About TabActivity,ActivityGroup,and Activity

I have开发者_Go百科 a TabActivity,which host an ActivityGroup.the ActivityGroup started an activity,When I press the back button,which "onBackPressed" Method will be called?

If you have not overriddedn on BackPressed the back press will result in going to the activity before the tabwidget. If you want to override this you need to do it in the individual activites under the tab.