You might try along the lines of using:

android.permission.GET_TASKS

In your manifest and then code similar to:

http://davanum.wordpress.com/2007/12/18/android-task-manager-primitive-prototype/

But I would strongly recommend you don't ask for that permission and instead do 
what Kumar suggested, perhaps increment/decrement a static AtomicInteger if you 
only care about Activities within your own Application.

Richard

On 17 Jan 2011, at 21:11, Hari Edo wrote:

> 
> If you make a new class MyActivity extending Activity, then you make
> all of your activites extend MyActivity instead, then you can
> implement whatever instance tracking you'd like to do.  But Java (and
> thus Dalvik) have no way to reflect and iterate all object instances
> of a class, extended class, or interface implementors.
> 
> I don't think the android stack is exposed for inspection either.
> 
> On Jan 17, 3:54 pm, Sudhakar Chavali <sudhakar.koundi...@gmail.com>
> wrote:
>> Hello All
>> 
>> Is there a way to know the count of activities exists in Application
>> stack?
>> 
>> Thanks & Regards
>> Sudhakar Chavali
> 
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