android.app or android.graphics library? Or class storage? Who is "on the fingers" can explain?

Closed due to the fact that the issue is too common for participants Streletz , Denis , pavel , D-side , Kromster 17 Aug '16 at 5:40 .

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    3 answers 3

    android.app and android.graphics are packages. If on fingers, then packages are a named collection of classes (and, possibly, packages). Packages group classes with similar functionality.

      It is more correct to call it a package (in Java terminology) with a set of classes. However, there may be other packages inside the package.

        android.app is a package containing high-level classes designed to describe a common model of android applications. There are four main components for Android applications whose use is governed by the functionality of the application being developed: Activity, Service (located in the android.app package) and BroadcastReceiver, ContentProvider (located in the android.content package). The package also defines classes describing dialogs, notifications and action bars, which can also be application components.

        android.graphics is a package containing classes providing low-level graphical tools.