diff --git a/core/java/android/net/INetworkManagementEventObserver.aidl b/core/java/android/net/INetworkManagementEventObserver.aidl
index 55ae2185c226c..37813ce11a5f8 100644
--- a/core/java/android/net/INetworkManagementEventObserver.aidl
+++ b/core/java/android/net/INetworkManagementEventObserver.aidl
@@ -85,14 +85,14 @@ oneway interface INetworkManagementEventObserver {
     /**
      * Interface data activity status is changed.
      *
-     * @param label Unique identifier indicates the network type of the data activity change.
+     * @param networkType The legacy network type of the data activity change.
      * @param active  True if the interface is actively transmitting data, false if it is idle.
      * @param tsNanos Elapsed realtime in nanos when the state of the network interface changed.
      * @param uid Uid of this event. It represents the uid that was responsible for waking the
      *            radio. For those events that are reported by system itself, not from specific uid,
      *            use -1 for the events which means no uid.
      */
-    void interfaceClassDataActivityChanged(String label, boolean active, long tsNanos, int uid);
+    void interfaceClassDataActivityChanged(int networkType, boolean active, long tsNanos, int uid);
 
     /**
      * Information about available DNS servers has been received.
diff --git a/core/java/com/android/server/net/BaseNetworkObserver.java b/core/java/com/android/server/net/BaseNetworkObserver.java
index 0e8d61a041792..93f89b5db8205 100644
--- a/core/java/com/android/server/net/BaseNetworkObserver.java
+++ b/core/java/com/android/server/net/BaseNetworkObserver.java
@@ -64,7 +64,7 @@ public class BaseNetworkObserver extends INetworkManagementEventObserver.Stub {
     }
 
     @Override
-    public void interfaceClassDataActivityChanged(String label, boolean active, long tsNanos,
+    public void interfaceClassDataActivityChanged(int networkType, boolean active, long tsNanos,
             int uid) {
         // default no-op
     }
diff --git a/services/core/java/com/android/server/ConnectivityService.java b/services/core/java/com/android/server/ConnectivityService.java
index 542d043379745..fe116d9a507b8 100644
--- a/services/core/java/com/android/server/ConnectivityService.java
+++ b/services/core/java/com/android/server/ConnectivityService.java
@@ -1792,10 +1792,9 @@ public class ConnectivityService extends IConnectivityManager.Stub
 
     private INetworkManagementEventObserver mDataActivityObserver = new BaseNetworkObserver() {
         @Override
-        public void interfaceClassDataActivityChanged(String label, boolean active, long tsNanos,
+        public void interfaceClassDataActivityChanged(int networkType, boolean active, long tsNanos,
                 int uid) {
-            int deviceType = Integer.parseInt(label);
-            sendDataActivityBroadcast(deviceType, active, tsNanos);
+            sendDataActivityBroadcast(networkType, active, tsNanos);
         }
     };
 
diff --git a/services/core/java/com/android/server/NetworkManagementService.java b/services/core/java/com/android/server/NetworkManagementService.java
index bd4253bb8e818..1ea4a89a761f0 100644
--- a/services/core/java/com/android/server/NetworkManagementService.java
+++ b/services/core/java/com/android/server/NetworkManagementService.java
@@ -423,7 +423,7 @@ public class NetworkManagementService extends INetworkManagementService.Stub {
 
         final boolean active = isActive;
         invokeForAllObservers(o -> o.interfaceClassDataActivityChanged(
-                Integer.toString(type), active, tsNanos, uid));
+                type, active, tsNanos, uid));
 
         boolean report = false;
         synchronized (mIdleTimerLock) {
diff --git a/tests/net/java/com/android/server/NetworkManagementServiceTest.java b/tests/net/java/com/android/server/NetworkManagementServiceTest.java
index f3e23e87b508f..13516d75a50d7 100644
--- a/tests/net/java/com/android/server/NetworkManagementServiceTest.java
+++ b/tests/net/java/com/android/server/NetworkManagementServiceTest.java
@@ -167,13 +167,13 @@ public class NetworkManagementServiceTest {
          * Interface class activity.
          */
         unsolListener.onInterfaceClassActivityChanged(true, 1, 1234, TEST_UID);
-        expectSoon(observer).interfaceClassDataActivityChanged("1", true, 1234, TEST_UID);
+        expectSoon(observer).interfaceClassDataActivityChanged(1, true, 1234, TEST_UID);
 
         unsolListener.onInterfaceClassActivityChanged(false, 9, 5678, TEST_UID);
-        expectSoon(observer).interfaceClassDataActivityChanged("9", false, 5678, TEST_UID);
+        expectSoon(observer).interfaceClassDataActivityChanged(9, false, 5678, TEST_UID);
 
         unsolListener.onInterfaceClassActivityChanged(false, 9, 4321, TEST_UID);
-        expectSoon(observer).interfaceClassDataActivityChanged("9", false, 4321, TEST_UID);
+        expectSoon(observer).interfaceClassDataActivityChanged(9, false, 4321, TEST_UID);
 
         /**
          * IP address changes.