I've created an application with a menubar, this menubar is shown in android >4.0 (galaxy III), but in android 2.3.5 (galaxy ace) it isn't show. What do I do for the menubar is shown correctly in both versions? thank u.
If you mean ActionBar, it's available only from Android 3.0: http://developer.android.com/guide/topics/ui/actionbar.html
You can control the behaviors and visibility of the action bar with the ActionBar APIs, which were added in Android 3.0 (API level 11).
If you want to add an ActionBar to your 2.3.5 application you should take a look at http://actionbarsherlock.com/
Regards