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One of the application component type is called '''Activity''' and provides a screen for the user to interact with.
Based of the user input on the activity screen, the operating system calls into your class some important methods. The figure from [http://d.android.com/guide/topics/fundamentals/activities.html this source] illustrates the life cycle of an android activity component.
[[Image:activity_lifecycle.png|500px| ]]
Here is a [https://zenit.senecac.on.ca/svn/ecl500/Lectures/trunk/w11-mobile-android-simple/ sample that illustrates the activity] life cycle.
Managing the lifecycle of an activity is defined in the '''[[how to build a simple Android app]]''' tutorial.
Furthermore learn how to achieve internationalization by understanding [https://zenit.senecac.on.ca/svn/ecl500/Lectures/trunk/w11-mobile-android-hello-international/ this code]. Try to modify it by adding a new language (yours, if it is different from sample's).
== Intents ==
The activities, services and broadcast receivers are activate through '''intents''' that are instances of the [http://developer.android.com/reference/android/content/Intent.html Intent] object. The Intent is a message defined by a data structure [http://developer.android.com/guide/topics/intents/intents-filters.html holding an abstract description of an operation to be performed]
[http://zenit.senecac.on.ca/wiki/index.php/Android_:_Lab Here is an example of an application that illustrates the usage of an Intent].
