diff --git a/api/current.txt b/api/current.txt
index c8a7956075579..a8b55e7898aba 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -27061,7 +27061,7 @@ package android.media {
     method public void unregisterTransferCallback(@NonNull android.media.MediaRouter2.TransferCallback);
   }
 
-  public static class MediaRouter2.ControllerCallback {
+  public abstract static class MediaRouter2.ControllerCallback {
     ctor public MediaRouter2.ControllerCallback();
     method public void onControllerUpdated(@NonNull android.media.MediaRouter2.RoutingController);
   }
@@ -27070,7 +27070,7 @@ package android.media {
     method @Nullable public android.os.Bundle onGetControllerHints(@NonNull android.media.MediaRoute2Info);
   }
 
-  public static class MediaRouter2.RouteCallback {
+  public abstract static class MediaRouter2.RouteCallback {
     ctor public MediaRouter2.RouteCallback();
     method public void onRoutesAdded(@NonNull java.util.List<android.media.MediaRoute2Info>);
     method public void onRoutesChanged(@NonNull java.util.List<android.media.MediaRoute2Info>);
@@ -27093,7 +27093,7 @@ package android.media {
     method public void setVolume(int);
   }
 
-  public static class MediaRouter2.TransferCallback {
+  public abstract static class MediaRouter2.TransferCallback {
     ctor public MediaRouter2.TransferCallback();
     method public void onTransferFailed(@NonNull android.media.MediaRoute2Info);
     method public void onTransferred(@NonNull android.media.MediaRouter2.RoutingController, @Nullable android.media.MediaRouter2.RoutingController);
diff --git a/media/java/android/media/MediaRouter2.java b/media/java/android/media/MediaRouter2.java
index 34109194acbab..68df7d2b192ef 100644
--- a/media/java/android/media/MediaRouter2.java
+++ b/media/java/android/media/MediaRouter2.java
@@ -749,7 +749,7 @@ public class MediaRouter2 {
     /**
      * Callback for receiving events about media route discovery.
      */
-    public static class RouteCallback {
+    public abstract static class RouteCallback {
         /**
          * Called when routes are added. Whenever you registers a callback, this will
          * be invoked with known routes.
@@ -777,7 +777,7 @@ public class MediaRouter2 {
     /**
      * Callback for receiving events on media transfer.
      */
-    public static class TransferCallback {
+    public abstract static class TransferCallback {
         /**
          * Called when a media is transferred between two different routing controllers.
          * This can happen by calling {@link #transferTo(MediaRoute2Info)} or
@@ -826,7 +826,7 @@ public class MediaRouter2 {
     /**
      * Callback for receiving {@link RoutingController} updates.
      */
-    public static class ControllerCallback {
+    public abstract static class ControllerCallback {
         /**
          * Called when a controller is updated. (e.g., the selected routes of the
          * controller is changed or the volume of the controller is changed.)
diff --git a/media/tests/MediaRouter/src/com/android/mediaroutertest/MediaRouter2ManagerTest.java b/media/tests/MediaRouter/src/com/android/mediaroutertest/MediaRouter2ManagerTest.java
index bcff6a1df918b..4e12859fa575e 100644
--- a/media/tests/MediaRouter/src/com/android/mediaroutertest/MediaRouter2ManagerTest.java
+++ b/media/tests/MediaRouter/src/com/android/mediaroutertest/MediaRouter2ManagerTest.java
@@ -123,7 +123,7 @@ public class MediaRouter2ManagerTest {
 
     @Test
     public void testOnRoutesRemovedAndAdded() throws Exception {
-        RouteCallback routeCallback = new RouteCallback();
+        RouteCallback routeCallback = new RouteCallback() {};
         mRouteCallbacks.add(routeCallback);
         mRouter2.registerRouteCallback(mExecutor, routeCallback,
                 new RouteDiscoveryPreference.Builder(FEATURES_ALL, true).build());
@@ -201,7 +201,7 @@ public class MediaRouter2ManagerTest {
 
         addManagerCallback(new MediaRouter2Manager.Callback());
         //TODO: remove this when it's not necessary.
-        addRouterCallback(new MediaRouter2.RouteCallback());
+        addRouterCallback(new MediaRouter2.RouteCallback() {});
         addTransferCallback(new MediaRouter2.TransferCallback() {
             @Override
             public void onTransferred(MediaRouter2.RoutingController oldController,
@@ -228,7 +228,7 @@ public class MediaRouter2ManagerTest {
         CountDownLatch latch = new CountDownLatch(1);
 
         Map<String, MediaRoute2Info> routes = waitAndGetRoutesWithManager(FEATURES_ALL);
-        addRouterCallback(new RouteCallback());
+        addRouterCallback(new RouteCallback() {});
         addManagerCallback(new MediaRouter2Manager.Callback() {
             @Override
             public void onSessionCreated(MediaRouter2Manager.RoutingController controller) {
@@ -263,7 +263,7 @@ public class MediaRouter2ManagerTest {
     @Test
     public void testSelectAndTransferAndRelease() throws Exception {
         Map<String, MediaRoute2Info> routes = waitAndGetRoutesWithManager(FEATURES_ALL);
-        addRouterCallback(new RouteCallback());
+        addRouterCallback(new RouteCallback() {});
 
         CountDownLatch onSessionCreatedLatch = new CountDownLatch(1);
 
@@ -346,7 +346,7 @@ public class MediaRouter2ManagerTest {
     @Test
     public void testSetSessionVolume() throws Exception {
         Map<String, MediaRoute2Info> routes = waitAndGetRoutesWithManager(FEATURES_ALL);
-        addRouterCallback(new RouteCallback());
+        addRouterCallback(new RouteCallback() {});
 
         CountDownLatch onSessionCreatedLatch = new CountDownLatch(1);
         CountDownLatch volumeChangedLatch = new CountDownLatch(2);
@@ -471,7 +471,7 @@ public class MediaRouter2ManagerTest {
         CountDownLatch featuresLatch = new CountDownLatch(1);
 
         // A dummy callback is required to send route feature info.
-        RouteCallback routeCallback = new RouteCallback();
+        RouteCallback routeCallback = new RouteCallback() {};
         MediaRouter2Manager.Callback managerCallback = new MediaRouter2Manager.Callback() {
             @Override
             public void onRoutesAdded(List<MediaRoute2Info> routes) {