diff --git a/media/java/android/media/IMediaRouterClient.aidl b/media/java/android/media/IMediaRouterClient.aidl
index 240ae796f9574..53122bb990d64 100644
--- a/media/java/android/media/IMediaRouterClient.aidl
+++ b/media/java/android/media/IMediaRouterClient.aidl
@@ -23,4 +23,5 @@ oneway interface IMediaRouterClient {
     void onStateChanged();
     void onRestoreRoute();
     void onSelectedRouteChanged(String routeId);
+    void onGlobalA2dpChanged(boolean a2dpOn);
 }
diff --git a/media/java/android/media/MediaRouter.java b/media/java/android/media/MediaRouter.java
index 12fc3a60cf283..7ae2949e60749 100644
--- a/media/java/android/media/MediaRouter.java
+++ b/media/java/android/media/MediaRouter.java
@@ -621,33 +621,27 @@ public class MediaRouter {
         final class Client extends IMediaRouterClient.Stub {
             @Override
             public void onStateChanged() {
-                mHandler.post(new Runnable() {
-                    @Override
-                    public void run() {
-                        if (Client.this == mClient) {
-                            updateClientState();
-                        }
+                mHandler.post(() -> {
+                    if (Client.this == mClient) {
+                        updateClientState();
                     }
                 });
             }
 
             @Override
             public void onRestoreRoute() {
-                mHandler.post(new Runnable() {
-                    @Override
-                    public void run() {
-                        // Skip restoring route if the selected route is not a system audio route,
-                        // MediaRouter is initializing, or mClient was changed.
-                        if (Client.this != mClient || mSelectedRoute == null
-                                || (mSelectedRoute != mDefaultAudioVideo
-                                        && mSelectedRoute != mBluetoothA2dpRoute)) {
-                            return;
-                        }
-                        if (DEBUG) {
-                            Log.d(TAG, "onRestoreRoute() : route=" + mSelectedRoute);
-                        }
-                        mSelectedRoute.select();
+                mHandler.post(() -> {
+                    // Skip restoring route if the selected route is not a system audio route,
+                    // MediaRouter is initializing, or mClient was changed.
+                    if (Client.this != mClient || mSelectedRoute == null
+                            || (mSelectedRoute != mDefaultAudioVideo
+                                    && mSelectedRoute != mBluetoothA2dpRoute)) {
+                        return;
                     }
+                    if (DEBUG) {
+                        Log.d(TAG, "onRestoreRoute() : route=" + mSelectedRoute);
+                    }
+                    mSelectedRoute.select();
                 });
             }
 
@@ -659,6 +653,19 @@ public class MediaRouter {
                     }
                 });
             }
+
+            // Called when the selection of a connected device (phone speaker or BT devices)
+            // is changed.
+            @Override
+            public void onGlobalA2dpChanged(boolean a2dpOn) {
+                mHandler.post(() -> {
+                    if (mSelectedRoute == mDefaultAudioVideo && a2dpOn) {
+                        setSelectedRoute(mBluetoothA2dpRoute, false);
+                    } else if (mSelectedRoute == mBluetoothA2dpRoute && !a2dpOn) {
+                        setSelectedRoute(mDefaultAudioVideo, false);
+                    }
+                });
+            }
         }
     }
 
diff --git a/services/core/java/com/android/server/media/MediaRouterService.java b/services/core/java/com/android/server/media/MediaRouterService.java
index bf2cc5e68facc..3337b480d6a8f 100644
--- a/services/core/java/com/android/server/media/MediaRouterService.java
+++ b/services/core/java/com/android/server/media/MediaRouterService.java
@@ -891,8 +891,24 @@ public final class MediaRouterService extends IMediaRouterService.Stub
             if (intent.getAction().equals(BluetoothA2dp.ACTION_ACTIVE_DEVICE_CHANGED)) {
                 BluetoothDevice btDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                 synchronized (mLock) {
+                    boolean wasA2dpOn = mGlobalBluetoothA2dpOn;
                     mActiveBluetoothDevice = btDevice;
                     mGlobalBluetoothA2dpOn = btDevice != null;
+                    if (wasA2dpOn != mGlobalBluetoothA2dpOn) {
+                        UserRecord userRecord = mUserRecords.get(mCurrentUserId);
+                        if (userRecord != null) {
+                            for (ClientRecord cr : userRecord.mClientRecords) {
+                                // mSelectedRouteId will be null for BT and phone speaker.
+                                if (cr.mSelectedRouteId == null) {
+                                    try {
+                                        cr.mClient.onGlobalA2dpChanged(mGlobalBluetoothA2dpOn);
+                                    } catch (RemoteException e) {
+                                        // Ignore exception
+                                    }
+                                }
+                            }
+                        }
+                    }
                 }
             }
         }