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一、前言

Launcer的初始化配置主要在如下的xml文件夹下，默认读取的5x5

这里我们把device_profiles调整一下，然后新建一个default_workspace_my.xml作为我们自己的配置就行。

二、配置

注意Lineageos 的Launcer是在lineageos/packages/apps/Trebuchet这个目录下面，和原生aosp有点差别。
简单调整
device_profiles.xml，

 <grid-optionlauncher:name="5_by_5"launcher:numRows="5"launcher:numColumns="6"launcher:numFolderRows="4"launcher:numFolderColumns="4"launcher:numHotseatIcons="5"launcher:numExtendedHotseatIcons="6"launcher:dbFile="launcher.db"launcher:inlineNavButtonsEndSpacing="@dimen/taskbar_button_margin_split"launcher:defaultLayoutId="@xml/default_workspace_my"launcher:deviceCategory="phone|multi_display" ><display-optionlauncher:name="Large Phone"launcher:minWidthDps="406"launcher:minHeightDps="694"launcher:iconImageSize="56"launcher:iconTextSize="12.0"launcher:allAppsBorderSpace="16"launcher:allAppsCellHeight="104"launcher:canBeDefault="true" /><display-optionlauncher:name="Large Phone Split Display"launcher:minWidthDps="406"launcher:minHeightDps="694"launcher:iconImageSize="56"launcher:iconTextSize="12.0"launcher:allAppsBorderSpace="16"launcher:allAppsCellHeight="104"launcher:canBeDefault="true" /><display-optionlauncher:name="Shorter Stubby"launcher:minWidthDps="255"launcher:minHeightDps="400"launcher:iconImageSize="48"launcher:iconTextSize="12.0"launcher:allAppsBorderSpace="16"launcher:allAppsCellHeight="104"launcher:canBeDefault="true" /></grid-option>

就调整了两行代码

  launcher:numColumns="6"launcher:defaultLayoutId="@xml/default_workspace_my"

