What is activity in Android with example

Method overriding, static variable, package, inheritance, method and class.An activity is a single screen in android.That is to say that it can be in one of several different states, depending on what.Very similar ,android the system initializes its program through active oncreate() the.Unlike programming paradigms in which apps are launched with a main() method, the android system initiates code in an activity instance by invoking specific callback methods that correspond to specific stages of its lifecycle.

An android app may contain one or more activities, meaning one or more screens.In this way, android activity is very similar to the desktop application window.Android system initiates activity by using call back methods.Hence, there is often a need to deal with multiple activities.Provides data to applications, via a content provider your application can share data with.

Represents the presentation layer of an android application, e.g.If you have worked with c, c++ or java programming language then you must have seen that your program starts from main () function.Apps that are not in focus would have the onpause.Doing things like the above causes android system to raise various life cycle callbacks.These are basically methods that get raised in an event driven manner at various stages in the lifecycle of an activity.

All the activities in an app work together to create perfect user experience.You are declaring a method here where you have to say what you are going to do with it for example:} [/code]in this very case you are forwarding the activity into the method to do something with it.View a list of notes, read a selected note, and edit a selected or new note.Each activity is given a window in which to draw its user interface.

An incoming call comes up.