One of the application component type is called == Activity.Component ==
Activity is that part One of the application that component type is called '''Activity''' and provides a screen for the user to interact with. The activity object could be created from a subclass of the [[http://d.android.com/reference/android/app/Activity.html Activity]class or one of its subclasses. 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] class.
