linphone-android/app/src/main/res/layout/voip_chat_fragment.xml

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <data>
        <import type="android.view.View"/>
        <variable
            name="cancelClickListener"
            type="android.view.View.OnClickListener"/>
        <variable
            name="attachFileClickListener"
            type="android.view.View.OnClickListener"/>
        <variable
            name="chatRoomsListClickListener"
            type="android.view.View.OnClickListener"/>
        <variable
            name="viewModel"
            type="org.linphone.activities.main.chat.viewmodels.ChatRoomViewModel" />
        <variable
            name="chatSendingViewModel"
            type="org.linphone.activities.main.chat.viewmodels.ChatMessageSendingViewModel" />
    </data>

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <LinearLayout
            android:id="@+id/top_bar"
            android:layout_width="match_parent"
            android:layout_height="@dimen/voip_top_bar_size"
            android:background="?attr/voipToolbarBackgroundColor"
            android:orientation="horizontal">

            <LinearLayout
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="0.6"
                android:gravity="start|center_vertical"
                android:layout_marginStart="20dp"
                android:orientation="vertical">

                <org.linphone.views.MarqueeTextView
                    android:text="@{viewModel.oneToOneChatRoom ? (viewModel.contact.name ?? viewModel.displayName) : viewModel.subject}"
                    style="@style/toolbar_small_title_font"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:singleLine="true" />

                <org.linphone.views.MarqueeTextView
                    android:text="@{viewModel.participants}"
                    android:visibility="@{viewModel.oneToOneChatRoom ? View.GONE : View.VISIBLE}"
                    style="@style/toolbar_small_title_font"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:singleLine="true" />

            </LinearLayout>

            <ImageView
                android:onClick="@{chatRoomsListClickListener}"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="0.2"
                android:src="@drawable/icon_call_chat_rooms"
                android:contentDescription="@string/content_description_go_to_chat_rooms_list"
                app:layout_constraintEnd_toEndOf="parent"/>

            <ImageView
                android:onClick="@{cancelClickListener}"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="0.2"
                android:padding="10dp"
                android:src="@drawable/icon_cancel"
                android:contentDescription="@string/cancel"
                app:layout_constraintEnd_toEndOf="parent"/>

        </LinearLayout>

        <View
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_below="@id/top_bar"
            android:background="?attr/voipBackgroundBWColor" />

        <LinearLayout
            android:id="@+id/footer"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:background="?attr/backgroundColor"
            android:gravity="center_vertical"
            android:orientation="vertical">

            <include
                layout="@layout/chat_message_reply"
                android:visibility="@{chatSendingViewModel.isPendingAnswer ? View.VISIBLE : View.GONE, default=gone}"
                app:data="@{chatSendingViewModel.pendingChatMessageToReplyTo}"
                app:cancelClickListener="@{() -> chatSendingViewModel.cancelReply()}" />

            <HorizontalScrollView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="?attr/backgroundColor2"
                android:orientation="horizontal">

                <LinearLayout
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:orientation="horizontal"
                    app:entries="@{chatSendingViewModel.attachments}"
                    app:layout="@{@layout/chat_message_attachment_cell}" />

            </HorizontalScrollView>

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:visibility="@{chatSendingViewModel.isReadOnly ? View.GONE : View.VISIBLE}"
                android:gravity="center_vertical"
                android:background="?attr/lightToolbarBackgroundColor"
                android:orientation="horizontal">

                <ImageView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:contentDescription="@string/content_description_attach_file"
                    android:enabled="@{chatSendingViewModel.attachFileEnabled}"
                    android:onClick="@{attachFileClickListener}"
                    android:padding="10dp"
                    android:src="@drawable/chat_file" />

                <EditText
                    android:id="@+id/message"
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center_vertical"
                    android:layout_marginTop="10dp"
                    android:layout_marginBottom="10dp"
                    android:layout_weight="1"
                    android:background="@drawable/resizable_text_field"
                    android:hint="@{chatSendingViewModel.isPendingAnswer ? @string/chat_room_sending_reply_hint : @string/chat_room_sending_message_hint}"
                    android:imeOptions="flagNoExtractUi"
                    android:inputType="textShortMessage|textMultiLine|textAutoComplete|textAutoCorrect|textCapSentences"
                    android:maxLines="6"
                    android:padding="5dp"
                    android:text="@={chatSendingViewModel.textToSend}"
                    android:textColor="@color/black_color"
                    android:textCursorDrawable="@null" />

                <ImageView
                    android:id="@+id/send_message"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:contentDescription="@string/content_description_send_message"
                    android:enabled="@{chatSendingViewModel.sendMessageEnabled}"
                    android:onClick="@{() -> chatSendingViewModel.sendMessage()}"
                    android:padding="10dp"
                    android:src="@drawable/chat_send_message" />

            </LinearLayout>

        </LinearLayout>

        <TextView
            android:id="@+id/remote_composing"
            android:text="@{viewModel.composingList, default=@string/chat_remote_is_composing}"
            android:visibility="@{viewModel.remoteIsComposing ? View.VISIBLE : View.INVISIBLE}"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_above="@id/footer"
            android:layout_marginLeft="5dp"
            style="@style/standard_small_text_font" />

        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/chat_messages_list"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_above="@id/remote_composing"
            android:layout_below="@+id/top_bar"
            android:cacheColorHint="@color/transparent_color"
            android:choiceMode="multipleChoice"
            android:divider="@android:color/transparent"
            android:listSelector="@color/transparent_color"
            android:transcriptMode="normal" />

        <ImageView
            android:src="@{viewModel.securityLevelIcon, default=@drawable/security_alert_indicator}"
            android:visibility="@{viewModel.encryptedChatRoom ? View.VISIBLE : View.GONE}"
            android:contentDescription="@{viewModel.securityLevelContentDescription}"
            android:adjustViewBounds="true"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@id/top_bar"
            android:layout_alignParentRight="true"
            android:layout_marginTop="8dp"
            android:layout_marginRight="8dp" />

    </RelativeLayout>

</layout>