67.2 Bound Service Interaction Options

There are two recommended mechanisms for implementing interaction between client components and a bound service. In the event that the bound service is local and private to the same application as the client component (in other words it runs within the same process and is not available to components in other applications), the recommended method is to create a subclass of the Binder class and extend it to provide an interface to the service. An instance of this Binder object is then returned by the onBind() method and subsequently used by the client component to directly access methods and data held within the service.

In situations where the bound service is not local to the application (in other words, it is running in a different process from the client component), interaction is best achieved using a Messenger/Handler implementation.

In the remainder of this chapter, an example will be created with the aim of demonstrating the steps...