@Override
    public void openUri(Activity activity, Uri uri) {
        Intent intent = new Intent(activity, WebviewActivity.class);
        intent.putExtra(WebviewActivity.EXTRA_URL, uri.toString());
        activity.startActivity(intent);
    }
A Fallback that opens a Webview when Custom Tabs is not available
demos/src/main/java/org/chromium/customtabsdemos/WebviewFallback.java