How to call a javascript function directly from an activity in Android?

Question

I wanted to know if there is any way that I can call a JavaScript function from native Android Activity.

I came across:

webView.loadUrl("javascript:hello()");

But it did not work for me.

Also, how will Android know in which html page does this JavaScript function reside?

Answer 1

In case anyone has any issues with this like I did, you need to call your javascript function after the page has finished loading otherwise the javascript won't be called:

    webviewer.loadUrl("file:///android_asset/mypage.html");
    webviewer.setWebViewClient(new WebViewClient() {

        public void onPageFinished(WebView view, String url)
        {
            webviewer.loadUrl("javascript:hello()");
        }
    });