Android securities and permissions : Can one application having Linux process user id 1, touch other application property or elements directly?
No, in Linux one app cant touch or intrude into other app with out androids system permission.
yes, it is possible, android will not throw any problem.
yes, it is possible if both applications have same user id.
option 3 is wrong, as there is no scenario where two android applications can share same user id.
Generally in android one application can't touch other apps components directly due to OS level security. But if two apps are having same Linux user id, it is possible.
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