I plan to kill all activities in the app, of course. 
 
If all activities in the app are my own, the goal can be easily implemented.
 
However, now we need to call a thrid-party activity, such as Gallery (yes, 
we could design our gallery. Here is an example):
So if the user presses HOME button when he is during Gallery, I still want 
to kill activities in the app, including Gallery.
 
 

On Tuesday, July 9, 2013 11:44:15 AM UTC-5, Kristopher Micinski wrote:

> It sounds like your design is flawed and completely insecure:  you 
> really thinking that not showing the user the screen any more --- even 
> though you're going through another app and handing all the sensitive 
> information to it --- sounds like a good security policy? 
>
> Merely "not showing" the screen sounds like a non solution. 
>
> Kris 
>
> On Tue, Jul 9, 2013 at 12:39 PM, Linda Li 
> <codingpo...@gmail.com<javascript:>> 
> wrote: 
> > You cannot get the activity ID of the thrid-party activity, such as 
> Gallery. 
> > 
> > On Tuesday, July 9, 2013 8:03:57 AM UTC-5, Kristopher Micinski wrote: 
> >> 
> >> so call finish in onPause? 
> >> 
> >> Kris 
> >> 
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