活动左上角后退按钮

Slv*_*v3r 4 android android-activity

I've a simple question; I noticed that some activities have in their top-left corner a back button (for example in contacts details) Is it possible to display it in any kind on activities? If yes, How?

Thanks!

Com*_*are 9

这被称为"向上"导航(尽管它指向左侧......).您可以通过启用它调用setDisplayHomeAsUpEnabled(true)ActionBar.