fix timer issue

android/app/src/main/kotlin/com/hmg/hmgDr/ui/fragment/VideoCallFragment.kt

@@ -546,16 +546,27 @@ class VideoCallFragment : DialogFragment(), PermissionCallbacks, Session.Session
                     400,
                     600
             )
-            (mSubscriber!!.renderer as DynamicVideoRenderer).enableThumbnailCircle(false)
         } else {
             dialog?.window?.setLayout(
                     300,
                     300
             )
-            (mSubscriber!!.renderer as DynamicVideoRenderer).enableThumbnailCircle(true)
         }
         isCircle = !isCircle
 
+        if (mSubscriber != null) {
+            (mSubscriber!!.renderer as DynamicVideoRenderer).enableThumbnailCircle(isCircle)
+        } else {
+            if (isCircle) {
+                videoCallContainer.background = ContextCompat.getDrawable(requireContext(), R.drawable.circle_shape)
+                mSubscriberViewContainer.background = ContextCompat.getDrawable(requireContext(), R.drawable.circle_shape)
+            } else {
+                videoCallContainer.setBackgroundColor(ContextCompat.getColor(requireContext(), R.color.text_color))
+                mSubscriberViewContainer.setBackgroundColor(ContextCompat.getColor(requireContext(), R.color.text_color))
+            }
+
+        }
+
         if (isCircle) {
             controlPanel.visibility = View.GONE
             layoutMini.visibility = View.GONE