Android primary building blocks
A typical Android application is composed of the following four main building blocks:
android.app.Activityandroid.app.Serviceandroid.content.BroadcastReceiverandroid.content.ContentProvider
The Activity, Service, and BroadcastReceiver are activated explicitly or implicitly over an asynchronous message called Intent.
Each of these building blocks have their own life cycle, so they could be exposed to different concurrency issues if an asynchronous architecture is used to offload work from the main thread.
Activity concurrent issues
The Activity building block has a tight connection with a presentation layer because it's the entity that manages the UI view over a defined tree of fragments and views that display information ...
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