Quelle  activity_group_detail.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:id="@+id/main_content"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="?attr/colorSurface"
    android:fitsSystemWindows="true">

    <com.google.android.material.appbar.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:fitsSystemWindows="true"
        android:importantForAccessibility="no"
        android:theme="@style/ThemeOverlay.Material3.Dark.ActionBar">

        <com.google.android.material.appbar.CollapsingToolbarLayout
            android:id="@+id/collapsing_toolbar"
            style="?attr/collapsingToolbarLayoutLargeStyle"
            android:layout_width="match_parent"
            android:layout_height="@dimen/contact_detail_avatar_height"
            android:fitsSystemWindows="true"
            android:importantForAccessibility="no"
            app:collapsedTitleTextColor="@android:color/white"
            app:contentScrim="?attr/colorPrimary"
            app:layout_scrollFlags="scroll|exitUntilCollapsed"
            tools:background="@android:color/holo_red_light">

            <ch.threema.app.ui.AvatarEditView
                android:id="@+id/avatar_edit_view"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:contentDescription="@string/profile_picture"
                android:fitsSystemWindows="true"
                android:importantForAccessibility="no"
                app:layout_collapseMode="parallax" />

            <ch.threema.app.emojis.EmojiEditText
                android:id="@+id/group_title"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_gravity="bottom|left"
                android:layout_marginHorizontal="@dimen/grid_unit_x2"
                android:layout_marginBottom="@dimen/grid_unit_x4"
                android:background="@drawable/bubble_compose_dark_outline"
                android:imeOptions="actionDone"
                android:maxLines="1"
                android:scrollHorizontally="true"
                android:singleLine="true"
                android:textAppearance="@style/Threema.TextAppearance.DetailTitle"
                app:layout_anchor="@id/appbar"
                app:layout_anchorGravity="bottom|left"
                tools:text="Group Name" />

            <View
                android:layout_width="match_parent"
                android:layout_height="16dp"
                android:layout_gravity="bottom"
                android:background="@drawable/shape_detail" />

            <com.google.android.material.appbar.MaterialToolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                app:layout_collapseMode="pin"
                tools:menu="@menu/activity_group_detail"
                tools:navigationIcon="@drawable/ic_arrow_back_24">

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

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

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

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/group_members_list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginHorizontal="@dimen/grid_unit_x2"
        android:clipToPadding="false"
        android:importantForAccessibility="no"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        tools:listitem="@layout/item_group_detail" />

    <com.google.android.material.floatingactionbutton.ExtendedFloatingActionButton
        android:id="@+id/floating"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|right|end"
        android:layout_marginRight="@dimen/grid_unit_x2"
        android:layout_marginBottom="@dimen/grid_unit_x2"
        android:clickable="true"
        android:focusable="true"
        android:text="@string/apply_changes"
        app:icon="@drawable/ic_check" />

</androidx.coordinatorlayout.widget.CoordinatorLayout>