Developing two android apps and communicating between two

Question

I am developing two applications names A and B.

Application A as activity named MainActivity, servic

Answer 1

You can't share methods and code segments between different applications, but you can use intents to send data bundles back and forth, check this similar question:

android communication between two applications

Answer 2

You cannot directly access methods of Activity in different app.

Broadcast would work but if you want more control (i.e. invoke remote methods) consider binding to a remote service in the other app or use Messenger and handler to communicate.

Here is a short tutorial on inter-app communication