我觉得它们都是相同的
来自于这里 http://developer.android.com/guide/topics/manifest/activity-element.html#nohist
android:noHistory
A value of "true" means that the activity will not leave a
historical trace. It will not remain in the activity stack
for the task, so the user will not be able to return to it.
所以
历史轨迹 = 活动堆栈(保存最近的活动)= 历史堆栈
我们都知道,返回堆栈 是保存最近活动的一个。
因此,它们基本上是同一件事情。