SysUI: Correctly compare MediaControllers

Instead of comparing MediaControllers via reference equality
(which is never true), go deeper and check whether the two
controllers are connected to the same IBinder.

Bug: 17571414
Change-Id: Id25d70be0a60d1900e977310dedcc7063552e018

media/java/android/media/session/MediaController.java

@@ -434,6 +434,14 @@ public final class MediaController {
         return mSessionBinder;
     }
 
+    /**
+     * @hide
+     */
+    public boolean controlsSameSession(MediaController other) {
+        if (other == null) return false;
+        return mSessionBinder.asBinder() == other.getSessionBinder().asBinder();
+    }
+
     private void addCallbackLocked(Callback cb, Handler handler) {
         if (getHandlerForCallbackLocked(cb) != null) {
             Log.w(TAG, "Callback is already added, ignoring");

packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java

@@ -1748,7 +1748,7 @@ public class PhoneStatusBar extends BaseStatusBar implements DemoMode,
                 }
             }
 
-            if (controller != mMediaController) {
+            if (!sameSessions(mMediaController, controller)) {
                 // We have a new media session
 
                 if (mMediaController != null) {
@@ -1797,6 +1797,12 @@ public class PhoneStatusBar extends BaseStatusBar implements DemoMode,
         updateMediaMetaData(metaDataChanged);
     }
 
+    private boolean sameSessions(MediaController a, MediaController b) {
+        if (a == b) return true;
+        if (a == null) return false;
+        return a.controlsSameSession(b);
+    }
+
     /**
      * Hide the album artwork that is fading out and release its bitmap.
      */