Mercury-IM/app/src/main/res/layout/activity_chat.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    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=".android.ui.chat.ChatActivity">

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

        <androidx.appcompat.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            tools:menu="@menu/menu_chat" />

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

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toBottomOf="@id/appbar_layout"
        android:paddingBottom="56dp"
        android:clipToPadding="false"
        android:clipChildren="false"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        tools:listitem="@layout/view_message_text_in" />

    <androidx.fragment.app.FragmentContainerView
        android:id="@+id/fragment_compose"
        android:name="org.mercury_im.messenger.android.ui.chat.ChatInputFragment"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="parent"
        tools:layout="@layout/view_compose"/>

</androidx.constraintlayout.widget.ConstraintLayout>