关于android8.1实现多个app升级时的注意事项

android新的版本，packagemanager对app安装有一定的限制，就是除了shell和root用户外，其他用户的进程不允许安装除了系统用户（system ui）以外的app。也就是例如system用户不允许安装uid为7000的app。

所以，如果你想通过一个appupgrade（一个system用户的进程）专门去进行多个不用用户的应用进行差分升级，那么需要去掉此限制。

修改如下：

diff --git a/frameworks/base/services/core/java/com/android/server/pm/PackageInstallerService.java b/frameworks/base/services/core/java/com/android/server/pm/PackageInstallerService.java

index 94f7577..53eea02 100644--- a/frameworks/base/services/core/java/com/android/server/pm/PackageInstallerService.java+++ b/frameworks/base/services/core/java/com/android/server/pm/PackageInstallerService.java@@ -438,7 +438,7 @@ public class PackageInstallerService extends IPackageInstaller.Stub { throw new SecurityException("User restriction prevents installing");}

• if ((callingUid == Process.SHELL_UID) || (callingUid == Process.ROOT_UID)) {

• if ((callingUid == Process.SHELL_UID) || (callingUid == Process.ROOT_UID) || (callingUid == Process.SYSTEM_UID)) {

  params.installFlags |= PackageManager.INSTALL_FROM_ADB;

  } else {

  @@ -737,7 +737,7 @@ public class PackageInstallerService extends IPackageInstaller.Stub {

  IntentSender statusReceiver, int userId) throws RemoteException {
  final int callingUid = Binder.getCallingUid();
  mPm.enforceCrossUserPermission(callingUid, userId, true, true, "uninstall");

• if ((callingUid != Process.SHELL_UID) && (callingUid != Process.ROOT_UID)) {
• if ((callingUid != Process.SHELL_UID) && (callingUid != Process.ROOT_UID) && (callingUid != Process.SYSTEM_UID)) {
  mAppOps.checkPackage(callingUid, callerPackageName);
  }

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