Use JavaScript to detect connectivity changes and inform the user if the app is currently operating in offline mode. javascript
If your website is static, you can include all the necessary files (HTML, CSS, JS, images) in your Android project's assets folder. The WebView can then load a local file using the file:///android_asset/ scheme. For dynamic sites, you might need to programmatically download and save content to the device's internal storage on the first launch or at regular intervals. wrapper offline android