WebViewAssetLoader

public final class WebViewAssetLoader

final WebViewAssetLoader assetLoader = new WebViewAssetLoader.Builder()
         .addPathHandler("/assets/", new AssetsPathHandler(this))
         .build();

      

webView.setWebViewClient(new WebViewClientCompat() {
    @Override
    public WebResourceResponse shouldInterceptRequest(WebView view, WebResourceRequest request) {
        return assetLoader.shouldInterceptRequest(request.getUrl());
    }

      
@Override
    @SuppressWarnings("deprecation") // for API < 21
    public WebResourceResponse shouldInterceptRequest(WebView view, String url) {
        return assetLoader.shouldInterceptRequest(Uri.parse(url));
    }
});

      

WebSettings webViewSettings = webView.getSettings();
// Setting this off for security. Off by default for SDK versions >= 16.
webViewSettings.setAllowFileAccessFromFileURLs(false);
// Off by default, deprecated for SDK versions >= 30.
webViewSettings.setAllowUniversalAccessFromFileURLs(false);
// Keeping these off is less critical but still a good idea, especially if your app is not
// using file:// or content:// URLs.
webViewSettings.setAllowFileAccess(false);
webViewSettings.setAllowContentAccess(false);

      

// Assets are hosted under http(s)://appassets.androidplatform.net/assets/... .
// If the application's assets are in the "main/assets" folder this will read the file
// from "main/assets/www/index.html" and load it as if it were hosted on:
// https://appassets.androidplatform.net/assets/www/index.html
webview.loadUrl("https://appassets.androidplatform.net/assets/www/index.html");