Android应用程序升级在技术上是如何工作的？

Question

有人能解释或指出我可以阅读的资源吗? Android应用程序升级实际上是如何在操作系统层面上进行详细工作的？

Answer 1

从包管理器日志来看，似乎采取了以下步骤进行升级：

1)在临时位置下载包。

应用程序包类型file:///data/app/vmdl1854135520.tmp=

/vnd.android.package-dat=

2)做套餐验证。

06-30 17:59:02.751 3701 3751 D PackageManager: MSG PACKAGE_VERIFIED:观察者{237546897}

3)重命名包。

06-30 17:59:03.361 3701 3751 D PackageManager:将/data/app/vmdl1854135520.tmp重命名为/data/app/com.vzw.hss.myverizon-1

4)终止现有应用程序

06-30 17:59:03.361 3701 3751 D PackageManager：！@3701应用程序: 10031，更换系统包

5) Dexopt the apk

06-30 17:59:03.381 3701 3751 D PackageManager:在以下位置运行：/data/app/com.vzw.hss.myverizon-1/base.apk pkg=com.vzw.hss.myverizon isa=arm64 vmSafeMode=false interpret_only=false

**06-30 17:59:02.741  3701  3751 D PackageManager: [VERIFY] Found 1 verifiers for intent Intent { act=android.intent.action.PACKAGE_NEEDS_VERIFICATION dat=file:///data/app/vmdl1854135520.tmp** typ=application/vnd.android.package-archive flg=0x10000001 } with 0 optional verifiers
06-30 17:59:02.741  3701  3751 D PackageManager: [VERIFY] sendOrderedBroadcastToRequiredVerifier:
06-30 17:59:02.741  3701  3751 D PackageManager: PackageVerificationState{
06-30 17:59:02.741  3701  3751 D PackageManager:     verifier packages=com.android.vending(10034),
06-30 17:59:02.741  3701  3751 D PackageManager:     intent=Intent { act=android.intent.action.PACKAGE_NEEDS_VERIFICATION dat=file:///data/app/vmdl1854135520.tmp typ=application/vnd.android.package-archive flg=0x10000001 (has extras) }
06-30 17:59:02.741  3701  3751 D PackageManager:     others=28, false, false, false, false, false
06-30 17:59:02.741  3701  3751 D PackageManager: }
06-30 17:59:02.741  3701  3751 D PackageManager: remove MCS_UNBIND message and Posting MCS_UNBIND 10 secs later
06-30 17:59:02.751  3701  3701 D PackageManager: [VERIFY] onReceive for RequiredVerifier id=28
06-30 17:59:02.751  3701  3701 D PackageManager: [VERIFY] send delayed message for CHECK_PENDING_VERIFICATION after : 10000
06-30 17:59:02.751  3701  4589 D PackageManager: [VERIFY] verifyPendingInstall(28, VERIFICATION_ALLOW), uid=10034
06-30 17:59:02.751  3701  3751 D PackageManager: [MSG] PACKAGE_VERIFIED: observer{237546897}
06-30 17:59:02.751  3701  3751 D PackageManager: [VERIFY] PACKAGE_VERIFIED: 
06-30 17:59:02.751  3701  3751 D PackageManager: PackageVerificationState{
06-30 17:59:02.751  3701  3751 D PackageManager:     verifier packages=com.android.vending(10034),
06-30 17:59:02.751  3701  3751 D PackageManager:     intent=Intent { act=android.intent.action.PACKAGE_NEEDS_VERIFICATION dat=file:///data/app/vmdl1854135520.tmp typ=application/vnd.android.package-archive flg=0x10000001 cmp=com.android.vending/com.google.android.vending.verifier.PackageVerificationReceiver (has extras) }
06-30 17:59:02.751  3701  3751 D PackageManager:     others=28, false, false, false, false, false
06-30 17:59:02.751  3701  3751 D PackageManager: }
