[android-developers] Is onDetachedFromWindow more reliable than onStop

Hi,
We developed two heavy apps, A,B.
A startActivity B and B comes back to A by startActivity too.
We record one flag in A's onStop to remember going to background and
restore that flag in onStart.
After switching between A and B rapidly, we found A's onStop often get
called by system later than B's onResume.
Sometimes even later than A's second onResume.

So we have to find the other way to tell foreground and backgroud.
We got two proposals:
1) onDetachedFromWindow
2) ActivityManager.getRunningTasks

Any words about it will be appreciated.

James

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