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What is a_view_in_android

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Fred Grott
Fred Grott

The document discusses the confusion around what constitutes a "view" in Android. It explains that a view is not a specific UI component class, but rather represents the contextual meaning or section of the screen controlled by UI components when used by controllers like activities or fragments. A view encapsulates how UI elements work together to provide part of the application's user experience or functionality.

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What is a View? Confused About A View in Android?
View Class View Class is just a UI component Just treat the sub-package name in the Android SDK as being labeled UI components
ViewGroup ViewGroup also an UI component but not a view
Layout Classes Yes, again not a view but UI components Tiring of this game yet?
Widget Classes Its a specialized UI control but again its not a view
The XML Layout file Its a configuration file for some UI components but again is NOT A VIEW
What IS A VIEW?!!! A View in the Application Architecture Patterns is a Contextual Meaning Entity You form the contextual meaning from how the UI components are used in the Controllers
Activity ViewController If you have a plain old Activity than that viewController indicates two possible contextual meanings of View The Whole Screen as View The PopUp dialogs as other Views
FragmentActivity ViewController In its contextual meaning contains no VIEWs The fragments its loading point to the contextual meaning of Views for the application
Fragment Mini-ViewController Indicates that the contextual meaning of View for the application is the section of screen it controls in the form of the UI components its loading
Conclusion A sign of a quality software engineer is the proper use of OOP terminology. Referring to Views as concrete classes shows a lack of understanding of the power of OOP. Part of the power of OOP is that the patterns have the View as a contextual meaning rather than something just concrete. Saying a XML layout configuration file is a View is like stating that a XML java Bean configuration file is a Java Bean. Wise Up People

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What is a_view_in_android

  • 1. What is a View? Confused About A View in Android?
  • 2. View Class View Class is just a UI component Just treat the sub-package name in the Android SDK as being labeled UI components
  • 3. ViewGroup ViewGroup also an UI component but not a view
  • 4. Layout Classes Yes, again not a view but UI components Tiring of this game yet?
  • 5. Widget Classes Its a specialized UI control but again its not a view
  • 6. The XML Layout file Its a configuration file for some UI components but again is NOT A VIEW
  • 7. What IS A VIEW?!!! A View in the Application Architecture Patterns is a Contextual Meaning Entity You form the contextual meaning from how the UI components are used in the Controllers
  • 8. Activity ViewController If you have a plain old Activity than that viewController indicates two possible contextual meanings of View The Whole Screen as View The PopUp dialogs as other Views
  • 9. FragmentActivity ViewController In its contextual meaning contains no VIEWs The fragments its loading point to the contextual meaning of Views for the application
  • 10. Fragment Mini-ViewController Indicates that the contextual meaning of View for the application is the section of screen it controls in the form of the UI components its loading
  • 11. Conclusion A sign of a quality software engineer is the proper use of OOP terminology. Referring to Views as concrete classes shows a lack of understanding of the power of OOP. Part of the power of OOP is that the patterns have the View as a contextual meaning rather than something just concrete. Saying a XML layout configuration file is a View is like stating that a XML java Bean configuration file is a Java Bean. Wise Up People
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