Search code examples
javascriptandroidandroid-webviewlocal-storage

Android - save value on LocalStorage before WebView.loadUrl()

Before I load a URL on WebView i want to set a value inside browser LocalStorage.

Till now the only way I did managed to set this value is after the page is loaded. This is how I can set the value:

browser.setWebViewClient(new WebViewClient() {

        @Override
        public void onPageFinished(WebView view, String url) {
                loadUrl("javascript: LocalStorage.set('namespace', 'key', 'value');");
        }
}

I did try to override the method onPageStarted(), but the value is not stored.

How can I set this key/value before the call browser.loadUrl()? The url/page depends on this value, so I need to set the value before I load the page.

Solution

  • What you can do is set a redirect into the javascript to the actual url and load the javascript plus redirect using webview.loadData().

     String injection = "<html><head><script type='javascript'>LocalStorage.set('namespace', 'key', 'value');window.location.replace('YOUR_URL_HERE');</script></head><body></body></html>";
 webview.loadData(injection, "text/html", null);

    Be aware though that you might need to save that to a file first before it works: see How to load a javascript redirect into android webview?