loadWebView

private void loadBKashWebView(final String orderId, double grandTotal) {

        PaymentRequest paymentRequest = new PaymentRequest();
        paymentRequest.setAmount(String.valueOf(grandTotal));
        paymentRequest.setIntent("sale");
        paymentRequest.setOrderId(orderId);

        Gson gson = new Gson();
        request = gson.toJson(paymentRequest);

        rootLayout.setVisibility(View.GONE);
        paymentWebView.setVisibility(View.VISIBLE);

        WebSettings webSettings = paymentWebView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        paymentWebView.setClickable(true);
        paymentWebView.getSettings().setDomStorageEnabled(true);
        paymentWebView.getSettings().setAppCacheEnabled(false);
        paymentWebView.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);
        paymentWebView.clearCache(true);
        paymentWebView.getSettings().setAllowFileAccessFromFileURLs(true);
        paymentWebView.getSettings().setAllowUniversalAccessFromFileURLs(true);

        paymentWebView.addJavascriptInterface(new JavaScriptInterface(getContext()), "AndroidNative");

        paymentWebView.loadUrl("file:///android_asset/www/checkout.html");

        paymentWebView.setWebChromeClient(new WebChromeClient());
        paymentWebView.setWebViewClient(new CheckoutWebViewClient());
    }

    class CheckoutWebViewClient extends WebViewClient {

        public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
            handler.proceed();
        }

        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            if (url.equals("https://www.bkash.com/terms-and-conditions")) {
                Intent myIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
                startActivity(myIntent);
                return true;
            }
            return super.shouldOverrideUrlLoading(view, url);
        }

        @Override
        public void onPageStarted(WebView view, String url, Bitmap favicon) {
            setProgressDialog();
        }

        @Override
        public void onPageFinished(WebView view, String url) {

            paymentWebView.loadUrl("javascript:setUrls('" + BKASH_PAYMENT_CREATE + "','" + BKASH_PAYMENT_EXECUTE + "')");
            String paymentRequest = "{paymentRequest:" + request + "}";
            paymentWebView.loadUrl("javascript:callReconfigure(" + paymentRequest + " )");
            paymentWebView.loadUrl("javascript:clickPayButton()");

            if (url.equalsIgnoreCase("file:///android_asset/www/checkout.html")) {
//                String paymentRequest = "{paymentRequest:" + request + "}";
//                paymentWebView.loadUrl("javascript:callReconfigure(" + paymentRequest + " )");
//                paymentWebView.loadUrl("javascript:clickPayButton()");
            } else if (url.equalsIgnoreCase("file:///android_asset/www/checkoutSuccess.html")) {
                showToast("Payment successful");
                showSuccessPopUp(orderId);
            } else if (url.equalsIgnoreCase("file:///android_asset/www/checkout_failed.html")) {
                showToast("bKash Payment failed");
                showSuccessPopUp(getString(R.string.online_order_failed_placeholder));
            }

            if (pDialog != null) {
                dismissDialog();
            }
        }

    }