Fix output switcher will show 2 media sessions in some use cases

Before this CL, we didn't check whether the remote session existed
in the list before. If the priority of a remote session is higher than
a local session, it causes us to return the local session even if
the list has a remote session.

This CL uses a list to cache package names of remote sessions.
If the local session has the same package name of the remote session
then don't return the local session.

Bug: 169052790
Test: make -j42 RunSettingsRoboTests
Change-Id: I2726a3deb397f646e4c74a8c445dde6fafb694a8
Merged-In: I2726a3deb397f646e4c74a8c445dde6fafb694a8
(cherry picked from commit 3a7293cbbf)

src/com/android/settings/media/MediaOutputUtils.java

@@ -25,6 +25,9 @@ import androidx.annotation.Nullable;
 
 import com.android.settings.sound.MediaOutputPreferenceController;
 
+import java.util.ArrayList;
+import java.util.List;
+
 /**
  * Utilities that can be shared between {@link MediaOutputIndicatorWorker} and
  * {@link MediaOutputPreferenceController}.
@@ -43,6 +46,7 @@ public class MediaOutputUtils {
             MediaSessionManager mediaSessionManager) {
 
         MediaController localController = null;
+        final List<String> remoteMediaSessionLists = new ArrayList<>();
         for (MediaController controller : mediaSessionManager.getActiveSessions(null)) {
             final MediaController.PlaybackInfo pi = controller.getPlaybackInfo();
             if (pi == null) {
@@ -69,10 +73,14 @@ public class MediaOutputUtils {
                         controller.getPackageName())) {
                     localController = null;
                 }
+                if (!remoteMediaSessionLists.contains(controller.getPackageName())) {
+                    remoteMediaSessionLists.add(controller.getPackageName());
+                }
                 continue;
             }
             if (pi.getPlaybackType() == MediaController.PlaybackInfo.PLAYBACK_TYPE_LOCAL) {
-                if (localController == null) {
+                if (localController == null
+                        && !remoteMediaSessionLists.contains(controller.getPackageName())) {
                     localController = controller;
                 }
             }