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

<?xml version="1.0" encoding="utf-8"?>
<org.thoughtcrime.securesms.components.InputPanel 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/bottom_panel"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/signal_background_primary"
    android:clipChildren="false"
    android:clipToPadding="false">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/input_panel_sticker_suggestion"
        android:layout_width="0dp"
        android:layout_height="90dp"
        android:background="@color/signal_background_secondary"
        android:orientation="horizontal"
        android:visibility="gone"
        app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:visibility="visible" />

    <androidx.appcompat.widget.AppCompatImageButton
        android:id="@+id/input_panel_exit_edit_mode"
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:layout_marginStart="14dp"
        android:layout_marginEnd="12dp"
        android:layout_marginBottom="2dp"
        android:background="@drawable/circle_tintable"
        android:backgroundTint="@color/signal_colorOnSurfaceVariant"
        android:foreground="?attr/selectableItemBackgroundBorderless"
        android:scaleType="center"
        android:visibility="gone"
        app:layout_constraintBottom_toBottomOf="@id/compose_bubble"
        app:layout_constraintStart_toStartOf="parent"
        app:srcCompat="@drawable/symbol_x_24"
        app:tint="@color/signal_colorOnPrimary"
        tools:visibility="gone" />

    <View
        android:id="@id/compose_bubble"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="12dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="12dp"
        android:layout_marginBottom="8dp"
        android:background="@drawable/compose_background"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/button_toggle"
        app:layout_constraintStart_toEndOf="@id/input_panel_exit_edit_mode"
        app:layout_constraintTop_toBottomOf="@id/input_panel_sticker_suggestion" />

    <androidx.appcompat.widget.AppCompatTextView
        android:id="@+id/edit_message_title"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginTop="12dp"
        android:layout_marginEnd="8dp"
        android:drawablePadding="6dp"
        android:text="@string/InputPanel_edit_message"
        android:textAppearance="@style/Signal.Text.LabelLarge"
        android:textColor="@color/signal_colorOnSurface"
        android:visibility="gone"
        app:drawableStartCompat="@drawable/symbol_edit_compact_16"
        app:drawableTint="@color/signal_colorOnSurface"
        app:layout_constraintEnd_toStartOf="@+id/edit_message_thumbnail"
        app:layout_constraintStart_toStartOf="@id/compose_bubble"
        app:layout_constraintTop_toTopOf="@id/compose_bubble"
        tools:visibility="visible" />

    <com.google.android.material.imageview.ShapeableImageView
        android:id="@+id/edit_message_thumbnail"
        android:layout_width="20dp"
        android:layout_height="20dp"
        android:layout_marginEnd="16dp"
        android:visibility="gone"
        app:layout_constraintBottom_toBottomOf="@id/edit_message_title"
        app:layout_constraintEnd_toEndOf="@id/compose_bubble"
        app:layout_constraintStart_toEndOf="@id/edit_message_title"
        app:layout_constraintTop_toTopOf="@id/edit_message_title"
        app:shapeAppearanceOverlay="@style/ShapeAppearanceOverlay.Signal.EditMessageMediaThumbnail"
        tools:src="@tools:sample/avatars"
        tools:visibility="visible" />

    <org.thoughtcrime.securesms.components.QuoteView
        android:id="@+id/quote_view"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginHorizontal="6dp"
        android:layout_marginTop="6dp"
        android:visibility="gone"
        app:layout_constraintEnd_toEndOf="@+id/compose_bubble"
        app:layout_constraintStart_toStartOf="@+id/compose_bubble"
        app:layout_constraintTop_toBottomOf="@+id/edit_message_title"
        app:message_type="preview"
        app:quote_colorPrimary="@color/signal_text_primary"
        app:quote_colorSecondary="@color/signal_text_primary"
        tools:visibility="visible" />

    <org.thoughtcrime.securesms.components.LinkPreviewView
        android:id="@+id/link_preview"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginHorizontal="6dp"
        android:layout_marginTop="6dp"
        android:visibility="gone"
        app:layout_constraintEnd_toEndOf="@+id/compose_bubble"
        app:layout_constraintStart_toStartOf="@+id/compose_bubble"
        app:layout_constraintTop_toBottomOf="@+id/quote_view"
        app:linkpreview_type="compose" />

    <androidx.constraintlayout.widget.Barrier
        android:id="@+id/compose_bubble_top_elements"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        app:barrierDirection="bottom"
        app:constraint_referenced_ids="edit_message_title,edit_message_thumbnail,quote_view,link_preview" />

    <org.thoughtcrime.securesms.components.emoji.EmojiToggle
        android:id="@+id/emoji_toggle"
        android:layout_width="wrap_content"
        android:layout_height="@dimen/conversation_compose_height"
        android:layout_gravity="bottom"
        android:background="@null"
        android:contentDescription="@string/conversation_activity__emoji_toggle_description"
        android:foreground="?attr/selectableItemBackgroundBorderless"
        android:paddingStart="12dp"
        android:paddingEnd="12dp"
        app:layout_constraintBottom_toBottomOf="@id/compose_bubble"
        app:layout_constraintStart_toStartOf="@id/compose_bubble"
        app:layout_constraintTop_toBottomOf="@id/compose_bubble_top_elements"
        app:tint="@color/signal_colorOnSurfaceVariant" />

    <org.thoughtcrime.securesms.components.ComposeText
        android:id="@+id/embedded_text_editor"
        style="@style/ComposeEditText"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
        android:minHeight="@dimen/conversation_compose_height"
        android:nextFocusRight="@+id/send_button"
        android:nextFocusForward="@+id/send_button"
        android:paddingVertical="8dp"
        app:layout_constraintBottom_toBottomOf="@id/compose_bubble"
        app:layout_constraintEnd_toStartOf="@id/attachment_barrier"
        app:layout_constraintStart_toEndOf="@id/emoji_toggle"
        app:layout_constraintTop_toBottomOf="@id/compose_bubble_top_elements"
        tools:hint="Send TextSecure message">

