Difference between revisions of "Template:Simple Application Activity Lifecycle"

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One of the application component type is called Activity.
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== Activity Component ==
  
Activity is that part of the application that 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.
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One of the application component type is called '''Activity''' and  provides a screen for the user to interact with.
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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.
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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.
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[[Image:activity_lifecycle.png|500px| ]]
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Here is a [https://zenit.senecac.on.ca/svn/ecl500/Lectures/trunk/w11-mobile-android-simple/ sample that illustrates the activity] life cycle.
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Managing the lifecycle of an activity is defined in the '''[[how to build a simple Android app]]''' tutorial.
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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).
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== Intents ==
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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]
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[http://zenit.senecac.on.ca/wiki/index.php/Android_:_Lab Here is an example of an application that illustrates the usage of an Intent].

Latest revision as of 23:59, 8 March 2011


Activity Component

One of the application 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 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 this source illustrates the life cycle of an android activity component.

Activity lifecycle.png

Here is a 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 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 Intent object. The Intent is a message defined by a data structure holding an abstract description of an operation to be performed

Here is an example of an application that illustrates the usage of an Intent.