public class MainActivity 
   extends AppCompatActivity implements AdvancedWebView.Listener {
     private static final String QT_TAG = "QT_TAG";
     private AdvancedWebView mWebView;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mWebView = (AdvancedWebView) findViewById(R.id.webview);
        mWebView.setListener(this, this);
        String url = "https://resident.uidai.gov.in/offline-kyc";
        mWebView.loadUrl(url);
    }

    @Override
    public void onDownloadRequested(String url, String suggestedFilename, String mimeType,
                                    long contentLength, String contentDisposition, String userAgent) {
        Log.i(QT_TAG, "downloadlistener0: "
                + userAgent +" " + mimeType+" " +  contentLength + " "
                + contentDisposition+ " " + url +"  "+suggestedFilename);

        DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));

        request.setMimeType(mimeType);
        request.setDestinationUri(Uri.fromFile(new File( Environment.DIRECTORY_DOWNLOADS)));
        //------------------------COOKIE!!------------------------
        String cookies = CookieManager.getInstance().getCookie(url);
        request.addRequestHeader("cookie", cookies);
        //------------------------COOKIE!!------------------------
        request.addRequestHeader("User-Agent", userAgent);
        request.setDescription("Downloading file...");
        request.setTitle(URLUtil.guessFileName(url, contentDisposition, mimeType));
        request.allowScanningByMediaScanner();
        request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
        request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, URLUtil.guessFileName(url, contentDisposition, mimeType));
        DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
        dm.enqueue(request);
        Toast.makeText(getApplicationContext(), "Downloading File0 ", Toast.LENGTH_LONG).show();
    }

    @SuppressLint("NewApi")
    @Override
    protected void onResume() {
        super.onResume();
        mWebView.onResume();
        Log.i(QT_TAG, "onResume: ");
        // ...
    }

    @SuppressLint("NewApi")
    @Override
    protected void onPause() {
        mWebView.onPause();
        Log.i(QT_TAG, "onPause: ");
        // ...
        super.onPause();
    }

    @Override
    protected void onDestroy() {
        mWebView.onDestroy();
        Log.i(QT_TAG, "onDestroy: ");
        // ...
        super.onDestroy();
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
        super.onActivityResult(requestCode, resultCode, intent);
        if (intent.getData() != null){
            Log.i(QT_TAG, "onActivityResult: "+ requestCode+" "+ resultCode+" "+intent.getData().toString());
        }else{
            Log.i(QT_TAG, "onActivityResult: "+ requestCode+" "+ resultCode);
        }

        mWebView.onActivityResult(requestCode, resultCode, intent);
        // ...
    }

    @Override
    public void onBackPressed() {
        if (!mWebView.onBackPressed()) {
            Log.i(QT_TAG, "onBackPressed: ");
            return; }
        // ...
        super.onBackPressed();
    }


    @Override
    public void onPageStarted(String url, Bitmap favicon) {
        Log.i(QT_TAG, "onPageStarted: "+ url);
    }

    @Override
    public void onPageFinished(String url) {
        Log.i(QT_TAG, "onPageFinished: "+ url);
    }

    @Override
    public void onPageError(int errorCode, String description, String failingUrl) {
        Log.i(QT_TAG, "onPageError "+ errorCode + " "+ description  +" "+failingUrl);
    }

    @Override
    public void onExternalPageRequest(String url) {
        Log.i(QT_TAG, "onExternalPageRequest: "+ url);

    }
}
`