pDialog = new ProgressDialog(Units.this);
    pDialog.setTitle("Please Wait");
    pDialog.setMessage("Loading...");
    pDialog.setIndeterminate(false);
    pDialog.setCancelable(false);
    webview = (WebView) findViewById(R.id.webView1);
    webview.getSettings().setJavaScriptEnabled(true);
    webview.setWebViewClient(new WebViewClient() {
        @Override
        public void onPageStarted(WebView view, String url, Bitmap favicon) {
            super.onPageStarted(view, url, favicon);
            pDialog.show();
        }

        @Override
        public void onPageFinished(WebView view, String url) {
            super.onPageFinished(view, url);
            pDialog.dismiss();
        }
    });
    String pdf = "http://XX.xxx.xx.xxx/webservice/testbook.pdf";
    webview.loadUrl("http://docs.google.com/gview?embedded=true&url=" + pdf);
}