linphone-android/app/src/main/res/layout/operation_in_progress.xml

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <data>
        <import type="android.view.View"/>
        <variable
            name="visibility"
            type="Boolean" />
    </data>

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:visibility="@{visibility ? View.VISIBLE : View.GONE}"
        android:background="@color/dialog_background">

        <com.google.android.material.progressindicator.CircularProgressIndicator
            android:id="@+id/progress"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            app:indicatorColor="@color/primary_color"
            android:indeterminate="true" />

        <androidx.appcompat.widget.AppCompatTextView
            style="@style/default_text_style_800"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/operation_in_progress_overlay"
            android:textColor="@color/primary_color"
            android:textSize="18sp"
            android:layout_below="@id/progress"
            android:layout_centerHorizontal="true"/>

    </RelativeLayout>

</layout>