然后是 default_workspace_my.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2009 The Android Open Source ProjectLicensed 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 athttp://www.apache.org/licenses/LICENSE-2.0Unless required by applicable law or agreed to in writing, softwaredistributed 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 andlimitations under the License.
--><favorites xmlns:launcher="http://schemas.android.com/apk/res-auto/com.android.launcher3"><!-- Hotseat (We use the screen as the position of the item in the hotseat) --><!-- Dialer, Messaging, Contacts, Browser, Camera --><resolvelauncher:container="-101"launcher:screen="0"launcher:x="0"launcher:y="0" ><favorite launcher:uri="#Intent;action=android.intent.action.DIAL;end" /><favorite launcher:uri="tel:123" /><favorite launcher:uri="#Intent;action=android.intent.action.CALL_BUTTON;end" /></resolve><resolvelauncher:container="-101"launcher:screen="1"launcher:x="1"launcher:y="0" ><favorite launcher:uri="#Intent;action=android.intent.action.MAIN;category=android.intent.category.APP_MESSAGING;end" /><favorite launcher:uri="sms:" /><favorite launcher:uri="smsto:" /><favorite launcher:uri="mms:" /><favorite launcher:uri="mmsto:" /></resolve><resolvelauncher:container="-101"launcher:screen="2"launcher:x="2"launcher:y="0" ><favorite launcher:uri="#Intent;action=android.intent.action.MAIN;category=android.intent.category.APP_CONTACTS;end" /></resolve><resolvelauncher:container="-101"launcher:screen="3"launcher:x="3"launcher:y="0" ><favorite launcher:uri="#Intent;action=android.intent.action.MAIN;category=android.intent.category.APP_BROWSER;end" /><favorite launcher:uri="http://www.example.com/" /></resolve><resolvelauncher:container="-101"launcher:screen="4"launcher:x="4"launcher:y="0" ><favorite launcher:uri="#Intent;action=android.media.action.STILL_IMAGE_CAMERA;end" /><favorite launcher:uri="#Intent;action=android.intent.action.CAMERA_BUTTON;end" /></resolve><!-- Screen 0 -->
<!--    <appwidget-->
<!--        launcher:packageName="com.google.android.googlequicksearchbox"-->
<!--        launcher:className="com.google.android.googlequicksearchbox.SearchWidgetProvider"-->
<!--        launcher:screen="0"-->
<!--        launcher:x="0"-->
<!--        launcher:y="0"-->
<!--        launcher:spanX="5"-->
<!--        launcher:spanY="1" />--><appwidgetlauncher:packageName="com.android.deskclock"launcher:className="com.android.alarmclock.DigitalAppWidgetProvider"launcher:screen="0"launcher:x="0"launcher:y="1"launcher:spanX="6"launcher:spanY="2" /><!-- Google Folder --><!-- Google, Gmail, Maps, YouTube, Drive, YouTube Music, Play Movies, Duo, Photos --><folderlauncher:title="@string/google_folder_title"launcher:screen="0"launcher:x="0"launcher:y="4"><favoritelauncher:packageName="com.google.android.googlequicksearchbox"launcher:className="com.google.android.googlequicksearchbox.SearchActivity"/><favoritelauncher:packageName="com.google.android.gm"launcher:className="com.google.android.gm.ConversationListActivityGmail"/><favoritelauncher:packageName="com.google.android.apps.maps"launcher:className="com.google.android.maps.MapsActivity"/><favoritelauncher:packageName="com.google.android.youtube"launcher:className="com.google.android.youtube.app.honeycomb.Shell$HomeActivity"/><favoritelauncher:packageName="com.google.android.apps.docs"launcher:className="com.google.android.apps.docs.app.NewMainProxyActivity"/><favoritelauncher:packageName="com.google.android.apps.youtube.music"launcher:className="com.google.android.apps.youtube.music.activities.MusicActivity"/><favoritelauncher:packageName="com.google.android.videos"launcher:className="com.google.android.youtube.videos.EntryPoint"/><favoritelauncher:packageName="com.google.android.apps.tachyon"launcher:className="com.google.android.apps.tachyon.MainActivity"/><favoritelauncher:packageName="com.google.android.apps.photos"launcher:className="com.google.android.apps.photos.home.HomeActivity"/></folder><favoritelauncher:screen="0"launcher:x="4"launcher:y="4"launcher:packageName="com.android.vending"launcher:className="com.android.vending.AssetBrowserActivity"/><!-- Screen 1 -->
<!--    <appwidget-->
<!--        launcher:packageName="org.lineageos.twelve"-->
<!--        launcher:className="org.lineageos.twelve.ui.widgets.NowPlayingAppWidgetProvider"-->
<!--        launcher:screen="1"-->
<!--        launcher:x="0"-->
<!--        launcher:y="0"-->
<!--        launcher:spanX="5"-->
<!--        launcher:spanY="1" />--><resolvelauncher:screen="1"launcher:x="0"launcher:y="-1" ><favorite launcher:uri="#Intent;action=android.intent.action.MAIN;category=android.intent.category.APP_EMAIL;end" /><favorite launcher:uri="mailto:" /></resolve><resolvelauncher:screen="1"launcher:x="1"launcher:y="-1" ><favorite launcher:uri="#Intent;action=android.intent.action.MAIN;category=android.intent.category.APP_GALLERY;end" /><favorite launcher:uri="#Intent;type=images/*;end" /></resolve><favoritelauncher:packageName="org.lineageos.twelve"launcher:className="org.lineageos.twelve.MainActivity"launcher:screen="1"launcher:x="2"launcher:y="-1" /><favoritelauncher:packageName="com.android.settings"launcher:className="com.android.settings.Settings"launcher:screen="1"launcher:x="3"launcher:y="-1" /></favorites>

这里也调整了几个地方，把时钟弄成了6x2，然后移除了第二屏的音乐widget。
最后我们编译一下

make -j13 TrebuchetQuickStep  

这里更新直接安装apk就行，但是因为Launcer只有第一次会读取xml并保存到数据库，所以要删除db

adb root;adb remount
adb shell rm /data/data/com.android.launcher3/databases/launcher.db
adb reboot

重启后第二屏幕的music没有了，然后列数也变成了6列。