Fix ImsManager double callback registration

MMTelFeature has two ways of registering registration callbacks,
through startSession and addRegistrationListener. startSession
requires a registration listener, which can cause double
registration if addRegistrationListener happens before
startSession in ImsManager.

This fix temporarily solves that problem by registering a Stub
implementation of the registration callback in startSession.
This will be fixed later by modifying the MMTelFeature
APIs to remove the registration listener from the arg list.

Bug: 62207372
Test: Telephony unit tests and manual IMS registration
Change-Id: I00fdbae1baaf77cca5156a442ea109f998a8d5a5

1 files changed, 69 insertions, 7 deletions

diff --git a/src/java/com/android/ims/ImsManager.java b/src/java/com/android/ims/ImsManager.java
index f7753a8a..328f393c 100644
--- a/src/java/com/android/ims/ImsManager.java
+++ b/src/java/com/android/ims/ImsManager.java
@@ -1504,12 +1504,14 @@ public class ImsManager {
         int result = 0;
 
         try {
+            // Register a stub implementation of the ImsRegistrationListener. There is the
+            // possibility that if we use the real implementation of the ImsRegistrationListener,
+            // it will be added twice.
+            // TODO: Remove ImsRegistrationListener from startSession API (b/62588776)
             result = mImsServiceProxy.startSession(incomingCallPendingIntent,
-                    mRegistrationListenerProxy);
-            synchronized (mHasRegisteredLock) {
-                mHasRegisteredForProxy = true;
-                addRegistrationListener(listener);
-            }
+                    new ImsRegistrationListenerBase());
+            addRegistrationListener(listener);
+            log("open: Session started and registration listener added.");
         } catch (RemoteException e) {
             throw new ImsException("open()", e,
                     ImsReasonInfo.CODE_LOCAL_IMS_SERVICE_DOWN);
@@ -1550,16 +1552,17 @@ public class ImsManager {
      */
     public void addRegistrationListener(ImsConnectionStateListener listener)
             throws ImsException {
-        checkAndThrowExceptionIfServiceUnavailable();
 
         if (listener == null) {
             throw new NullPointerException("listener can't be null");
         }
-        // We only want this Proxy registered once. It can either happen here or in open().
+        // We only want this Proxy registered once.
         synchronized (mHasRegisteredLock) {
             if (!mHasRegisteredForProxy) {
                 try {
+                    checkAndThrowExceptionIfServiceUnavailable();
                     mImsServiceProxy.addRegistrationListener(mRegistrationListenerProxy);
+                    log("RegistrationListenerProxy registered.");
                     // Only record if there isn't a RemoteException.
                     mHasRegisteredForProxy = true;
                 } catch (RemoteException e) {
@@ -1569,6 +1572,7 @@ public class ImsManager {
             }
         }
         synchronized (mRegistrationListeners) {
+            log("Local registration listener added: " + listener);
             mRegistrationListeners.add(listener);
         }
     }
@@ -1588,6 +1592,7 @@ public class ImsManager {
         }
 
         synchronized (mRegistrationListeners) {
+            log("Local registration listener removed: " + listener);
             mRegistrationListeners.remove(listener);
         }
     }
@@ -2217,6 +2222,63 @@ public class ImsManager {
     }
 
     /**
+     * Stub implementation of the Registration listener that provides no functionality.
+     */
+    private class ImsRegistrationListenerBase extends IImsRegistrationListener.Stub {
+
+        @Override
+        public void registrationConnected() throws RemoteException {
+        }
+
+        @Override
+        public void registrationProgressing() throws RemoteException {
+        }
+
+        @Override
+        public void registrationConnectedWithRadioTech(int imsRadioTech) throws RemoteException {
+        }
+
+        @Override
+        public void registrationProgressingWithRadioTech(int imsRadioTech) throws RemoteException {
+        }
+
+        @Override
+        public void registrationDisconnected(ImsReasonInfo imsReasonInfo) throws RemoteException {
+        }
+
+        @Override
+        public void registrationResumed() throws RemoteException {
+        }
+
+        @Override
+        public void registrationSuspended() throws RemoteException {
+        }
+
+        @Override
+        public void registrationServiceCapabilityChanged(int serviceClass, int event)
+                throws RemoteException {
+        }
+
+        @Override
+        public void registrationFeatureCapabilityChanged(int serviceClass, int[] enabledFeatures,
+                int[] disabledFeatures) throws RemoteException {
+        }
+
+        @Override
+        public void voiceMessageCountUpdate(int count) throws RemoteException {
+        }
+
+        @Override
+        public void registrationAssociatedUriChanged(Uri[] uris) throws RemoteException {
+        }
+
+        @Override
+        public void registrationChangeFailed(int targetAccessTech, ImsReasonInfo imsReasonInfo)
+                throws RemoteException {
+        }
+    }
+
+    /**
      * Adapter class for {@link IImsRegistrationListener}.
      */
     private class ImsRegistrationListenerProxy extends IImsRegistrationListener.Stub {