活动开始另一个活动。 确保第一个活动的onPause将在第二个活动的onResume之前调用

Question

I have an Activity A and Activity B. Activity A starts Activity B.

Is there a guarantee that A's onPause() will always be called before calling B's onResume()?

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Answer 1

Found the answer here :

When activity B is launched in front of activity A, this callback will be invoked on A. B will not be created until A's onPause() returns, so be sure to not do anything lengthy here.

Answer 2

onPause ()

When activity B is launched in front of activity A, this callback will be invoked on A. B will not be created until A's onPause() returns , so be sure to not do anything lengthy here

http://developer.android.com/reference/android/app/Activity.html#onPause()

Answer 3

Yes. Activity A 's onPause() will be called before passing to Activity B 's onResume() if the navigation is not the first time. If navigating to Activity B is for the first time, then Activity B 's onCreate() will be called after Activity A's onPause() . Take a look at Activity's Lifecycle for clear understanding.