diff --git a/core/java/com/android/internal/app/MediaRouteControllerDialog.java b/core/java/com/android/internal/app/MediaRouteControllerDialog.java
index 5ce3e54561ce1..635a868d359a3 100644
--- a/core/java/com/android/internal/app/MediaRouteControllerDialog.java
+++ b/core/java/com/android/internal/app/MediaRouteControllerDialog.java
@@ -142,7 +142,11 @@ public class MediaRouteControllerDialog extends AlertDialog {
                     @Override
                     public void onClick(DialogInterface dialogInterface, int id) {
                         if (mRoute.isSelected()) {
-                            mRouter.getDefaultRoute().select();
+                            if (mRoute.isBluetooth()) {
+                                mRouter.getDefaultRoute().select();
+                            } else {
+                                mRouter.getFallbackRoute().select();
+                            }
                         }
                         dismiss();
                     }
diff --git a/media/java/android/media/MediaRouter.java b/media/java/android/media/MediaRouter.java
index d5509c14e09b4..8caba81c09cbf 100644
--- a/media/java/android/media/MediaRouter.java
+++ b/media/java/android/media/MediaRouter.java
@@ -731,6 +731,15 @@ public class MediaRouter {
         return sStatic.mDefaultAudioVideo;
     }
 
+    /**
+     * Returns a Bluetooth route if available, otherwise the default route.
+     * @hide
+     */
+    public RouteInfo getFallbackRoute() {
+        return (sStatic.mBluetoothA2dpRoute != null)
+                ? sStatic.mBluetoothA2dpRoute : sStatic.mDefaultAudioVideo;
+    }
+
     /**
      * @hide for use by framework routing UI
      */
@@ -913,6 +922,19 @@ public class MediaRouter {
                 (route == btRoute || route == sStatic.mDefaultAudioVideo)) {
             try {
                 sStatic.mAudioService.setBluetoothA2dpOn(route == btRoute);
+                // TODO: Remove the following logging when no longer needed.
+                if (route != btRoute) {
+                    StackTraceElement[] callStack = Thread.currentThread().getStackTrace();
+                    StringBuffer sb = new StringBuffer();
+                    // callStack[3] is the caller of this method.
+                    for (int i = 3; i < callStack.length; i++) {
+                        StackTraceElement caller = callStack[i];
+                        sb.append(caller.getClassName() + "." + caller.getMethodName()
+                                + ":" + caller.getLineNumber()).append("  ");
+                    }
+                    Log.w(TAG, "Default route is selected while a BT route is available: pkgName="
+                            + sStatic.mPackageName + ", callers=" + sb.toString());
+                }
             } catch (RemoteException e) {
                 Log.e(TAG, "Error changing Bluetooth A2DP state", e);
             }
@@ -1998,6 +2020,11 @@ public class MediaRouter {
             return this == sStatic.mDefaultAudioVideo;
         }
 
+        /** @hide */
+        public boolean isBluetooth() {
+            return this == sStatic.mBluetoothA2dpRoute;
+        }
+
         /** @hide */
         public void select() {
             selectRouteStatic(mSupportedTypes, this, true);
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/policy/CastControllerImpl.java b/packages/SystemUI/src/com/android/systemui/statusbar/policy/CastControllerImpl.java
index b89a77b0b3d62..2bf62bb043187 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/policy/CastControllerImpl.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/policy/CastControllerImpl.java
@@ -182,7 +182,7 @@ public class CastControllerImpl implements CastController {
                 Log.w(TAG, "Projection is no longer active: " + projection);
             }
         } else {
-            mMediaRouter.getDefaultRoute().select();
+            mMediaRouter.getFallbackRoute().select();
         }
     }
 
diff --git a/services/core/java/com/android/server/media/projection/MediaProjectionManagerService.java b/services/core/java/com/android/server/media/projection/MediaProjectionManagerService.java
index 9d92cbcb2d03e..a6ea6b2e1aeb3 100644
--- a/services/core/java/com/android/server/media/projection/MediaProjectionManagerService.java
+++ b/services/core/java/com/android/server/media/projection/MediaProjectionManagerService.java
@@ -111,7 +111,7 @@ public final class MediaProjectionManagerService extends SystemService
             mProjectionGrant.stop();
         }
         if (mMediaRouteInfo != null) {
-            mMediaRouter.getDefaultRoute().select();
+            mMediaRouter.getFallbackRoute().select();
         }
         mProjectionToken = projection.asBinder();
         mProjectionGrant = projection;