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

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
        android:id="@+id/top_bar"
        android:layout_width="match_parent"
        android:layout_height="60dp"
        android:background="?attr/lighToolbarBackgroundColor"
        android:orientation="horizontal">

        <ImageView
            android:id="@+id/back"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="0.2"
            android:background="?attr/button_background_drawable"
            android:contentDescription="@string/content_description_back"
            android:padding="18dp"
            android:src="@drawable/back" />

        <TextView
            android:id="@+id/title"
            style="@style/toolbar_small_title_font"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="0.8"
            android:gravity="center"
            android:padding="15dp"
            android:ellipsize="end"
            android:singleLine="true"
            android:text="@string/group_chat_room_devices" />

    </LinearLayout>

    <ExpandableListView
        android:id="@+id/devices_list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/top_bar"
        android:divider="?attr/dividerColor"
        android:childDivider="?attr/dividerColor"
        android:dividerHeight="1dp"
        android:groupIndicator="@null" />

</RelativeLayout>