Add flag to prevent multiple cap listeners in VSM

Author: joeygrover

android/sdl_android/src/main/java/com/smartdevicelink/managers/video/VideoStreamManager.java

@@ -117,6 +117,7 @@ public class VideoStreamManager extends BaseVideoStreamManager {
     private String vehicleMake = null;
     private boolean isEncrypted = false;
     private boolean withPendingRestart = false;
+    private boolean wasCapabilityListenerAdded = false;
     private AbstractPacketizer videoPacketizer;
 
     // INTERNAL INTERFACES
@@ -188,7 +189,10 @@ public void onNotified(RPCNotification notification) {
                     if (VideoStreamManager.this.parameters == null) {
                         getVideoStreamingParams();
                     }
-                    internalInterface.getSystemCapabilityManager().addOnSystemCapabilityListener(SystemCapabilityType.VIDEO_STREAMING, systemCapabilityListener);
+                    if (!wasCapabilityListenerAdded) {
+                        wasCapabilityListenerAdded = true;
+                        internalInterface.getSystemCapabilityManager().addOnSystemCapabilityListener(SystemCapabilityType.VIDEO_STREAMING, systemCapabilityListener);
+                    }
                 }
                 checkState();
                 if (hasStarted && (isHMIStateVideoStreamCapable(prevOnHMIStatus)) && (!isHMIStateVideoStreamCapable(currentOnHMIStatus))) {