Android Launcher View构架浅析

1. 先来看一下launcher activity view的架构图（hierarchyviewer.bat工具获取）：2. 再来看layout/launcher.xml, layout-port/launcher.xml, 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.AllAppsGridView 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:drawSelectorOnTop="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. 呈现界面：（）其中Workspace可增加到任意多个cell，如7个： 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" />