launcher5.0-view结构

参考：http://blog.csdn.net/wdaming1986/article/details/7671318

http://www.cnblogs.com/DonkeyTomy/articles/3229764.html

查看Launcher.xml 

<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:launcher="http://schemas.android.com/apk/res/com.android.launcher5"

    android:id="@+id/launcher"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/workspace_bg">

    <com.android.launcher2.DragLayer
        android:id="@+id/drag_layer"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fitsSystemWindows="true">

        <!-- Keep these behind the workspace so that they are not visible when
             we go into AllApps -->
        <include
            android:id="@+id/dock_divider"
            layout="@layout/workspace_divider"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="@dimen/button_bar_height"
            android:layout_gravity="bottom" />

        <include
            android:id="@+id/paged_view_indicator"
            layout="@layout/scroll_indicator"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom"
            android:layout_marginBottom="@dimen/button_bar_height" />

        <!-- The workspace contains 5 screens of cells -->
        <com.android.launcher2.Workspace
            android:id="@+id/workspace"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:paddingStart="@dimen/workspace_left_padding"
            android:paddingEnd="@dimen/workspace_right_padding"
            android:paddingTop="@dimen/workspace_top_padding"
            android:paddingBottom="@dimen/workspace_bottom_padding"
            launcher:defaultScreen="2"
            launcher:cellCountX="@integer/cell_count_x"
            launcher:cellCountY="@integer/cell_count_y"
            launcher:pageSpacing="@dimen/workspace_page_spacing"
            launcher:scrollIndicatorPaddingLeft="@dimen/workspace_divider_padding_left"
            launcher:scrollIndicatorPaddingRight="@dimen/workspace_divider_padding_right">

            <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" />
        </com.android.launcher2.Workspace>

        
        <!-- 下部快捷icon -->
        <include layout="@layout/hotseat"
            android:id="@+id/hotseat"
            android:layout_width="match_parent"
            android:layout_height="@dimen/button_bar_height_plus_padding"
            android:layout_gravity="bottom" />

        <include
            android:id="@+id/qsb_bar"
            layout="@layout/qsb_bar" />

        <!-- The Workspace cling must appear under the AppsCustomizePagedView below to ensure
             that it is still visible during the transition to AllApps and doesn't overlay on
             top of that view. -->
        <include layout="@layout/workspace_cling"
            android:id="@+id/workspace_cling"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:visibility="gone" />

        <include layout="@layout/folder_cling"
            android:id="@+id/folder_cling"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:visibility="gone" />

        <com.android.launcher2.DrawableStateProxyView
            android:id="@+id/voice_button_proxy"
            android:layout_width="80dp"
            android:layout_height="@dimen/qsb_bar_height"
            android:layout_gravity="top|end"
            android:clickable="true"
            android:onClick="onClickVoiceButton"
            android:importantForAccessibility="no"
            launcher:sourceViewId="@+id/voice_button" />

        <include layout="@layout/apps_customize_pane"
            android:id="@+id/apps_customize_pane"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:visibility="invisible" />
    </com.android.launcher2.DragLayer>
</FrameLayout>

了解桌面的整体结构 

com.android.launcher2.DragLayer 

整个布局的根，DragLayer继承了FrameLayout，所以DragLayer本身可以看作是一个FrameLayout。

dock_divider

翻页指示滑动条。include包含了另外一个布局文件workspace_divider.xml ，而这个workspace_divider.xml包含了一ImageView。

paged_view_indicato

翻页指示滑动条上的蓝色滑块。同样它包含了scroll_indicator.xml，其中包含了一个ImageView

com.android.launcher2.Workspace

核心桌面，包含5个桌面项（workspace_screen）

hotseat

底部快捷icon图标区域

qsb_bar

顶部的搜索框。包含搜索view（qsb_search_bar）和内容下拉view（drag_target_bar）

workspace_cling  和 folder_cling

刚刷完机后，进入桌面时，显示的使用向导界面，介绍怎么使用workspace和folder，跳过以后就再也不会出现了

com.android.launcher2.DrawableStateProxyView 

5.0新加入的view吧，个人认为是为了voice按钮点击范围做的一个代理view，点击此view执行点击搜索按钮的功能

apps_customize_pane

点击底部快捷图标allapp按钮后，显示所有应用程序的按钮后才会从隐藏状态转换为显示状态，显示所有应用程序和所有插件的界面。