how Data transfer can be done from service to activity?

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http://stackoverflow.com – I have multiple applications and a single service, i want to create a communication between the apps and the service. I am saving the value in the service which one of the application has sent. Now I am trying to read the same value by some another application from the service. How this can be achieved? I don't want to call explicit intent from the service and neither implicit intents since implicit intents will give a selection option to choose the desired app, which i don't want. Please advice. (HowTos)