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Android is one of the most popular and commonly used mobile operating systems. The process of developing software only for Android devices is called Android software development. We have mentioned four primary components used in Android development, along with some other essential components. All these components are loosely-coupled. The application manifest file is responsible for coupling these components together. An Android application, even if it is small, consists of at least one activity class. Developers build the user interface of any Android application around the extensions of the Activity class.