how to use javascript value in java code in webview?

Question

if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) {

        webView.evaluateJavascript("alert('hi'); var elem = 
        document.querySelector('.price__container__discount__sales_price').firstChild.innerHTML;" 
        ,null);

        btn.setText(elem);
}

i want use elem variable that declare in js into java code in setText methode

tomerpacific · Accepted Answer · 2020-09-15 08:19:17Z

1

If you want to get a value from your javascript code loaded into your webview, I would expose a method with the @JavascriptInterface annotation that would gather that value from your javascript.

An example of how to do that is below:

NATIVE

//Make sure to enable these settings
  webviewSettings.setJavaScriptEnabled(true);
  addJavascriptInterface(YOUR_INTERFACE_CLASS, YOUR_INTERFACE_NAME);

 @JavascriptInterface
    public void getSalesPrice(String value) {
        //Here you will get the value from your javascript
    }

JAVASCRIPT

function sendDataToNative(data) {
        YOUR_INTERFACE_NAME.getSalesPrice(data);
    }

answered Sep 15, 2020 at 8:19

tomerpacific

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