diff --git a/core/java/android/app/ActivityManagerInternal.java b/core/java/android/app/ActivityManagerInternal.java
index ca7e704f1c1e4..45ed6f2730681 100644
--- a/core/java/android/app/ActivityManagerInternal.java
+++ b/core/java/android/app/ActivityManagerInternal.java
@@ -208,6 +208,12 @@ public abstract class ActivityManagerInternal {
      */
     public abstract void notifyNetworkPolicyRulesUpdated(int uid, long procStateSeq);
 
+    /**
+     * Inform ActivityManagerService about the latest {@code blockedReasons} for an uid, which
+     * can be used to understand whether the {@code uid} is allowed to access network or not.
+     */
+    public abstract void onUidBlockedReasonsChanged(int uid, int blockedReasons);
+
     /**
      * @return true if runtime was restarted, false if it's normal boot
      */
diff --git a/services/core/java/com/android/server/am/ActivityManagerService.java b/services/core/java/com/android/server/am/ActivityManagerService.java
index af4327782889a..58f34f39ac55c 100644
--- a/services/core/java/com/android/server/am/ActivityManagerService.java
+++ b/services/core/java/com/android/server/am/ActivityManagerService.java
@@ -46,6 +46,7 @@ import static android.content.pm.PackageManager.MATCH_DIRECT_BOOT_UNAWARE;
 import static android.content.pm.PackageManager.MATCH_SYSTEM_ONLY;
 import static android.content.pm.PackageManager.MATCH_UNINSTALLED_PACKAGES;
 import static android.content.pm.PackageManager.PERMISSION_GRANTED;
+import static android.net.ConnectivityManager.BLOCKED_REASON_NONE;
 import static android.os.FactoryTest.FACTORY_TEST_OFF;
 import static android.os.IServiceManager.DUMP_FLAG_PRIORITY_CRITICAL;
 import static android.os.IServiceManager.DUMP_FLAG_PRIORITY_HIGH;
@@ -1419,6 +1420,9 @@ public class ActivityManagerService extends IActivityManager.Stub
     final UidObserverController mUidObserverController;
     private volatile IUidObserver mNetworkPolicyUidObserver;
 
+    @GuardedBy("mUidNetworkBlockedReasons")
+    private final SparseIntArray mUidNetworkBlockedReasons = new SparseIntArray();
+
     private final class AppDeathRecipient implements IBinder.DeathRecipient {
         final ProcessRecord mApp;
         final int mPid;
@@ -15622,6 +15626,17 @@ public class ActivityManagerService extends IActivityManager.Stub
             }
         }
 
+        @Override
+        public void onUidBlockedReasonsChanged(int uid, int blockedReasons) {
+            synchronized (mUidNetworkBlockedReasons) {
+                if (blockedReasons == BLOCKED_REASON_NONE) {
+                    mUidNetworkBlockedReasons.delete(uid);
+                } else {
+                    mUidNetworkBlockedReasons.put(uid, blockedReasons);
+                }
+            }
+        }
+
         @Override
         public boolean isRuntimeRestarted() {
             return mSystemServiceManager.isRuntimeRestarted();
diff --git a/services/core/java/com/android/server/net/NetworkPolicyManagerService.java b/services/core/java/com/android/server/net/NetworkPolicyManagerService.java
index 66db72117585b..0c47efe57563f 100644
--- a/services/core/java/com/android/server/net/NetworkPolicyManagerService.java
+++ b/services/core/java/com/android/server/net/NetworkPolicyManagerService.java
@@ -926,6 +926,7 @@ public class NetworkPolicyManagerService extends INetworkPolicyManager.Stub {
 
             mUsageStats = LocalServices.getService(UsageStatsManagerInternal.class);
             mAppStandby = LocalServices.getService(AppStandbyInternal.class);
+            mActivityManagerInternal = LocalServices.getService(ActivityManagerInternal.class);
 
             synchronized (mUidRulesFirstLock) {
                 synchronized (mNetworkPoliciesSecondLock) {
@@ -1003,7 +1004,6 @@ public class NetworkPolicyManagerService extends INetworkPolicyManager.Stub {
                 }
             }
 
-            mActivityManagerInternal = LocalServices.getService(ActivityManagerInternal.class);
             try {
                 final int changes = ActivityManager.UID_OBSERVER_PROCSTATE
                         | ActivityManager.UID_OBSERVER_GONE
@@ -4239,7 +4239,7 @@ public class NetworkPolicyManagerService extends INetworkPolicyManager.Stub {
                     : uidBlockedState.deriveUidRules();
         }
         if (oldEffectiveBlockedReasons != newEffectiveBlockedReasons) {
-            postBlockedReasonsChangedMsg(uid,
+            handleBlockedReasonsChanged(uid,
                     newEffectiveBlockedReasons, oldEffectiveBlockedReasons);
 
             postUidRulesChangedMsg(uid, uidRules);
@@ -4601,6 +4601,9 @@ public class NetworkPolicyManagerService extends INetworkPolicyManager.Stub {
                         someArgs.argi2 = uidBlockedState.effectiveBlockedReasons;
                         someArgs.argi3 = uidBlockedState.deriveUidRules();
                         uidStateUpdates.append(uid, someArgs);
+                        // TODO: Update the state for all changed uids together.
+                        mActivityManagerInternal.onUidBlockedReasonsChanged(uid,
+                                uidBlockedState.effectiveBlockedReasons);
                     }
                 }
             }
@@ -4824,6 +4827,7 @@ public class NetworkPolicyManagerService extends INetworkPolicyManager.Stub {
             mUidBlockedState.delete(uid);
         }
         mUidState.delete(uid);
+        mActivityManagerInternal.onUidBlockedReasonsChanged(uid, BLOCKED_REASON_NONE);
         mUidPolicy.delete(uid);
         mUidFirewallStandbyRules.delete(uid);
         mUidFirewallDozableRules.delete(uid);
@@ -4986,7 +4990,7 @@ public class NetworkPolicyManagerService extends INetworkPolicyManager.Stub {
             }
         }
         if (oldEffectiveBlockedReasons != newEffectiveBlockedReasons) {
-            postBlockedReasonsChangedMsg(uid,
+            handleBlockedReasonsChanged(uid,
                     newEffectiveBlockedReasons, oldEffectiveBlockedReasons);
 
             postUidRulesChangedMsg(uid, uidRules);
@@ -5129,7 +5133,7 @@ public class NetworkPolicyManagerService extends INetworkPolicyManager.Stub {
                     : uidBlockedState.deriveUidRules();
         }
         if (oldEffectiveBlockedReasons != newEffectiveBlockedReasons) {
-            postBlockedReasonsChangedMsg(uid,
+            handleBlockedReasonsChanged(uid,
                     newEffectiveBlockedReasons,
                     oldEffectiveBlockedReasons);
 
@@ -5162,6 +5166,12 @@ public class NetworkPolicyManagerService extends INetworkPolicyManager.Stub {
         }
     }
 
+    private void handleBlockedReasonsChanged(int uid, int newEffectiveBlockedReasons,
+            int oldEffectiveBlockedReasons) {
+        mActivityManagerInternal.onUidBlockedReasonsChanged(uid, newEffectiveBlockedReasons);
+        postBlockedReasonsChangedMsg(uid, newEffectiveBlockedReasons, oldEffectiveBlockedReasons);
+    }
+
     private void postBlockedReasonsChangedMsg(int uid, int newEffectiveBlockedReasons,
             int oldEffectiveBlockedReasons) {
         mHandler.obtainMessage(MSG_UID_BLOCKED_REASON_CHANGED, uid,