前言

近期接到一个关于谷歌EDLA认证的需求，我负责的是谷歌原生桌面布局的修改，通过研究源码，将涉及到了一些修改思路发出来，大家可以参考一下有没有对你有用的信息。主要修改内容有：

1、搜索栏、底部导航栏未居中
2、中部应用未按要求排布，详情请参考摹客
3、在原生Google桌面未添加中性S-write和投屏Kshare、欢迎页应用

现状图：

参考图：

一、谷歌搜索框的修改

涉及修改的地方有：

1、Launcher3\res\xml\device_profiles.xml

2、com/android/launcher3/Workspace.java

1、首先观察device_profiles.xml代码，一般大屏（平板）设备会加载6*5的布局，手机设备会加载手机的布局，该文件里定义了4个不同的布局类型，如何确定设备加载哪个布局呢？你可以在桌面长按应用图标，然后观察可以移动多少个格子，然后根据行列数找到要修改的布局位置。比如我设备是加载6 * 5布局，我修改这里**launcher:numSearchContainerColumns=“5”**修改谷歌搜索框占据5个格子（横屏总共7个格子）

<--这个行数可以根据自己想要的效果修改，比如我就改了7*6布局,6行7列--/>	<grid-optionlauncher:name="6_by_5"launcher:numRows="6" launcher:numColumns="7"launcher:numSearchContainerColumns="5"launcher:numFolderRows="3"launcher:numFolderColumns="4"launcher:numHotseatIcons="0"launcher:hotseatColumnSpanLandscape="2"launcher:numAllAppsColumns="6"launcher:isScalable="true"launcher:inlineNavButtonsEndSpacing="@dimen/taskbar_button_margin_6_5"launcher:devicePaddingId="@xml/paddings_6x5"launcher:dbFile="launcher_6_by_5.db"launcher:defaultLayoutId="@xml/default_workspace_6x5"launcher:deviceCategory="tablet" ><display-optionlauncher:name="Tablet"launcher:minWidthDps="900"launcher:minHeightDps="820"launcher:minCellHeight="120"launcher:minCellWidth="102"launcher:minCellHeightLandscape="104"launcher:minCellWidthLandscape="120"launcher:iconImageSize="60"launcher:iconTextSize="14"launcher:borderSpaceHorizontal="16"launcher:borderSpaceVertical="64"launcher:borderSpaceLandscapeHorizontal="64"launcher:borderSpaceLandscapeVertical="16"launcher:horizontalMargin="54"launcher:horizontalMarginLandscape="120"launcher:allAppsCellWidth="96"launcher:allAppsCellHeight="142"launcher:allAppsCellWidthLandscape="126"launcher:allAppsCellHeightLandscape="126"launcher:allAppsIconSize="60"launcher:allAppsIconTextSize="14"launcher:allAppsBorderSpaceHorizontal="8"launcher:allAppsBorderSpaceVertical="16"launcher:allAppsBorderSpaceLandscape="16"launcher:hotseatBarBottomSpace="30"launcher:hotseatBarBottomSpaceLandscape="40"launcher:canBeDefault="true" /></grid-option></profiles>

2、谷歌搜索框的位置在workspace.java里面修改，在该类里面查找这个方法：bindAndInitFirstWorkspaceScreen，定位到这里

    public void bindAndInitFirstWorkspaceScreen() {if (!FeatureFlags.QSB_ON_FIRST_SCREEN) {return;}// Add the first pageCellLayout firstPage = insertNewWorkspaceScreen(Workspace.FIRST_SCREEN_ID, getChildCount());// Always add a first page pinned widget on the first screen.if (mFirstPagePinnedItem == null) {// In transposed layout, we add the first page pinned widget in the Grid.// As workspace does not touch the edges, we do not need a full// width first page pinned widget.mFirstPagePinnedItem = LayoutInflater.from(getContext()).inflate(R.layout.search_container_workspace, firstPage, false);}int cellHSpan = mLauncher.getDeviceProfile().inv.numSearchContainerColumns;//格子数从0开始算，这里表示搜索框位置从X轴第2格子，y轴第3个格子算起，x轴占据5(cellHSpan)个格子，y轴占据1个格子CellLayoutLayoutParams lp = new CellLayoutLayoutParams(1, 2, cellHSpan, 1, FIRST_SCREEN_ID);lp.canReorder = false;if (!firstPage.addViewToCellLayout(mFirstPagePinnedItem, 0, R.id.search_container_workspace, lp, true)) {Log.e(TAG, "Failed to add to item at (0, 0) to CellLayout");mFirstPagePinnedItem = null;}}

