An Android app consists of components such as activities, services, broadcast receivers, and content providers, as shown in Figure 2-1. Activities are for interacting with device users, services are for program parts that run without a dedicated user interface, broadcast receivers listen for standardized messages from other apps and components, and content providers allow other apps and components to access a certain amount and kind of data provided by a component.
Figure 2-1
An app in the Android OS
Components ...
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