startActivity(new Intent(Intent.ACTION_VIEW,Uri.parse("http://www.youtube.com/watch?v=B1g_ouW6Tos")));
is enough for that operation.
Edit: If you want to add webview use that example; Add your layout a webview;
<WebView
android:id="@+id/webView"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
Then in your class add this codes;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
WebView webView = (WebView) findViewById(R.id.webView);
WebSettings settings = webView.getSettings();
settings.setLoadWithOverviewMode(true);
settings.setUseWideViewPort(true);
detailView.setWebViewClient(new Client());
detailView.loadUrl("http://www.youtube.com/watch?v=B1g_ouW6Tos");
}
private class Client extends WebViewClient {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
}