Android Launcher View构架浅析

背景：

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" />

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