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Editorial Team
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Asked: 2026-05-31T16:34:25+00:00

I’m trying to write a class that will return a string of HTML with

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I’m trying to write a class that will return a string of HTML with Javascript for use in a WebView. Returning HTML and Javascript works well, but I’m having issues loading libraries with the returned HTML. As an example, this works well:

public static String helloWorld() {
    String html;
    html =  "<!DOCTYPE html>" +
            "<html>" +
            "<head>" +
            "<title>" +
            "</title>" +
            "</head>" +
            "<body>" +
            "<script>" +
            "document.write(\"Hello, World\");" +
            "</script>" +
            "</body>" +
            "</html>";
    return html;
}

However, this does not:

public static String helloWorld() {
    String html;
    html =  "<!DOCTYPE html>" +
            "<html>" +
            "<head>" +
            "<title>" +
            "</title>" +
            "<script src=\"../assets/src/external_script.js\"></script>" +
            "</head>" +
            "<body>" +
            "<script>" +
            "external_script_function();" +
            "</script>" +
            "</body>" +
            "</html>";
    return html;
}

I’m guessing that the filepath for the external_script.js import is incorrect? Using WebView.LoadUrl(myLocalHtmlFile); works when using the other JS file. How would I go about making this work properly? Or alternatively, is there a better way to achieve similar results?

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1 Answer

  1. Editorial Team

    You need to feed the assets folder to the WebView as the base URL. Like this:

    MyWebView.loadDataWithBaseURL("file:///android_asset/", helloWorld());

    And then the <script> tag would go like this:

    <script src="src/external_script.js"></script>

    Assuming the library resides under assets/src. And yes, you need to enable JavaScript like triad is suggesting.

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