diff --git a/core/java/android/net/CaptivePortal.java b/core/java/android/net/CaptivePortal.java
index 448fe5a051..8afeb3033c 100644
--- a/core/java/android/net/CaptivePortal.java
+++ b/core/java/android/net/CaptivePortal.java
@@ -15,6 +15,7 @@
  */
 package android.net;
 
+import android.annotation.IntDef;
 import android.annotation.NonNull;
 import android.annotation.RequiresPermission;
 import android.annotation.SystemApi;
@@ -24,6 +25,8 @@ import android.os.Parcel;
 import android.os.Parcelable;
 import android.os.RemoteException;
 
+import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
+
 /**
  * A class allowing apps handling the {@link ConnectivityManager#ACTION_CAPTIVE_PORTAL_SIGN_IN}
  * activity to indicate to the system different outcomes of captive portal sign in.  This class is
@@ -76,6 +79,17 @@ public class CaptivePortal implements Parcelable {
 
     private final IBinder mBinder;
 
+    /** @hide */
+    @IntDef(value = {
+        MetricsEvent.ACTION_CAPTIVE_PORTAL_LOGIN_ACTIVITY,
+        MetricsEvent.ACTION_CAPTIVE_PORTAL_LOGIN_RESULT_DISMISSED,
+        MetricsEvent.ACTION_CAPTIVE_PORTAL_LOGIN_RESULT_UNWANTED,
+        MetricsEvent.ACTION_CAPTIVE_PORTAL_LOGIN_RESULT_WANTED_AS_IS,
+        MetricsEvent.CAPTIVE_PORTAL_LOGIN_ACTIVITY_SSL_ERROR,
+    })
+    public @interface EventId {
+    }
+
     /** @hide */
     public CaptivePortal(@NonNull IBinder binder) {
         mBinder = binder;
@@ -170,7 +184,7 @@ public class CaptivePortal implements Parcelable {
      */
     @SystemApi
     @TestApi
-    public void logEvent(int eventId, @NonNull String packageName) {
+    public void logEvent(@EventId int eventId, @NonNull String packageName) {
         try {
             ICaptivePortal.Stub.asInterface(mBinder).logEvent(eventId, packageName);
         } catch (RemoteException e) {