Also rely on enabled notification listeners for RemoteController registration

Registration of a RemoteController may succeed only if:
 - the caller has the MEDIA_CONTENT_CONTROL permission,
 - or if the RemoteController.OnClientUpdateListener it
   registers if one of the enabled notification listeners.

For using the "enabled notification listener" functionality,
 the CL involved:
 - making OnClientUpdateListener an interface so a 3rd-party
   application may have its implementation extend
   NotificationListenerService, which is required for a
   listener to be enabled by the user.
 - add the concept of "enabled" status in an
   IRemoteControlDisplay, so a RemoteController (which
   encapsulates the IRemoteControlDisplay implementation)
   may be registered, but later temporarily disabled by
   the user, as a result of a user action in the security
   settings, or a user switch.
 - making MediaFocusControl, the component tied to
   AudioService, monitor changes in enabled notification
   listeners, and act upon enable/disable changes.

Bug 8209392

Change-Id: Ia8dfa2156c65668b2b0d4ae92048005912652d84

1 files changed, 5 insertions, 0 deletions

diff --git a/cmds/media/src/com/android/commands/media/Media.java b/cmds/media/src/com/android/commands/media/Media.java
index 56af7d6..92c6a51 100644
--- a/cmds/media/src/com/android/commands/media/Media.java
+++ b/cmds/media/src/com/android/commands/media/Media.java
@@ -140,6 +140,11 @@ public class Media extends BaseCommand {
         }
 
         @Override
+        public void setEnabled(boolean enabled) {
+            System.out.println("New enable state= " + (enabled ? "enabled" : "disabled"));
+        }
+
+        @Override
         public void setPlaybackState(int generationId, int state, long stateChangeTimeMs,
                 long currentPosMs, float speed) {
             System.out.println("New state: id=" + generationId + " state=" + state