+ <ProgressBar
+ android:id="@+id/progressBar"
+ style="@style/Widget.AppCompat.ProgressBar"
+ android:layout_width="wrap_content"
+ android:layout_height="wrap_content"
+ android:layout_marginStart="8dp"
+ android:layout_marginEnd="8dp"
+ android:indeterminate="true"
+ android:indeterminateBehavior="cycle"
+ android:visibility="invisible"
+ app:layout_constraintBottom_toBottomOf="parent"
+ app:layout_constraintEnd_toEndOf="parent"
+ app:layout_constraintStart_toStartOf="parent"
+ app:layout_constraintTop_toTopOf="parent" />
+