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一、前言

应用双开简单说就是创建一个用户然后将已经存在的APP安装到制定的userId中，下面新建一个系统应用来实现功能。

二、系统APP

首先要调整最大用户数量这个再framework/base/core/res/res/values/config.xml下面

    <!--  Maximum number of supported users --><integer name="config_multiuserMaximumUsers">1</integer>

但是LineageOS已经用overlay的方式配置过了，最大是支持4个用户，所以这里不需要调整。直接下一步制作系统应用。

清单文件，权限，以及sharedUserId配置如下

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:sharedUserId="android.uid.system"><uses-permission android:name="android.permission.DELETE_PACKAGES" /><uses-permission android:name="android.permission.MANAGE_USERS"/><uses-permission android:name="android.permission.CREATE_USERS"/><uses-permission android:name="android.permission.INTERACT_ACROSS_USERS_FULL"/><uses-permission android:name="android.permission.INSTALL_EXISTING_PACKAGES"/><uses-permission android:name="android.permission.INSTALL_PACKAGES"/><uses-permission android:name="com.android.permission.INSTALL_EXISTING_PACKAGES" /><applicationandroid:allowBackup="true"android:dataExtractionRules="@xml/data_extraction_rules"android:fullBackupContent="@xml/backup_rules"android:icon="@mipmap/ic_launcher"android:label="@string/app_name"android:roundIcon="@mipmap/ic_launcher_round"android:supportsRtl="true"android:theme="@style/Theme.MyApplication"><activityandroid:name="com.example.split.MainActivity"android:exported="true"android:label="@string/app_name"android:theme="@style/Theme.MyApplication"><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity></application></manifest>

MainActivity.kt

package com.example.splitimport android.app.ActivityManager
import android.app.ActivityThread
import android.app.IActivityManager
import android.content.pm.LauncherApps
import android.content.pm.PackageInfo
import android.content.pm.PackageInstaller
import android.content.pm.PackageManager
import android.content.pm.PackageManager.MATCH_ANY_USER
import android.content.pm.UserInfo
import android.os.Build
import android.os.Bundle
import android.os.UserHandle
import android.os.UserManager
import android.util.DisplayMetrics
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.activity.enableEdgeToEdge
import androidx.annotation.RequiresApi
import androidx.compose.foundation.Image
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.material3.CircularProgressIndicator
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Switch
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.MutableState
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.rememberCoroutineScope
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.painterResource
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
import com.android.internal.R.string.loading
import com.example.split.ui.theme.MyApplicationTheme
import com.example.splite.R
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launchprivate const val targetPackage = "com.example.cloudclient"private const val testUserName = "testUserName"class MainActivity : ComponentActivity() {val metrics = DisplayMetrics()var createUserId:Int=-1@RequiresApi(Build.VERSION_CODES.S)override fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)windowManager.defaultDisplay.getMetrics(metrics)enableEdgeToEdge()val launcherApps=LauncherApps(this)setContent {val scope = rememberCoroutineScope()MyApplicationTheme {Scaffold(modifier = Modifier.fillMaxSize()) { innerPadding ->Box(Modifier.fillMaxSize().padding(innerPadding)){var checked = remember {val userManager=UserManager.get(this@MainActivity)val userInfoList: List<UserInfo> = userManager.userscreateUserId=userInfoList.find {it.name== testUserName}?.id?:-1val packageManager = ActivityThread.getPackageManager();val slices=packageManager.getInstalledPackages(MATCH_ANY_USER.toLong(),createUserId?:-1)val installed=slices.list.find {if(it is PackageInfo){it.packageName==targetPackage}else{false}}!=nullmutableStateOf(installed)}var loading= remember {mutableStateOf(false)}val scope = rememberCoroutineScope()Column {Row (Modifier.fillMaxWidth().padding(20.dp), verticalAlignment = Alignment.CenterVertically){Box(Modifier.weight(1f)){Image(modifier = Modifier.size(50.dp),painter = painterResource(R.mipmap.scrrr),contentDescription = "e")}Switch(checked.value,{if(it){scope.launch (Dispatchers.Default){loading.value=truecreateUser()startBackground(createUserId)installToUserId(createUserId,checked)loading.value=false}}else{scope.launch (Dispatchers.Default){loading.value=trueuninstallToUserId(createUserId,checked)loading.value=false}}})}if(loading.value){CircularProgressIndicator(modifier = Modifier.align(alignment = Alignment.CenterHorizontally).size(60.dp))}}}}}}}@RequiresApi(Build.VERSION_CODES.S)private fun uninstallToUserId(userId: Int, checked: MutableState<Boolean>) {val packageManager = ActivityThread.getPackageManager();try {val packageInstaller =  PackageInstaller(packageManager.packageInstaller,packageName,null,userId)packageInstaller.uninstallExistingPackage(targetPackage,null);checked.value=false}catch ( e:Exception){e.printStackTrace();}}fun createUser(){val userManager=UserManager.get(this)val userInfoList: List<UserInfo> = userManager.usersvar isCreated = falsefor (userInfo in userInfoList) {if (testUserName == userInfo.name) {isCreated = truecreateUserId = userInfo.idbreak}}if (!isCreated) {val userHandle: UserHandle = userManager.createProfile(testUserName,UserManager.USER_TYPE_PROFILE_MANAGED,HashSet<String>())!!createUserId = userHandle.identifier}}fun startBackground(userId:Int){//后台启动userIdval  am: IActivityManager = ActivityManager.getService();try {am.startUserInBackground(userId);} catch ( e:Exception) {e.printStackTrace()}}@RequiresApi(Build.VERSION_CODES.Q)fun installToUserId(userId: Int, checked: MutableState<Boolean>){val packageManager = ActivityThread.getPackageManager();try {val packageInstaller =  PackageInstaller(packageManager.packageInstaller,packageName,null,userId)packageInstaller.installExistingPackage(targetPackage,PackageManager.INSTALL_REASON_USER,null);checked.value=true}catch ( e:Exception){e.printStackTrace();}}
}@Preview(showBackground = true)
@Composable
fun GreetingPreview() {MyApplicationTheme {}
}

步骤还是比较清晰，这里我只对某个已经安装的自己的App做双开：
1.进入双开应用的时候检查是否已经安装到指定用户，如果已经安装就配置UI的switch
2.switch切换的时候安装，总共三步
2.1 创建user并获取userid
2.2 启动user
2.3 将制定包名的app安装到对应的userid
3.切换回来的时候进行卸载应用

Lineageos的桌面支持两

❯ adb shell ps -A | grep cloud
u13_a236 9858 24619 14622780 122908 SyS_epoll_wait 0 S com.example.cloudclient
u0_a236 10199 24619 14672596 133628 SyS_epoll_wait 0 S com.example.cloudclient