提示：如果一开始桌面没有谷歌搜索框，可以使用微件的形式添加，添加微件这里又分为两种情况，具体使用哪种方式得看系统有没有去读取配置文件，没有的话就使用第一种，一种是直接在布局文件里面添加，比如res/xml/default_workspace_6x5.xml里面添加：

<appwidgetcontainer="-100"screen="0"x="1"y="2"spanX="5"spanY="1"packageName="com.google.android.googlequicksearchbox"className="com.google.android.googlequicksearchbox.SearchWidgetProvider"/>

另外一种方式是在google_gms包下的配置文件里面添加：release\vendor\partner_gms\apps\GmsSampleIntegration\res_dhs_full\xml\partner_default_layout.xml，例如

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2017 Google Inc. All Rights Reserved. -->
<favorites><!-- Hotseat (We use the screen as the position of the item in the hotseat) --><!-- Dialer Messaging Calendar Contacts Camera --><!--<favorite container="-101" screen="0" x="0" y="0" packageName="com.google.android.dialer" className="com.google.android.dialer.extensions.GoogleDialtactsActivity"/>--><!--<favorite container="-101" screen="1" x="1" y="0" packageName="com.google.android.apps.messaging" className="com.google.android.apps.messaging.ui.ConversationListActivity"/>--><!-- <favorite container="-101" screen="0" x="0" y="0" packageName="com.android.settings" className="com.android.settings.Settings"/> --><!-- <favorite container="-101" screen="1" x="1" y="0" packageName="com.android.deskclock" className="com.android.deskclock.DeskClock"/> --><!-- <favorite container="-101" screen="2" x="2" y="0" packageName="com.google.android.calendar" className="com.android.calendar.event.LaunchInfoActivity"/> --><!-- <favorite container="-101" screen="3" x="3" y="0" packageName="com.google.android.contacts" className="com.android.contacts.activities.PeopleActivity"/> --><!-- <favorite container="-101" screen="4" x="4" y="0" packageName="com.android.camera2" className="com.android.camera.CameraLauncher"/> --><!-- In Launcher3, workspaces extend infinitely to the right, incrementing from zero --><!-- Google folder --><!-- Google, Chrome, Gmail, Maps, YouTube, (Drive), (Music), (Movies), Duo, Photos --><folder title="@string/google_folder_title" screen="0" x="1" y="3"><favorite packageName="com.google.android.googlequicksearchbox" className="com.google.android.googlequicksearchbox.SearchActivity"/><favorite packageName="com.android.chrome" className="com.google.android.apps.chrome.Main"/><favorite packageName="com.google.android.gm" className="com.google.android.gm.ConversationListActivityGmail"/><favorite packageName="com.google.android.apps.maps" className="com.google.android.maps.MapsActivity"/><favorite packageName="com.google.android.youtube" className="com.google.android.youtube.app.honeycomb.Shell$HomeActivity"/><favorite packageName="com.google.android.apps.docs" className="com.google.android.apps.docs.app.NewMainProxyActivity"/><favorite packageName="com.google.android.apps.youtube.music" className="com.google.android.apps.youtube.music.activities.MusicActivity"/><favorite packageName="com.google.android.videos" className="com.google.android.videos.GoogleTvEntryPoint"/><favorite packageName="com.google.android.apps.tachyon" className="com.google.android.apps.tachyon.MainActivity"/><favorite packageName="com.google.android.apps.photos" className="com.google.android.apps.photos.home.HomeActivity"/></folder><favorite screen="0" x="5" y="3" packageName="com.android.vending" className="com.android.vending.AssetBrowserActivity"/><appwidget screen="0" x="2" y="0" packageName="com.android.deskclock" className="com.android.alarmclock.DigitalAppWidgetProvider" spanX="3" spanY="2" /><appwidget screen="0" x="1" y="2" packageName="com.google.android.googlequicksearchbox" className="com.google.android.googlequicksearchbox.SearchWidgetProvider" spanX="5" spanY="1" />
</favorites>

om.google.android.googlequicksearchbox" className=“com.google.android.googlequicksearchbox.SearchWidgetProvider” spanX=“5” spanY=“1” />

注释掉的内容是定义桌面的hotSeat显示的应用，其中，添加小部件使用的是appwidget标签，桌面时钟就可以这样添加，folder标签定义的是一个桌面文件夹，里面可以定义文件夹要存放的应用。待更新.....
![在这里插入图片描述](https://img-blog.csdnimg.cn/img_convert/6afe347ccb1ab6237537160c0744baba.png#pic_center)