android - Acivity back stack -

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From 'A' I am saying activity 'B', I have three activities A, B and C to maintain the activity of the state of C. I <...
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'In addition to the flag' FLAG_REORDER_TO_FRONT 'with the same flag and from' B 'to' C ', I'm dominating with' B 'to' B 'with FLAG_REORDER_TO_FRONT. Now, if I am pressing the back button on Activity A, then this activity is telling B and if the activity is pressed on the back button, it opens. B

In this way it went into a loop, how can I correct this behavior and apply the proper backstack.

Thanks


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