Hello A. Elk,
Yes, I am doing MPNA "make an high performance networking application"
During the course we learned about C programming, threading, networking, etc
My teacher himself read about Android and it's possibility to share data
between two apps and gave us the assignment to find out about having the
same UID and be able to communicate.
After searching for weeks, I know that android security is not fond of
such practices, Android has a few ways to communicate, for example
content manager.
We have have made a server / client app using sockets in C, because that
was the easiest and most straightforward way we knew. But even then I
like to know how to share data using the same UID.
Just to show our teacher "found it!" Althought the assignment was not
clear or good enough we tried our best.
Would be great if someone could tell about sharing with UID, even
thought it will not influence our assigment results any longer. If you
or someone else knows, do send an e-mail. So that we might close the
"quest" with good content....
Kindest regards,
Cw
Op 19-1-2012 23:18, A. Elk schreef:
Are you sure that this is the assignment?
You can force two applications to have the same UID by using an
attribute of the <manifest> element in AndroidManifest.xml. This is
documented in Security and Permissions,
http://developer.android.com/guide/topics/security/security.html. This
guide also describes the ramifications of sharing a UID. Once you do
this, the two application are treated as "one" by Android, so they
share the same "sandbox". This means that a file written by one can be
read by another. To share a variable, you could create an object and
then serialize it to a file.
However, I strongly recommend against doing this sort of thing. It's
not the way Android is designed to work. Applications should avoid
knowing too much about one another. An application A should use common
APIs to send information to an application B, with the assumption that
B could be anything.
In summary, I think it's a bad assignment.
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