Komponen Aplication

Important features of Android is that one application can make use of elements of other applications (for applications that are possible). For example, an application requires scroller features and other applications have developed good scroller features and allows other applications to use. So developers do not need to develop something similar to the application,simply

use the existing scroller [developer.android.com].For the feature to work, the system must be able to run the application when any part of the application that is needed, and calling java objects to parts of it. Android therefore differs from other systems, Android does not have a main view programs such as the function main () in other applications. Instead, the application has a critical component that enables the system to call and run when needed.