Remove duplicate routing logic from Settings app

Also, remove unused MediaRouter2Manager references.

This is a non-functional change.

Bug: 192657812
Test: Presubmit
Change-Id: I72f5f40e157cea922ad40a2602fba881572fb708

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

@@ -40,7 +40,6 @@ import com.android.settingslib.media.LocalMediaManager;
 import com.android.settingslib.media.MediaDevice;
 import com.android.settingslib.utils.ThreadUtils;
 
-import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
 import java.util.concurrent.CopyOnWriteArrayList;
@@ -224,18 +223,8 @@ public class MediaDeviceUpdateWorker extends SliceBackgroundWorker
         return mLocalMediaManager.getSessionName();
     }
 
-    List<RoutingSessionInfo> getActiveRemoteMediaDevice() {
-        final List<RoutingSessionInfo> sessionInfos = new ArrayList<>();
-        for (RoutingSessionInfo info : mLocalMediaManager.getActiveMediaSession()) {
-            if (!info.isSystemSession()) {
-                if (DEBUG) {
-                    Log.d(TAG, "getActiveRemoteMediaDevice() info : " + info.toString()
-                            + ", package name : " + info.getClientPackageName());
-                }
-                sessionInfos.add(info);
-            }
-        }
-        return sessionInfos;
+    List<RoutingSessionInfo> getActiveRemoteMediaDevices() {
+        return mLocalMediaManager.getRemoteRoutingSessions();
     }
 
     /**

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

@@ -100,8 +100,9 @@ public class RemoteMediaSlice implements CustomSliceable {
             Log.e(TAG, "Unable to get the slice worker.");
             return listBuilder.build();
         }
+
         // Only displaying remote devices
-        final List<RoutingSessionInfo> infos = getWorker().getActiveRemoteMediaDevice();
+        final List<RoutingSessionInfo> infos = getWorker().getActiveRemoteMediaDevices();
         if (infos.isEmpty()) {
             Log.d(TAG, "No active remote media device");
             return listBuilder.build();

src/com/android/settings/notification/RemoteVolumeGroupController.java

@@ -54,7 +54,7 @@ public class RemoteVolumeGroupController extends BasePreferenceController implem
     static final String SWITCHER_PREFIX = "OUTPUT_SWITCHER";
 
     private PreferenceCategory mPreferenceCategory;
-    private List<RoutingSessionInfo> mRoutingSessionInfos = new ArrayList<>();
+    private final List<RoutingSessionInfo> mRoutingSessionInfos = new ArrayList<>();
 
     @VisibleForTesting
     LocalMediaManager mLocalMediaManager;
@@ -89,11 +89,7 @@ public class RemoteVolumeGroupController extends BasePreferenceController implem
 
     private void initRemoteMediaSession() {
         mRoutingSessionInfos.clear();
-        for (RoutingSessionInfo info : mLocalMediaManager.getActiveMediaSession()) {
-            if (!info.isSystemSession()) {
-                mRoutingSessionInfos.add(info);
-            }
-        }
+        mRoutingSessionInfos.addAll(mLocalMediaManager.getRemoteRoutingSessions());
     }
 
     @Override