How to get value from javascript function loaded on webview in android

Question

I have to say that, i look up a lot but i couldn't find the answer although there are lots of answer. They did not work for me.

I have a javascript function called getCustomerID() in my website which is loaded to my webview. It just return an id value as integer.

How can i get this return value ?

Here is function loaded in webview :

<script type="text/javascript">
    function getCustomerID(){
        return 0;
    }
</script>

And i just want to get that "0".

Any help will be appreciated

You'd just run getCustomerID();, wouldn't you? Maybe set a variable to its return value like so: var x = getCustomerID();, right? Am I misunderstanding something? — Abraham Hamidi
– Abraham Hamidi, Commented Dec 25, 2014 at 12:42
Actually i want to get that return value into my android activity. @TheWobbuffet — alicanbatur
– alicanbatur, Commented Dec 25, 2014 at 12:45

Quark · Accepted Answer · 2014-12-25 12:58:57Z

2

<script type="text/javascript">
    function getCustomerID(){
        window.SJSI.sendValue(0);
        return 0;
    }
</script>

And implement:

...
webView.addJavascriptInterface(new SimpleJavaScriptInterface(), "SJSI");

final class SimpleJavaScriptInterface 
{
    @JavascriptInterface
    public void sendValue(final String value) 
    {
        myvalue = value;
        ...
    }
}

and don't forget:

WebSettings webSettings = webView.getSettings();
webSettings.setJavaScriptEnabled(true);

edited Dec 25, 2014 at 12:58

answered Dec 25, 2014 at 12:50

Quark

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4 Comments

alicanbatur Over a year ago

Thanks for response, but it does not work. @JanHvrda

Quark Over a year ago

It is weird. What is the behavior when you call the window.SJSI.sendValue(0) line - I mean javascript error or program enter the sendValue() method in Java, but value is not passed correctly or program even don't enter the sendValue() method...

alicanbatur Over a year ago

Should this error be about permissions or etc ? @JanHvrda

Quark Over a year ago

I'm not sure - may be try to add: webSettings.setDomStorageEnabled(true);

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