ring-android/app/src/main/res/layout/activity_conversation.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout
    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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".client.ConversationActivity">

    <com.google.android.material.appbar.AppBarLayout
        android:id="@+id/toolbar_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toTopOf="parent">

    <com.google.android.material.appbar.MaterialToolbar
        android:id="@+id/main_toolbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true"
        android:elevation="4dp"
        android:height="?attr/actionBarSize"
        style="@style/Widget.MaterialComponents.Toolbar.Surface"
        app:titleTextAppearance="@style/TextAppearance.MaterialComponents.Body1"
        app:subtitleTextAppearance="@style/TextAppearance.MaterialComponents.Subtitle1"
        app:contentInsetStart="72dp"
        app:elevation="4dp"
        app:titleMarginStart="24dp"
        tools:title="Adrien"
        tools:subtitle="adrienberaud"
        tools:navigationIcon="@drawable/baseline_person_24" />

    </com.google.android.material.appbar.AppBarLayout>

    <FrameLayout
        android:id="@+id/main_frame"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/main_toolbar"
        android:layout_alignParentStart="true"/>
</androidx.coordinatorlayout.widget.CoordinatorLayout>