How to manage activity stack?

Question

When my stack is in this situation:

A->B->C

if I start D activity, I want that the activity stack becomes:

A->D

Note that activity C is a dialog.

score 5 · Accepted Answer · edited Sep 14 '15 at 04:02

5

here are the steps which will do the needed:

from activity C launch the activity A with a boolean fromActivityC bundled with the intent and the flag FLAG_ACTIVITY_CLEAR_TOP set .
Now in the on create of the activity A check for this boolean "fromActivityC" first and if present launch the activity D else the normal flow continues.
```
// following code can be used to get the boolean in the oncreate
boolean entrypoint=this.getIntent().getExtras().getBoolean("fromActivityC");
```

A lil workaround but Hope it helps

edited Sep 14 '15 at 04:02

kenju

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answered Jun 16 '11 at 10:49

Nitin

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Thanks, interesting trick, it runs ... But typing on keyboard I had an idea: when A calls B, finish A; when B goes back, recreate A; when C calls D, create D with FLAG_ACTIVITY_CLEAR_TOP. Yessss!! – Michele Jun 16 '11 at 13:32
yes that should work .. but dont you think re creating activities like this everytime will take a lot of cpu cycles and defeats the very purpose of the activity stack..something to ponder upon :) – Nitin Jun 16 '11 at 13:35

score 2 · Answer 2 · edited May 23 '17 at 11:44

2

There is several way to remove a activity from the stack or prevent it to be stacked :

To remove your activity from the stack , simply call finish(), see here.

You can also implement in your manifest the property : android:noHistory="true" which prevent an activity to be stacked.

See this question form more detail : Removing an activity from the history stack

edited May 23 '17 at 11:44

Community

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answered Jun 16 '11 at 09:52

grunk

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score 1 · Answer 3 · answered Jun 16 '11 at 09:48

1

A little hacky, but you could start activity A while clearing the stack, then start activity D.

Activity A might appear for a moment before disappearing though

answered Jun 16 '11 at 09:48

Kurru

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score 1 · Answer 4 · edited Feb 10 '12 at 10:14

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You could try finishing ActivityB when you launch ActivityC and the same in ActivityC when launching A.

Your code would look like this:

Intent i = new Intent(this.class.ActivityC);
startActivity(i);
ActivityB.finish();

edited Feb 10 '12 at 10:14

Gilles 'SO- stop being evil'

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answered Jun 16 '11 at 09:58

martincm

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I can't, activity C is a dialog. If I finish B when I start C I see A under C. – Michele Jun 16 '11 at 10:22

score 0 · Answer 5 · answered Mar 25 '13 at 11:38

0

on callback of C , pass a message back to A and start your D from Acall finish , this will finish B and C (because C is apart of B).

answered Mar 25 '13 at 11:38

Adeel

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score 0 · Answer 6 · answered Jan 29 '14 at 23:32

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here is a better solution not depending on evaluating the Intent content in A: use the flag FLAG_ACTIVITY_TASK_ON_HOME

you should also take a look at the other flags Android Intent

answered Jan 29 '14 at 23:32

A. Binzxxxxxx

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How to manage activity stack?

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