

   public class JSInterface {
        WebView mAppView;

        public JSInterface(WebView appView) {
            this.mAppView = appView;
        }

        public void doEchoTest() {
            Log.e("sample", "test details");
            Toast toast = Toast.makeText(mAppView.getContext(), "sample test details", Toast.LENGTH_SHORT);
            toast.show();
        }
    }

the javascript code never runs.

basic functions like alert works :

webView.loadUrl("javascript:alert('sample')");

why is webView.loadUrl("javascript:window.sample.doEchoTest();void(0);"); not working ?

EE Chris · Accepted Answer · 2017-06-20 16:10:06Z

1

Just browsing for a different answer, a guess at this would be that you haven't exposed it to be accessible from JS. You need to do so explicitly for each method as so:

@JavascriptInterface
public void doEchoTest() {
            Log.e("sample", "test details");
            Toast toast = Toast.makeText(mAppView.getContext(), "sample test details", Toast.LENGTH_SHORT);
            toast.show();
        }

answered Jun 20, 2017 at 16:10

EE Chris

111 bronze badge

Sign up to request clarification or add additional context in comments.

1 Comment

Claudia Over a year ago

Welcome to Stack Overflow! Please feel free to take a tour of the site, and if you need additional help with the site, check this out. Oh, and if you ever run into issues that the help page doesn't cover, feel free to ask on meta.

Collectives™ on Stack Overflow

Android webview javascript Interface not working properly

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related