        <requestFocus />
    </org.thoughtcrime.securesms.components.ComposeText>

    <androidx.constraintlayout.widget.Barrier
        android:id="@+id/attachment_barrier"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:barrierDirection="start"
        app:constraint_referenced_ids="quick_attachment_toggle,inline_attachment_container" />

    <org.thoughtcrime.securesms.components.HidingLinearLayout
        android:id="@+id/quick_attachment_toggle"
        android:layout_width="wrap_content"
        android:layout_height="0dp"
        android:layout_gravity="right|end"
        android:clipChildren="false"
        android:clipToPadding="false"
        app:layout_constraintBottom_toBottomOf="@id/compose_bubble"
        app:layout_constraintEnd_toEndOf="@id/compose_bubble"
        app:layout_constraintTop_toBottomOf="@id/compose_bubble_top_elements">

        <ImageButton
            android:id="@+id/quick_camera_toggle"
            android:layout_width="24dp"
            android:layout_height="match_parent"
            android:layout_gravity="center_vertical"
            android:layout_marginEnd="16dp"
            android:background="@null"
            android:contentDescription="@string/conversation_activity__quick_attachment_drawer_toggle_camera_description"
            android:foreground="?selectableItemBackgroundBorderless"
            android:scaleType="fitCenter"
            app:srcCompat="@drawable/ic_camera_24"
            app:tint="@color/signal_colorOnSurfaceVariant" />

        <org.thoughtcrime.securesms.components.MicrophoneRecorderView
            android:id="@+id/recorder_view"
            android:layout_width="24dp"
            android:layout_height="match_parent"
            android:layout_gravity="center_vertical"
            android:layout_marginEnd="12dp"
            android:clipChildren="false"
            android:clipToPadding="false"
            tools:visibility="gone">

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

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

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

    <org.thoughtcrime.securesms.components.HidingLinearLayout
        android:id="@+id/inline_attachment_container"
        android:layout_width="wrap_content"
        android:layout_height="0dp"
        android:layout_gravity="right|end"
        android:visibility="gone"
        app:layout_constraintBottom_toBottomOf="@id/compose_bubble"
        app:layout_constraintEnd_toEndOf="@id/compose_bubble"
        app:layout_constraintTop_toBottomOf="@id/compose_bubble_top_elements">

        <ImageButton
            android:id="@+id/inline_attachment_button"
            android:layout_width="24dp"
            android:layout_height="@dimen/conversation_compose_height"
            android:layout_gravity="bottom"
            android:layout_marginEnd="12dp"
            android:background="?selectableItemBackgroundBorderless"
            android:contentDescription="@string/ConversationActivity_add_attachment"
            android:scaleType="fitCenter"
            app:srcCompat="@drawable/ic_plus_24"
            app:tint="@color/signal_colorOnSurface" />

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

    <include
        layout="@layout/recording_layout"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="@id/compose_bubble"
        app:layout_constraintEnd_toEndOf="@id/compose_bubble"
        app:layout_constraintStart_toStartOf="@id/compose_bubble"
        app:layout_constraintTop_toBottomOf="@id/compose_bubble_top_elements"
        tools:visibility="gone" />

    <org.thoughtcrime.securesms.conversation.VoiceNoteDraftView
        android:id="@+id/voice_note_draft_view"
        android:layout_width="0dp"
        android:layout_height="@dimen/conversation_compose_height"
        android:visibility="gone"
        app:layout_constraintBottom_toBottomOf="@id/compose_bubble"
        app:layout_constraintEnd_toEndOf="@id/compose_bubble"
        app:layout_constraintStart_toStartOf="@id/compose_bubble"
        app:layout_constraintTop_toBottomOf="@id/compose_bubble_top_elements"
        tools:visibility="gone" />

    <org.thoughtcrime.securesms.components.AnimatingToggle
        android:id="@+id/button_toggle"
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:layout_gravity="bottom"
        android:layout_marginTop="2dp"
        android:layout_marginEnd="14dp"
        android:layout_marginBottom="2dp"
        android:background="@drawable/circle_tintable"
        app:layout_constraintBottom_toBottomOf="@id/compose_bubble"
        app:layout_constraintEnd_toEndOf="parent">

        <ImageButton
            android:id="@+id/attach_button"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_gravity="center"
            android:background="@drawable/circle_touch_highlight_background"
            android:contentDescription="@string/ConversationActivity_add_attachment"
            android:nextFocusLeft="@+id/embedded_text_editor"
            android:padding="9dp"
            android:scaleType="fitCenter"
            app:srcCompat="@drawable/symbol_plus_24"
            app:tint="@color/conversation_send_button_tint" />

        <ImageButton
            android:id="@+id/send_edit_button"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_gravity="center"
            android:background="@drawable/circle_touch_highlight_background"
            android:contentDescription="@string/ConversationActivity_send_edit"
            android:nextFocusLeft="@+id/embedded_text_editor"
            android:padding="9dp"
            android:scaleType="fitCenter"
            app:srcCompat="@drawable/symbol_check_24"
            app:tint="@color/conversation_send_button_tint" />

        <org.thoughtcrime.securesms.components.SendButton
            android:id="@+id/send_button"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@drawable/circle_touch_highlight_background"
            android:contentDescription="@string/conversation_activity__send"
            android:nextFocusLeft="@+id/embedded_text_editor"
            android:padding="9dp"
            android:scaleType="fitCenter"
            app:srcCompat="@drawable/ic_send_unlock_24"
            app:tint="@color/conversation_send_button_tint" />

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

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