Analysis of Android launcher view architecture

1. First, let's take a look at the structural diagram of the launcher activity view (obtained by hierarchyviewer. BAT ):

 

2. Let's take a look at layout/launcher. XML, layout-Port/launcher. XML, and layout-land/launcher. xml.

 

 

<Com. Android. launcher. draglayer

Xmlns: Android = "http://schemas.android.com/apk/res/android"

Xmlns: launcher = "http://schemas.android.com/apk/res/com.android.Launcher"

 

Android: Id = "@ + ID/drag_layer"

Android: layout_width = "fill_parent"

Android: layout_height = "fill_parent"

Android: Background = "# fff">

 

<! -- The workspace contains 3 screens of cells -->

<Com. Android. launcher. Workspace

Android: Id = "@ + ID/workspace"

Android: layout_width = "fill_parent"

Android: layout_height = "fill_parent"

 

Launcher: defaultscreen = "1">

 

<Include Android: Id = "@ + ID/cell1" layout = "@ layout/workspace_screen"/>

<Include Android: Id = "@ + ID/cell2" layout = "@ layout/workspace_screen"/>

<Include Android: Id = "@ + ID/cell3" layout = "@ layout/workspace_screen"/>

 

</COM. Android. launcher. workspace>

 

<Slidingdrawer

Android: Id = "@ + ID/drawer"

Android: layout_width = "fill_parent"

Android: layout_height = "fill_parent"

 

Android: Orientation = "horizontal"

Android: bottomoffset = "4dip"

Android: handle = "@ + ID/all_apps"

Android: content = "@ + ID/content">

 

<Com. Android. launcher. handleview

Android: Id = "@ ID/all_apps"

Android: layout_width = "56dip"

Android: layout_height = "56dip"

 

Android: Background = "@ drawable/handle"

 

Android: focusable = "true"

Android: clickable = "true"

 

Android: scaletype = "center"

Android: src = "@ drawable/handle_icon"

 

 

Launcher: Direction = "vertical"/>

 

<Com. Android. launcher. all1_gridview

Android: Id = "@ ID/content"

Android: layout_width = "fill_parent"

Android: layout_height = "fill_parent"

 

Launcher: texture = "@ drawable/pattern_carbon_fiber_dark"

 

Android: scrollbarstyle = "outsideinset"

Android: drawselectid Top = "false"

Android: listselector = "@ drawable/grid_selector"

 

Android: nextfocusleft = "@ ID/all_apps"

Android: nextfocusdown = "@ ID/content"

Android: nextfocusup = "@ ID/content"

Android: nextfocusright = "@ ID/content"

 

Android: verticalspacing = "10dip"

Android: numcolumns = "5"/>

 

</Slidingdrawer>

 

<Com. Android. launcher. deletezone

Android: Id = "@ + ID/delete_zone"

Android: layout_width = "49dip"

Android: layout_height = "wrap_content"

 

Android: scaletype = "center"

Android: src = "@ drawable/ic_delete"

Android: Background = "@ drawable/delete_zone_selector"

 

Android: layout_marginbottom = "-25dip"

Android: layout_gravity = "right | center_vertical"

Android: visibility = "gone"

 

Launcher: Direction = "vertical"/>

 

</COM. Android. launcher. draglayer>

 

 

 

3. Presentation Interface :()

 

 

The workspace can be added to any number of cells, for example, 7:

Launcher: defaultscreen = "3">

 

<Include Android: Id = "@ + ID/cell1" layout = "@ layout/workspace_screen"/>

<Include Android: Id = "@ + ID/cell2" layout = "@ layout/workspace_screen"/>

<Include Android: Id = "@ + ID/cell3" layout = "@ layout/workspace_screen"/>

<Include Android: Id = "@ + ID/cell4" layout = "@ layout/workspace_screen"/>

<Include Android: Id = "@ + ID/cell5" layout = "@ layout/workspace_screen"/>

<Include Android: Id = "@ + ID/cell6" layout = "@ layout/workspace_screen"/>

<Include Android: Id = "@ + ID/cell7" layout = "@ layout/workspace_screen"/>

 

 

Reprinted Please note: http://blog.csdn.net/ccwwff/archive/2011/01/05/6118618.aspx