Call onServiceConnected only after callback is saved in the service.

Prevent the onServiceConnected to be called prematurely. Until now
it was called in the manager and so that a client may rely on the
callback being called before it was actually available to the service
to use.

Bug: 293511169
Test: atest android.net.wifi.sharedconnectivity.cts
Change-Id: I698378a057990bd8ea73974130fa29ab1cd7c738

wifi/java/src/android/net/wifi/sharedconnectivity/app/SharedConnectivityManager.java

@@ -81,6 +81,19 @@ public class SharedConnectivityManager {
             mCallback = callback;
         }
 
+        @Override
+        public void onServiceConnected() {
+            if (mCallback != null) {
+                final long token = Binder.clearCallingIdentity();
+                try {
+                    mExecutor.execute(() -> mCallback.onServiceConnected());
+                } finally {
+                    Binder.restoreCallingIdentity(token);
+                }
+            }
+        }
+
+        @Override
         public void onHotspotNetworksUpdated(@NonNull List<HotspotNetwork> networks) {
             if (mCallback != null) {
                 final long token = Binder.clearCallingIdentity();
@@ -117,6 +130,7 @@ public class SharedConnectivityManager {
             }
         }
 
+        @Override
         public void onHotspotNetworkConnectionStatusChanged(
                 @NonNull HotspotNetworkConnectionStatus status) {
             if (mCallback != null) {
@@ -251,7 +265,6 @@ public class SharedConnectivityManager {
             synchronized (mProxyDataLock) {
                 mProxyMap.put(callback, proxy);
             }
-            callback.onServiceConnected();
         } catch (RemoteException e) {
             Log.e(TAG, "Exception in registerCallback", e);
             callback.onRegisterCallbackFailed(e);

wifi/java/src/android/net/wifi/sharedconnectivity/service/ISharedConnectivityCallback.aidl

@@ -31,4 +31,5 @@ interface ISharedConnectivityCallback {
     oneway void onKnownNetworksUpdated(in List<KnownNetwork> networks);
     oneway void onKnownNetworkConnectionStatusChanged(in KnownNetworkConnectionStatus status);
     oneway void onSharedConnectivitySettingsChanged(in SharedConnectivitySettingsState state);
+    oneway void onServiceConnected();
 }

wifi/java/src/android/net/wifi/sharedconnectivity/service/SharedConnectivityService.java

@@ -276,6 +276,11 @@ public abstract class SharedConnectivityService extends Service {
 
     private void onRegisterCallback(ISharedConnectivityCallback callback) {
         mRemoteCallbackList.register(callback);
+        try {
+            callback.onServiceConnected();
+        } catch (RemoteException e) {
+            if (DEBUG) Log.w(TAG, "Exception in onRegisterCallback", e);
+        }
         if (mCountDownLatch != null) {
             mCountDownLatch.countDown();
         }