Add connection loader

vector/src/main/java/im/vector/riotx/features/call/VectorCallActivity.kt

@@ -224,6 +224,7 @@ class VectorCallActivity : VectorBaseActivity(), CallControlsView.InteractionLis
 
         callControlsView.updateForState(state)
         val callState = state.callState.invoke()
+        callConnectingProgress.isVisible = false
         when (callState) {
             is CallState.Idle,
             is CallState.Dialing      -> {
@@ -244,6 +245,7 @@ class VectorCallActivity : VectorBaseActivity(), CallControlsView.InteractionLis
                 callVideoGroup.isInvisible = true
                 callInfoGroup.isVisible = true
                 callStatusText.setText(R.string.call_connecting)
+                callConnectingProgress.isVisible = true
                 configureCallInfo(state)
             }
             is CallState.Connected    -> {
@@ -264,6 +266,7 @@ class VectorCallActivity : VectorBaseActivity(), CallControlsView.InteractionLis
                     callInfoGroup.isVisible = true
                     configureCallInfo(state)
                     callStatusText.setText(R.string.call_connecting)
+                    callConnectingProgress.isVisible = true
                 }
                 // ensure all attached?
                 peerConnectionManager.attachViewRenderers(pipRenderer, fullscreenRenderer, null)

vector/src/main/res/layout/activity_call.xml

@@ -3,9 +3,9 @@
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/constraintLayout"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:id="@+id/constraintLayout"
     android:background="?riotx_background"
     tools:ignore="MergeRootFrame">
 
@@ -73,6 +73,18 @@
         app:layout_constraintTop_toBottomOf="@id/otherMemberAvatar"
         tools:text="Connecting..." />
 
+    <ProgressBar
+        android:id="@+id/callConnectingProgress"
+        style="?android:attr/progressBarStyle"
+        android:layout_width="20dp"
+        android:layout_height="20dp"
+        android:layout_margin="8dp"
+        android:visibility="gone"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/callStatusText"
+        tools:visibility="visible" />
+
     <androidx.constraintlayout.widget.Group
         android:id="@+id/callInfoGroup"
         android:layout_width="wrap_content"