Open url in Webview in android

WebView webview =( WebView)findViewById(R.id.webView1);
webview.getSettings().setJavaScriptEnabled(true);
webview.getSettings().setLoadWithOverviewMode(true);
webview.getSettings().setUseWideViewPort(true);
webview.setWebViewClient(new WebViewClient());
webview.loadUrl("http://www.youtube.com/");