修改步骤与Android11是差不多的，只是有部分代码所在位置不一样。
Android 11®内置APP到data/app
Android 8(O)预置APP到data/app

默认内置应用到data会出错

1970-01-01 08:03:54.499 1177-1177/system_process I/PackageManager: /data/app/xx changed; collecting certs
1970-01-01 08:03:54.547 1177-1177/system_process W/PackageManager: Failed to scan /data/app/xx: Application package com.benew.ntt.cloud not found; ignoring.
1970-01-01 08:03:54.547 1177-1177/system_process W/PackageManager: Deleting invalid package at /data/app/xx

userdata.img只有几十k的问题

往data中加了几百M大小的app，在out/xx/data/app中也看到编译出来了，
但是编译后却发现userdata.img只有90k，是空的分区，
在.mk中修改userdata分区大小，.mk里面默认是64M， 改成512M解决了。

diff --git a/device/sprd/mpool/module/generic/partition/main.mk b/device/sprd/mpool/module/generic/partition/main.mk
index 37b0b79d0e9..d2f2322d6b3 100755
--- a/device/sprd/mpool/module/generic/partition/main.mk
+++ b/device/sprd/mpool/module/generic/partition/main.mk
@@ -25,8 +25,8 @@ endif$(call md-set, BOARD_BOOTIMAGE_PARTITION_SIZE, 67108864)$(call md-set, BOARD_CACHEIMAGE_PARTITION_SIZE, 67108864)-# default value is 64M, using resize to adapter real size
-BOARD_USERDATAIMAGE_PARTITION_SIZE ?= 67108864
+# default value is 512M, using resize to adapter real size
+BOARD_USERDATAIMAGE_PARTITION_SIZE ?= 536870912

实现

Android11中修改的是
frameworks/base/services/core/java/com/android/server/pm/PackageManagerService.java

Android 13不同，需要修改
frameworks/base/services/core/java/com/android/server/pm/InstallPackageHelper.java
注释掉

else {throw new PackageManagerException(INSTALL_FAILED_INVALID_INSTALL_LOCATION,"Application package " + pkg.getPackageName()+ " not found; ignoring.");}

完整代码如下

            if ((scanFlags & SCAN_REQUIRE_KNOWN) != 0) {if (mPm.isExpectingBetter(pkg.getPackageName())) {Slog.w(TAG, "Relax SCAN_REQUIRE_KNOWN requirement for package "+ pkg.getPackageName());} else {PackageSetting known = mPm.mSettings.getPackageLPr(pkg.getPackageName());if (known != null) {if (DEBUG_PACKAGE_SCANNING) {Log.d(TAG, "Examining " + pkg.getPath()+ " and requiring known path " + known.getPathString());}if (!pkg.getPath().equals(known.getPathString())) {throw new PackageManagerException(INSTALL_FAILED_PACKAGE_CHANGED,"Application package " + pkg.getPackageName()+ " found at " + pkg.getPath()+ " but expected at " + known.getPathString()+ "; ignoring.");}} /*else {throw new PackageManagerException(INSTALL_FAILED_INVALID_INSTALL_LOCATION,"Application package " + pkg.getPackageName()+ " not found; ignoring.");}*/}}

diff --git a/system/core/init/util.cpp b/system/core/init/util.cpp
index d1e518b5795..bee7a8bb70d 100644
--- a/system/core/init/util.cpp
+++ b/system/core/init/util.cpp
@@ -485,7 +485,7 @@ static FscryptAction FscryptInferAction(const std::string& dir) {std::vector<std::string> directories_to_exclude = {"lost+found", "system_ce", "system_de", "misc_ce",     "misc_de","vendor_ce",  "vendor_de", "media",     "data",        "user",
-            "user_de",    "apex",      "preloads",  "app-staging", "gsi",
+            "user_de",    "apex",      "preloads",  "app-staging", "gsi", "app",};for (const auto& d : directories_to_exclude) {if ((prefix + d) == dir) {
diff --git a/system/core/rootdir/init.rc b/system/core/rootdir/init.rc
index 405667cf8df..1a8bc1215eb 100644
--- a/system/core/rootdir/init.rc
+++ b/system/core/rootdir/init.rc
@@ -853,7 +853,7 @@ on post-fs-datamkdir /data/app-ephemeral 0771 system system encryption=Requiremkdir /data/app-asec 0700 root root encryption=Requiremkdir /data/app-lib 0771 system system encryption=Require
-    mkdir /data/app 0771 system system encryption=Require
+    mkdir /data/app 0771 system system encryption=Nonemkdir /data/property 0700 root root encryption=Require# create directory for updated font files.

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