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Editorial Team
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Asked: 2026-05-25T20:27:42+00:00

How do we call javascript from Android? I have this javascript library which I

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How do we call javascript from Android? I have this javascript library which I would like to use, I want to call the javascript function and pass the result value to the android java code. Haven’t found the answer from now. i managed to call android code from javascript, but I want the other way around.

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  1. Editorial Team

    There is a hack:

    1. Bind some Java object so that it can be called from Javascript with WebView:

      addJavascriptInterface(javaObjectCallback, "JavaCallback")

    2. Force execute javascript within an existing page by

      WebView.loadUrl("javascript: var result = window.YourJSLibrary.callSomeFunction();
    window.JavaCallback.returnResult(result)");

    (in this case your java class JavaObjectCallback should have a method returnResult(..))

    Note: this is a security risk – any JS code in this web page could access/call your binded Java object. Best to pass some one-time cookies to loadUrl() and pass them back your Java object to check that it’s your code making the call.

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