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I am confused as to the difference between the two. In my application I have just used Extends Activity and the application is working perfectly, so what is the purpose of Extends Application?.
Would you use it on the first class you create in the Android application?
Thanks.
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Activity is the basic one. Based on Activity , FragmentActivity provides the ability to use Fragment . Based on FragmentActivity , AppCompatActivity provides features to ActionBar .
Definition and Usage The extends keyword extends a class (indicates that a class is inherited from another class). In Java, it is possible to inherit attributes and methods from one class to another. We group the "inheritance concept" into two categories: subclass (child) - the class that inherits from another class.
Extensions provide a means of associating additional attributes with users or public keys and for managing a certification hierarchy. The extension format also allows communities to define private extensions to carry information unique to those communities.
The Application class in Android is the base class within an Android app that contains all other components such as activities and services. The Application class, or any subclass of the Application class, is instantiated before any other class when the process for your application/package is created.
The android.app.Application class is an optional facility for extending and storing application-global state. There are other ways of doing this, so most apps don't customize this class.
Activities however are what defines every major stage of your application. It wouldn't be possible to build an application without Activities. You will have a main Activity class and this will indeed be defined with 'extends Activity'.
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