How to pass data both ways between different android applications?

Question

What\'s the easiest way to pass string variables from one application to another and also return values back? I have access to the source code of both apps, but

Answer 1

AIDL is one means of communication between two different applications using Interfaces

http://developer.android.com/guide/components/aidl.html

You can find a working sample in the below tutorial http://manishkpr.webheavens.com/android-aidl-example/