My bookmarks from Diigo 05/05/2009

• Declaring Layout | Android Developers

  tags: android, layout, view

  • android:id="@+id/my_button"
  • The at-symbol (@) at the beginning of the string indicates that the XML parser should parse and expand the rest
    of the ID string and identify it as an ID resource. The plus-symbol (+) means that this is a new resource name that must
    be created and added to our resources (in the R.java file). There are a number of other ID resources that
    are offered by the Android framework

  • When referencing an Android resource ID, you do not need the plus-symbol,
    but must add the android package namespace, like so:

    
    

    android:id="@android:id/empty"

• How Android Draws Views | Android Developers

  tags: android, views, howto

  • Drawing the layout is a two pass process: a measure pass and a layout pass. The measuring
    pass is implemented in measure(int, int) and is a top-down traversal
    of the View tree. Each View pushes dimension specifications down the tree
    during the recursion. At the end of the measure pass, every View has stored
    its measurements. The second pass happens in
    layout(int, int, int, int) and is also top-down. During
    this pass each parent is responsible for positioning all of its children
    using the sizes computed in the measure pass.

Posted from Diigo. The rest of my favorite links are here.