Make RouteListingPreference getter and callbacks public

This change exposes getRouteListingPreference(),
onRouteListingPreferenceChanged(), and other callback-related
methods.

This is a non-functional change.

Test: Presubmit.
Bug: 192657812
Bug: 281067101
Change-Id: Iea44d9eef42bfb0add775b7514430739bfe39c62
API-Coverage-Bug: 294073926
diff --git a/AconfigFlags.bp b/AconfigFlags.bp
index 6bd6c93..09225a5 100644
--- a/AconfigFlags.bp
+++ b/AconfigFlags.bp
@@ -31,6 +31,7 @@
         ":android.companion.virtual.flags-aconfig-java{.generated_srcjars}",
         ":android.view.inputmethod.flags-aconfig-java{.generated_srcjars}",
         ":android.widget.flags-aconfig-java{.generated_srcjars}",
+        ":com.android.media.flags.bettertogether-aconfig-java{.generated_srcjars}",
     ],
     // Add aconfig-annotations-lib as a dependency for the optimization
     libs: ["aconfig-annotations-lib"],
@@ -214,3 +215,15 @@
     defaults: ["framework-minus-apex-aconfig-java-defaults"],
 }
 
+// Media BetterTogether
+aconfig_declarations {
+    name: "com.android.media.flags.bettertogether-aconfig",
+    package: "com.android.media.flags",
+    srcs: ["media/java/android/media/flags/media_better_together.aconfig"],
+}
+
+java_aconfig_library {
+    name: "com.android.media.flags.bettertogether-aconfig-java",
+    aconfig_declarations: "com.android.media.flags.bettertogether-aconfig",
+    defaults: ["framework-minus-apex-aconfig-java-defaults"],
+}