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Version Date Modified Size Author Changes ... Change note
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At line 206 added 39 lines
! week 4
__User Interfaces__
The View is the place and the means to exchange information between the user and the Application.
View is the key building block. It occupies a rectangular space on the screen, they are responsible for drawing themselves and handling events.\\
Predefined Views:
* __Button__ simple button to perform some action
* __ToggleButton__ - checked/not-checked state, light indicator showing state
* __Checkbox__ - another kind of 2-state button
* __RatingBar__ - row of stars
* __AutoCompleteTextView__ - an editable text field that provides completion suggestions as you type text
Common View operations:
* set visibility
* set checked state
* set listeners
* set props like background, opacity, orientation
* manage input focus
View Listener Interfaces:
* OnClickListener
* OnLongClicklistener
* OnFocusChanged
* OnKeyListener
* many more...
Displaying Views
Views are organized as a tree, Views with child Views
Android walks the View tree three times:
# measure all views
# layout views
# draw views