diff --git a/services/core/java/com/android/server/ConnectivityService.java b/services/core/java/com/android/server/ConnectivityService.java
index 86f0fb9..a330a74 100644
--- a/services/core/java/com/android/server/ConnectivityService.java
+++ b/services/core/java/com/android/server/ConnectivityService.java
@@ -1803,12 +1803,28 @@
 
     private INetworkManagementEventObserver mDataActivityObserver = new BaseNetworkObserver() {
         @Override
-        public void interfaceClassDataActivityChanged(int networkType, boolean active, long tsNanos,
-                int uid) {
-            sendDataActivityBroadcast(networkType, active, tsNanos);
+        public void interfaceClassDataActivityChanged(int transportType, boolean active,
+                long tsNanos, int uid) {
+            sendDataActivityBroadcast(transportTypeToLegacyType(transportType), active, tsNanos);
         }
     };
 
+    // This is deprecated and only to support legacy use cases.
+    private int transportTypeToLegacyType(int type) {
+        switch (type) {
+            case NetworkCapabilities.TRANSPORT_CELLULAR:
+                return ConnectivityManager.TYPE_MOBILE;
+            case NetworkCapabilities.TRANSPORT_WIFI:
+                return ConnectivityManager.TYPE_WIFI;
+            case NetworkCapabilities.TRANSPORT_BLUETOOTH:
+                return ConnectivityManager.TYPE_BLUETOOTH;
+            case NetworkCapabilities.TRANSPORT_ETHERNET:
+                return ConnectivityManager.TYPE_ETHERNET;
+            default:
+                loge("Unexpected transport in transportTypeToLegacyType: " + type);
+        }
+        return ConnectivityManager.TYPE_NONE;
+    }
     /**
      * Ensures that the system cannot call a particular method.
      */
@@ -2392,13 +2408,13 @@
             timeout = Settings.Global.getInt(mContext.getContentResolver(),
                                              Settings.Global.DATA_ACTIVITY_TIMEOUT_MOBILE,
                                              10);
-            type = ConnectivityManager.TYPE_MOBILE;
+            type = NetworkCapabilities.TRANSPORT_CELLULAR;
         } else if (networkAgent.networkCapabilities.hasTransport(
                 NetworkCapabilities.TRANSPORT_WIFI)) {
             timeout = Settings.Global.getInt(mContext.getContentResolver(),
                                              Settings.Global.DATA_ACTIVITY_TIMEOUT_WIFI,
                                              15);
-            type = ConnectivityManager.TYPE_WIFI;
+            type = NetworkCapabilities.TRANSPORT_WIFI;
         } else {
             return; // do not track any other networks
         }
diff --git a/tests/net/java/com/android/server/ConnectivityServiceTest.java b/tests/net/java/com/android/server/ConnectivityServiceTest.java
index a2bec3c..2e70be7 100644
--- a/tests/net/java/com/android/server/ConnectivityServiceTest.java
+++ b/tests/net/java/com/android/server/ConnectivityServiceTest.java
@@ -7428,7 +7428,7 @@
         mCellNetworkAgent.connect(true);
         networkCallback.expectAvailableThenValidatedCallbacks(mCellNetworkAgent);
         verify(mNetworkManagementService, times(1)).addIdleTimer(eq(MOBILE_IFNAME), anyInt(),
-                eq(ConnectivityManager.TYPE_MOBILE));
+                eq(NetworkCapabilities.TRANSPORT_CELLULAR));
 
         mWiFiNetworkAgent = new TestNetworkAgentWrapper(TRANSPORT_WIFI);
         final LinkProperties wifiLp = new LinkProperties();
@@ -7442,7 +7442,7 @@
         networkCallback.expectCallback(CallbackEntry.LOSING, mCellNetworkAgent);
         networkCallback.expectCapabilitiesWith(NET_CAPABILITY_VALIDATED, mWiFiNetworkAgent);
         verify(mNetworkManagementService, times(1)).addIdleTimer(eq(WIFI_IFNAME), anyInt(),
-                eq(ConnectivityManager.TYPE_WIFI));
+                eq(NetworkCapabilities.TRANSPORT_WIFI));
         verify(mNetworkManagementService, times(1)).removeIdleTimer(eq(MOBILE_IFNAME));
 
         // Disconnect wifi and switch back to cell
@@ -7452,7 +7452,7 @@
         assertNoCallbacks(networkCallback);
         verify(mNetworkManagementService, times(1)).removeIdleTimer(eq(WIFI_IFNAME));
         verify(mNetworkManagementService, times(1)).addIdleTimer(eq(MOBILE_IFNAME), anyInt(),
-                eq(ConnectivityManager.TYPE_MOBILE));
+                eq(NetworkCapabilities.TRANSPORT_CELLULAR));
 
         // reconnect wifi
         mWiFiNetworkAgent = new TestNetworkAgentWrapper(TRANSPORT_WIFI);