Android4.2_Launcher_launcher.xml

Posted 2022-11-08

1.概述。

launcher.xml作为主Activity的布局文件，分布在好几个配置文件中，layout-land（横屏）,layout-port（竖屏）等。他们都会在生成在资源文件中（？),最终系统会选择使用那一个配置文件。比如我现在使用的是720p的。

2.结构

<FrameLayout
   -- FrameLayout <com.android.launcher2.DragLayer
      -- ImageView dock_divider 就是显示的一条白线。
      -- ImageView paged_view_indicator 切换屏幕时显示的指示器。
      -- ViewGroup Workspace 已经是经过层层包装的，但本质还是ViewGroup。
         -- CellLayout workspace_screen workspace中放的五个页面。
         ...
      -- hotseat 可以放快捷方式，还有一个Allapp按钮。
      -- qsb_bar 搜索按钮。quick search bar。
      -- workspace_cling 第一次进入系统时显示的指导页面。
      -- <com.android.launcher2.DrawableStateProxyView
      -- <com.android.launcher2.AppsCustomizeTabHost 点击AllApp显示。

源码：

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2007 The Android Open Source Project

     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at

          http://www.apache.org/licenses/LICENSE-2.0

     Unless required by applicable law or agreed to in writing, software
     distributed under the License is distributed on an "AS IS" BASIS,
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
     limitations under the License.
-->

<!-- Full screen view projects under the status bar and contains the background -->
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:launcher="http://schemas.android.com/apk/res/com.android.launcher"

    android:id="@+id/launcher"
    android:layout_
    android:layout_
    android:background="@drawable/workspace_bg">

    <com.android.launcher2.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:background="@drawable/workspace_bg"
        android:layout_
        android:layout_
        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_
            android:layout_
            android:layout_marginBottom="@dimen/button_bar_height"
            android:layout_gravity="bottom" />

        <include
            android:id="@+id/paged_view_indicator"
            layout="@layout/scroll_indicator"
            android:layout_
            android:layout_
            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_
            android:layout_
            android:paddingLeft="@dimen/workspace_left_padding"
            android:paddingRight="@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>

        <include layout="@layout/hotseat"
            android:id="@+id/hotseat"
            android:layout_
            android:layout_
            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 doesnt overlay on
             top of that view. -->
        <include layout="@layout/workspace_cling"
            android:id="@+id/workspace_cling"
            android:layout_
            android:layout_
            android:visibility="gone" />

        <include layout="@layout/folder_cling"
            android:id="@+id/folder_cling"
            android:layout_
            android:layout_
            android:visibility="gone" />

        <com.android.launcher2.DrawableStateProxyView
            android:id="@+id/voice_button_proxy"
            android:layout_
            android:layout_
            android:layout_gravity="top|right"
            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_
            android:layout_
            android:visibility="invisible" />
    </com.android.launcher2.DragLayer>
</FrameLayout>