Signal-Android/app/src/main/res/layout/v2_conversation_fragment.xml

<?xml version="1.0" encoding="utf-8"?>
<org.thoughtcrime.securesms.components.InsetAwareConstraintLayout 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">

    <FrameLayout
        android:id="@+id/conversation_video_container"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintBottom_toBottomOf="@id/conversation_item_recycler"
        app:layout_constraintEnd_toEndOf="@+id/conversation_item_recycler"
        app:layout_constraintStart_toStartOf="@+id/conversation_item_recycler"
        app:layout_constraintTop_toTopOf="@+id/conversation_item_recycler" />

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

    <ImageView
        android:id="@+id/conversation_wallpaper"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:importantForAccessibility="no"
        android:scaleType="centerCrop"
        app:layout_constraintEnd_toEndOf="@id/parent_end_guideline"
        app:layout_constraintStart_toStartOf="@id/parent_start_guideline" />

    <View
        android:id="@+id/conversation_wallpaper_dim"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/black"
        android:visibility="gone"
        tools:alpha="0.2f"
        tools:visibility="visible" />

    <org.thoughtcrime.securesms.conversation.mutiselect.MultiselectRecyclerView
        android:id="@+id/conversation_item_recycler"
        android:layout_width="match_parent"
        android:layout_height="0dip"
        android:clipChildren="false"
        android:clipToPadding="false"
        android:overScrollMode="ifContentScrolls"
        android:scrollbars="vertical"
        android:splitMotionEvents="false"
        app:layout_constraintBottom_toTopOf="@id/conversation_bottom_panel_barrier"
        app:layout_constraintTop_toTopOf="parent"
        tools:itemCount="20"
        tools:listitem="@layout/conversation_item_sent_text_only" />

    <org.thoughtcrime.securesms.util.views.DarkOverflowToolbar
        android:id="@+id/toolbar"
        android:layout_width="0dp"
        android:layout_height="@dimen/signal_m3_toolbar_height"
        android:background="@color/transparent"
        android:clipChildren="false"
        android:clipToPadding="false"
        android:minHeight="@dimen/signal_m3_toolbar_height"
        android:theme="?attr/actionBarStyle"
        app:contentInsetStart="46dp"
        app:contentInsetStartWithNavigation="0dp"
        app:layout_constraintEnd_toEndOf="@id/parent_end_guideline"
        app:layout_constraintStart_toStartOf="@id/parent_start_guideline"
        app:layout_constraintTop_toTopOf="@id/status_bar_guideline">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:clipChildren="false"
            android:clipToPadding="false"
            android:orientation="horizontal">

            <include
                android:id="@+id/conversation_title_view"
                layout="@layout/conversation_title_view"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1" />

            <com.google.android.material.button.MaterialButton
                android:id="@+id/conversation_group_call_join"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:fontFamily="sans-serif-medium"
                android:text="@string/ConversationActivity_join"
                android:textAllCaps="false"
                android:textColor="@color/core_white"
                android:visibility="gone"
                app:backgroundTint="@color/core_ultramarine"
                app:cornerRadius="@dimen/material_button_full_round_corner_radius"
                app:icon="@drawable/ic_video_solid_18"
                app:iconGravity="textStart"
                app:iconTint="@color/core_white"
                tools:visibility="visible" />

        </LinearLayout>

    </org.thoughtcrime.securesms.util.views.DarkOverflowToolbar>

    <org.thoughtcrime.securesms.components.ConversationScrollToView
        android:id="@+id/scroll_to_mention"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="10dp"
        android:layout_marginBottom="12dp"
        android:visibility="invisible"
        app:cstv_scroll_button_src="@drawable/ic_at_20"
        app:layout_constraintBottom_toTopOf="@id/scroll_to_bottom"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_goneMarginBottom="20dp"
        tools:visibility="visible" />

    <org.thoughtcrime.securesms.components.ConversationScrollToView
        android:id="@+id/scroll_to_bottom"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="10dp"
        android:layout_marginBottom="16dp"
        android:visibility="invisible"
        app:cstv_scroll_button_src="@drawable/ic_chevron_down_20"
        app:layout_constraintBottom_toTopOf="@id/conversation_bottom_panel_barrier"
        app:layout_constraintEnd_toEndOf="parent"
        tools:visibility="visible" />

    <androidx.constraintlayout.widget.Barrier
        android:id="@+id/conversation_bottom_panel_barrier"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:barrierDirection="top"
        app:constraint_referenced_ids="conversation_input_panel,attachment_editor_stub" />

    <ViewStub
        android:id="@+id/attachment_editor_stub"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:inflatedId="@+id/attachment_editor"
        android:layout="@layout/conversation_activity_attachment_editor_stub"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintBottom_toTopOf="@+id/conversation_input_panel"/>

    <include
        android:id="@+id/conversation_input_panel"
        layout="@layout/conversation_input_panel"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toTopOf="@+id/conversation_input_space_left"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

    <TextView
        android:id="@+id/conversation_input_space_left"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:background="?android:windowBackground"
        android:paddingStart="5dp"
        android:paddingEnd="5dp"
        android:visibility="gone"
        app:layout_constraintBottom_toBottomOf="@id/navigation_bar_guideline"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        tools:text="160/160 (1)"
        tools:visibility="visible" />

</org.thoughtcrime.securesms.components.InsetAwareConstraintLayout>