06-30 17:59:02.751  3701  3751 D PackageManager: [VERIFY] broadcastPackageVerified(28, VERIFICATION_ALLOW, file:///data/app/vmdl1854135520.tmp)
06-30 17:59:02.761  3701  3751 D PackageManager: /data/app/vmdl1854135520.tmp already staged; skipping copy
06-30 17:59:02.761  3701  3751 D PackageManager: remove MCS_UNBIND and Posting MCS_UNBIND
06-30 17:59:02.761  3701  3751 D PackageManager: [MSG] PROCESS_PENDING_INSTALL: observer{237546897}
06-30 17:59:02.761  3701  3751 D PackageManager: currentStatus{1}
06-30 17:59:02.761  3701  3751 D PackageManager: installPackageLI: path
06-30 17:59:03.321  3701  3751 W PackageManager: verifying app can be installed or not
**06-30 17:59:03.361  3701  3751 D PackageManager: Renaming /data/app/vmdl1854135520.tmp to /data/app/com.vzw.hss.myverizon-1**
**06-30 17:59:03.361  3701  3751 D PackageManager: replacePackageLI**
**06-30 17:59:03.361  3701  3751 D PackageManager: !@killApplicatoin: 10031, replace sys pkg**
06-30 17:59:03.371  3701  3751 W PackageManager: Trying to update system app code path from /system/priv-app/MyVerizon to /data/app/com.vzw.hss.myverizon-1
06-30 17:59:03.371  3701  3751 I PackageManager: scanFileNewer : com.vzw.hss.myverizon
**06-30 17:59:03.381  3701  3751 D PackageManager: Running dexopt on: /data/app/com.vzw.hss.myverizon-1/base.apk pkg=com.vzw.hss.myverizon isa=arm64 vmSafeMode=false interpret_only=false**
06-30 17:59:06.861  3701  3751 I PackageManager: do mInstaller.dexopt : 0
06-30 17:59:06.861  3701  3751 D PackageManager: Time to dexopt: 3.482 seconds
06-30 17:59:06.861  3701  3751 D PackageManager: !@killApplicatoin: 10031, update pkg
06-30 17:59:06.861  3701  3751 W PackageManager: Code path for pkg : com.vzw.hss.myverizon changing from /system/priv-app/MyVerizon to /data/app/com.vzw.hss.myverizon-1
06-30 17:59:06.861  3701  3751 W PackageManager: Resource path for pkg : com.vzw.hss.myverizon changing from /system/priv-app/MyVerizon to /data/app/com.vzw.hss.myverizon-1
06-30 17:59:06.961  3701  3751 D PackageManager: New package installed
06-30 17:59:06.971  3701  3751 I PackageManager: Un-granting permission android.permission.sec.ENTERPRISE_DEVICE_ADMIN from package com.samsung.mdmtest1 (protectionLevel=2 flags=0x89be44)
06-30 17:59:06.971  3701  3751 I PackageManager: Un-granting permission com.sec.enterprise.knox.permission.KNOX_ENTERPRISE_BILLING from package com.samsung.mdmtest1 (protectionLevel=2 flags=0x89be44)
06-30 17:59:07.141  3701  3751 D PackageManager: doPostInstall for uid{10031}
06-30 17:59:07.151  3701  3751 D PackageManager: [MSG] MCS_UNBIND
06-30 17:59:07.151  3701  3751 D PackageManager: [MSG] POST_INSTALL: observer{237546897}
06-30 17:59:07.151  3701  3751 D PackageManager:           Handling post-install for 29
06-30 17:59:07.661  3701  3751 D PackageManager: result of install: 1{237546897}

Answer 2

我找不到一个好的资源，但这是我对这个过程的理解。

APK在安装时存储在电话上的私有目录中。当升级发生时，从商店下载新的APK，然后用新的APK替换旧的APK。新的AndroidManifest被解析并安装，就像它是新安装的一样，并检查版本、签名密钥等，以确保允许升级。实际的应用程序数据存储在单独的位置，并且在升级过程中不会受到影响。如果您更改了数据库架构或其他内容，则需要在第一次启动时迁移数据。

