diff --git a/core/java/android/net/ConnectivityManager.java b/core/java/android/net/ConnectivityManager.java
index dcf3b5c..f13c586 100644
--- a/core/java/android/net/ConnectivityManager.java
+++ b/core/java/android/net/ConnectivityManager.java
@@ -899,6 +899,18 @@
     }
 
     /**
+     * @hide
+     * TODO: Expose for SystemServer when becomes a module.
+     */
+    public void systemReady() {
+        try {
+            mService.systemReady();
+        } catch (RemoteException e) {
+            throw e.rethrowFromSystemServer();
+        }
+    }
+
+    /**
      * Checks if a given type uses the cellular data connection.
      * This should be replaced in the future by a network property.
      * @param networkType the type to check
diff --git a/core/java/android/net/IConnectivityManager.aidl b/core/java/android/net/IConnectivityManager.aidl
index d7f178c..059ec28 100644
--- a/core/java/android/net/IConnectivityManager.aidl
+++ b/core/java/android/net/IConnectivityManager.aidl
@@ -233,4 +233,6 @@
 
     void simulateDataStall(int detectionMethod, long timestampMillis, in Network network,
                 in PersistableBundle extras);
+
+    void systemReady();
 }
diff --git a/services/core/java/com/android/server/ConnectivityService.java b/services/core/java/com/android/server/ConnectivityService.java
index bb9f6d2..fc6abc8 100644
--- a/services/core/java/com/android/server/ConnectivityService.java
+++ b/services/core/java/com/android/server/ConnectivityService.java
@@ -2301,10 +2301,21 @@
     }
 
     /**
-     * Called when the system is ready and ConnectivityService can initialize remaining components.
+     * Called by SystemServer through ConnectivityManager when the system is ready.
+     */
+    @Override
+    public void systemReady() {
+        if (Binder.getCallingUid() != Process.SYSTEM_UID) {
+            throw new SecurityException("Calling Uid is not system uid.");
+        }
+        systemReadyInternal();
+    }
+
+    /**
+     * Called when ConnectivityService can initialize remaining components.
      */
     @VisibleForTesting
-    public void systemReady() {
+    public void systemReadyInternal() {
         // Let PermissionMonitor#startMonitoring() running in the beginning of the systemReady
         // before MultipathPolicyTracker.start(). Since mApps in PermissionMonitor needs to be
         // populated first to ensure that listening network request which is sent by
diff --git a/services/core/java/com/android/server/ConnectivityServiceInitializer.java b/services/core/java/com/android/server/ConnectivityServiceInitializer.java
new file mode 100644
index 0000000..2bc8925
--- /dev/null
+++ b/services/core/java/com/android/server/ConnectivityServiceInitializer.java
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.server;
+
+import static android.os.IServiceManager.DUMP_FLAG_PRIORITY_HIGH;
+import static android.os.IServiceManager.DUMP_FLAG_PRIORITY_NORMAL;
+
+import android.content.Context;
+import android.net.INetworkPolicyManager;
+import android.net.INetworkStatsService;
+import android.os.INetworkManagementService;
+import android.os.ServiceManager;
+import android.util.Log;
+
+/**
+ * Connectivity service initializer for core networking. This is called by system server to create
+ * a new instance of ConnectivityService.
+ */
+public final class ConnectivityServiceInitializer extends SystemService {
+    private static final String TAG = ConnectivityServiceInitializer.class.getSimpleName();
+    private final ConnectivityService mConnectivity;
+
+    public ConnectivityServiceInitializer(Context context) {
+        super(context);
+        // TODO: Define formal APIs to get the needed services.
+        mConnectivity = new ConnectivityService(context, getNetworkManagementService(),
+                getNetworkStatsService(), getNetworkPolicyManager());
+    }
+
+    @Override
+    public void onStart() {
+        Log.i(TAG, "Registering " + Context.CONNECTIVITY_SERVICE);
+        publishBinderService(Context.CONNECTIVITY_SERVICE, mConnectivity,
+                /* allowIsolated= */ false, DUMP_FLAG_PRIORITY_HIGH | DUMP_FLAG_PRIORITY_NORMAL);
+    }
+
+    private INetworkManagementService getNetworkManagementService() {
+        return INetworkManagementService.Stub.asInterface(
+               ServiceManager.getService(Context.NETWORKMANAGEMENT_SERVICE));
+    }
+
+    private INetworkStatsService getNetworkStatsService() {
+        return INetworkStatsService.Stub.asInterface(
+                ServiceManager.getService(Context.NETWORK_STATS_SERVICE));
+    }
+
+    private INetworkPolicyManager getNetworkPolicyManager() {
+        return INetworkPolicyManager.Stub.asInterface(
+                ServiceManager.getService(Context.NETWORK_POLICY_SERVICE));
+    }
+
+}
diff --git a/tests/net/Android.bp b/tests/net/Android.bp
index 0fe84ab..cd2dc04 100644
--- a/tests/net/Android.bp
+++ b/tests/net/Android.bp
@@ -59,6 +59,7 @@
         "mockito-target-minus-junit4",
         "net-tests-utils",
         "platform-test-annotations",
+        "service-connectivity",
         "services.core",
         "services.net",
     ],
diff --git a/tests/net/integration/src/com/android/server/net/integrationtests/ConnectivityServiceIntegrationTest.kt b/tests/net/integration/src/com/android/server/net/integrationtests/ConnectivityServiceIntegrationTest.kt
index bc069e1..dba1856 100644
--- a/tests/net/integration/src/com/android/server/net/integrationtests/ConnectivityServiceIntegrationTest.kt
+++ b/tests/net/integration/src/com/android/server/net/integrationtests/ConnectivityServiceIntegrationTest.kt
@@ -167,7 +167,7 @@
         cm = ConnectivityManager(context, service)
         context.addMockSystemService(Context.CONNECTIVITY_SERVICE, cm)
 
-        service.systemReady()
+        service.systemReadyInternal()
     }
 
     private inner class TestConnectivityService(deps: Dependencies) : ConnectivityService(
diff --git a/tests/net/java/com/android/server/ConnectivityServiceTest.java b/tests/net/java/com/android/server/ConnectivityServiceTest.java
index 862e552..998aee4 100644
--- a/tests/net/java/com/android/server/ConnectivityServiceTest.java
+++ b/tests/net/java/com/android/server/ConnectivityServiceTest.java
@@ -1246,7 +1246,7 @@
         // Create local CM before sending system ready so that we can answer
         // getSystemService() correctly.
         mCm = new WrappedConnectivityManager(InstrumentationRegistry.getContext(), mService);
-        mService.systemReady();
+        mService.systemReadyInternal();
         mockVpn(Process.myUid());
         mCm.bindProcessToNetwork(null);