Quelle  activity_message_details.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/parent_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="?android:attr/colorBackground"
    android:orientation="vertical">

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

        <FrameLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <com.google.android.material.appbar.MaterialToolbar
                android:id="@+id/material_toolbar"
                style="@style/Threema.ToolbarStyle"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                app:menu="@menu/activity_message_details"
                app:navigationIcon="?attr/homeAsUpIndicator" />

            <include layout="@layout/connection_indicator" />

        </FrameLayout>

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

    <androidx.compose.ui.platform.ComposeView
        android:id="@+id/message_details_compose_view"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />

</LinearLayout>