[android-developers] Why most file browsers are implemented as activities?

Folks,

I have been looking around for code that would let users select a file
from the sd card. I have seen a few implementations for such an "open
file" dialog. However, all of them have been implemented as activities
and not as a dialog. I am wondering why developers are implementing it
this way. For me, it appears "open file" must be a dialog.

Thank you in advance for enlightening me.

Regards,
Peter

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