我注意到，在新的谷歌应用程序，他们正在更新的小家/向上图标可以不是箭，但三个小线（至少在Android 4.2）。

I noticed that with the new Google apps, they are updating the little Home/Up icon to not be the arrow, but three little lines (at least on Android 4.2).

它们是如何实现这一点？我没有看到在动作条为它的API ...

How are they accomplishing this? I am not seeing an API for it in the ActionBar...

推荐答案

这就是所谓的ActionBarDrawerToggle并且意欲将与DrawerLayout.

你可以在这里找到一个样本实现 ，如果​​你只关心的图标：你可以从下载它们here.

It's called an ActionBarDrawerToggle and is intended to be used with the DrawerLayout.

You can find a sample implementation here and if you are only interested in the icons: you can download them from here.