58.11 Adding Threading to the Service
As outlined in “A Basic Overview of Java Threads, Handlers and Executors”, when an Android application is first started, the runtime system creates a single thread in which all application components will run by default. This thread is generally referred to as the main thread. The primary role of the main thread is to handle the user interface in terms of event handling and interaction with views in the user interface. Any additional components that are started within the application will, by default, also run on the main thread.
As demonstrated in the previous section, any component that undertakes a time consuming operation on the main thread will cause the application to become unresponsive until that task is complete. It is not surprising, therefore, that Android provides an API that allows applications to create and use additional threads. Any tasks performed in a separate thread from the main thread are essentially performed...