Answer 3

来源：http://java.dzone.com/articles/depth-android-package-manager

我不太确定这是否是你想要的，但我能找到的最好的就是这个。

Package Manager API负责管理APK文件的安装、卸载和升级。

它使用'uri‘、'installFlags’、'observer‘和'InstallPackageName’参数调用"InstallPackage“方法，然后启动名为"package”的服务，该服务将实际安装/升级它。

包管理器服务在system_service进程中运行，安装守护进程(installd)作为本机进程运行。两者都在系统启动时启动。

流程概述：

安装程序包到安装队列中安装程序包的适当位置安装安装/更新新的数据将APK文件复制到给定的安装程序中应用程序的UID；

• Waiting;
• Add请求安装守护程序process;
• Create应用程序目录并将permissions;
• Extraction of dex代码设置为缓存directory;
• Reflect packages.list /system /

/ packages.xml最新的程序包状态；如果软件包是新的，则

• 会连同软件包的名称一起向系统广播更新的效果// ( Intent.ACTION_PACKAGE_REPLACED)如果软件包已更新

​

包管理器将应用程序信息存储在/data/system中的三个文件中：

1. packages.xml -具有属于package
2. packages.list的权限-它只是包含包名、用户id、标志和数据directory
3. packages-stopped.xml的文本文件:此文件包含已停止状态的包列表。已停止状态应用程序无法接收任何广播。

包管理器(和包安装程序)的相关源代码链接如下：

包管理器 https://android.googlesource.com/platform/frameworks/base/+/483f3b06ea84440a082e21b68ec2c2e54046f5a6/services/java/com/android/server/pm/Settings.java

https://android.googlesource.com/platform/frameworks/base/+/483f3b06ea84440a082e21b68ec2c2e54046f5a6/services/java/com/android/server/pm/PackageManagerService.java

https://android.googlesource.com/platform/frameworks/base/+/483f3b06ea84440a082e21b68ec2c2e54046f5a6/core/java/android/content/pm/IPackageManager.aidl

https://android.googlesource.com/platform/frameworks/base/+/483f3b06ea84440a082e21b68ec2c2e54046f5a6/services/java/com/android/server/pm/PackageSignatures.java

https://android.googlesource.com/platform/frameworks/base/+/483f3b06ea84440a082e21b68ec2c2e54046f5a6/services/java/com/android/server/pm/PreferredActivity.java

https://android.googlesource.com/platform/frameworks/base/+/483f3b06ea84440a082e21b68ec2c2e54046f5a6/services/java/com/android/server/PreferredComponent.java

https://android.googlesource.com/platform/frameworks/base/+/483f3b06ea84440a082e21b68ec2c2e54046f5a6/core/java/android/content/IntentFilter.java

https://android.googlesource.com/platform/frameworks/base/+/483f3b06ea84440a082e21b68ec2c2e54046f5a6/core/java/android/content/pm/PackageParser.java

https://android.googlesource.com/platform/frameworks/base/+/483f3b06ea84440a082e21b68ec2c2e54046f5a6/core/java/android/content/pm/IPackageManager.aidl

https://android.googlesource.com/platform/frameworks/base/+/483f3b06ea84440a082e21b68ec2c2e54046f5a6/services/java/com/android/server/pm/Installer.java

https://android.googlesource.com/platform/frameworks/base/+/483f3b06ea84440a082e21b68ec2c2e54046f5a6/core/java/com/android/internal/app/IMediaContainerService.aidl

https://android.googlesource.com/platform/frameworks/base/+/483f3b06ea84440a082e21b68ec2c2e54046f5a6/packages/DefaultContainerService/src/com/android/defcontainer/DefaultContainerService.java

包安装程序

https://android.googlesource.com/platform/packages/apps/PackageInstaller/+/47fe118e0178e9d72c98073ff588ee5cf353258e/src/com/android/packageinstaller/PackageInstallerActivity.java

https://android.googlesource.com/platform/packages/apps/PackageInstaller/+/47fe118e0178e9d72c98073ff588ee5cf353258e/src/com/android/packageinstaller/PackageUtil.java

https://android.googlesource.com/platform/packages/apps/PackageInstaller/+/47fe118e0178e9d72c98073ff588ee5cf353258e/src/com/android/packageinstaller/InstallAppProgress.java