From c84d1ab11a5b9d0dc81b673e382e804cc70f35a4 Mon Sep 17 00:00:00 2001
From: Todd Kennedy <toddke@google.com>
Date: Fri, 11 Mar 2016 11:37:17 -0800
Subject: [PATCH] Allow app downgrades

only system apps can do this

Change-Id: If0947f13f5c447f9396690bfda3ad40b07fbbb6b
---
 api/system-current.txt                             | 1 +
 core/java/android/content/pm/PackageInstaller.java | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/api/system-current.txt b/api/system-current.txt
index 8e5b99c4bad5a..cb0c60fb0b2ee 100644
--- a/api/system-current.txt
+++ b/api/system-current.txt
@@ -9929,6 +9929,7 @@ package android.content.pm {
     method public void setAppLabel(java.lang.CharSequence);
     method public void setAppPackageName(java.lang.String);
     method public void setGrantedRuntimePermissions(java.lang.String[]);
+    method public void setInstallFlagsDowngrade();
     method public void setInstallLocation(int);
     method public void setOriginatingUid(int);
     method public void setOriginatingUri(android.net.Uri);
diff --git a/core/java/android/content/pm/PackageInstaller.java b/core/java/android/content/pm/PackageInstaller.java
index ec536e020d042..684a7d86ba5ed 100644
--- a/core/java/android/content/pm/PackageInstaller.java
+++ b/core/java/android/content/pm/PackageInstaller.java
@@ -1051,6 +1051,12 @@ public class PackageInstaller {
             installFlags &= ~PackageManager.INSTALL_EXTERNAL;
         }
 
+        /** {@hide} */
+        @SystemApi
+        public void setInstallFlagsDowngrade() {
+            installFlags |= PackageManager.INSTALL_ALLOW_DOWNGRADE;
+        }
+
         /** {@hide} */
         public void setInstallFlagsExternal() {
             installFlags |= PackageManager.INSTALL_EXTERNAL;