Android activity stack

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Hi ,

I have a situation where i will have totally 5 activities. A,B,C,D,E. In activity stack there can be only three activities that is A,B,E or A,C,E or A,D,E so Activity A and E should be there in stack also other activities state should be saved so that i can get the activity as it was before.

to complete this task i have following queries

1.How to check whether a particular activity is there in stack already.

2. if it is there how to save its state so that i can replace the current activity with new activity.

3.How to replace one activity with another activity but keeping the state of the old activity.

I would be thankful to you if u give me the correct solutions

Posted 5-Dec-13 18:27pm

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Serge Desmedt · Answer 1 · 2013-12-09T09:47:00

I'm not sure why you want to maintain the stack yourself, as android already keeps a stack of the activities: starting an activity pushes one on the stack, going back pops it from the stack.

I suppose deciding in activity A what will be your next activity b, C or D should do it. But then from your description I cannot tell if your use case allows for this decision.

about saving your activities state: check out Recreating an Activity

Xiao Ling · Answer 2 · 2013-12-18T22:18:00

1. use ActivityManager to find running activities http://developer.android.com/reference/android/app/ActivityManager.html[^]
2. the activity states should be saved when the activity is paused. start a new activity with new state.
3. don't replace. just create a new one. or you can resume the previous activity and send changed data back by setResult. The pre-condition is you should use startActivityForResult not just startActivity

Android activity stack

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