linphone-android/app/src/main/res/layout/chat_bubble_activity.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="closeBubbleClickListener"
            type="android.view.View.OnClickListener"/>
        <variable
            name="openAppClickListener"
            type="android.view.View.OnClickListener"/>
        <variable
            name="sendMessageClickListener"
            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"
        android:background="?attr/backgroundColor">

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

            <ImageView
                android:contentDescription="@string/content_description_close_bubble"
                android:onClick="@{closeBubbleClickListener}"
                android:visibility="invisible"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="0.2"
                android:padding="15dp"
                android:background="?attr/button_background_drawable"
                android:src="@drawable/collapse_default"
                app:tint="?attr/drawableTintColor" />

            <LinearLayout
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_gravity="center"
                android:layout_weight="0.4"
                android:gravity="center"
                android:orientation="vertical"
                android:paddingLeft="5dp">

                <org.linphone.views.MarqueeTextView
                    android:text="@{viewModel.oneToOneChatRoom ? (viewModel.contact.fullName ?? 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="@{openAppClickListener}"
                android:contentDescription="@string/content_description_open_app"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="0.2"
                android:padding="15dp"
                android:background="?attr/button_background_drawable"
                app:tint="?attr/drawableTintColor"
                android:src="@drawable/fullscreen_default"/>

        </LinearLayout>

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

            <org.linphone.activities.main.chat.views.RichEditText
                android:id="@+id/message"
                android:enabled="@{!chatSendingViewModel.isReadOnly}"
                android:text="@={chatSendingViewModel.textToSend}"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_gravity="center_vertical"
                android:layout_marginTop="5dp"
                android:layout_marginBottom="5dp"
                android:layout_marginLeft="5dp"
                android:layout_weight="1"
                android:background="@drawable/resizable_text_field"
                android:imeOptions="flagNoExtractUi"
                android:inputType="textShortMessage|textMultiLine|textAutoComplete|textAutoCorrect|textCapSentences"
                android:maxLines="6"
                android:padding="5dp"
                android:textColor="@color/black_color"
                android:textCursorDrawable="@null" />

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

                <ImageView
                    android:id="@+id/send_message"
                    android:onClick="@{sendMessageClickListener}"
                    android:enabled="@{chatSendingViewModel.sendMessageEnabled &amp;&amp; !chatSendingViewModel.isReadOnly}"
                    android:contentDescription="@string/content_description_send_message"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:padding="5dp"
                    android:src="@drawable/chat_send_message" />

                <ImageView
                    android:visibility="@{viewModel.chatRoom.ephemeralEnabled() ? View.VISIBLE : View.GONE, default=gone}"
                    android:enabled="@{chatSendingViewModel.sendMessageEnabled &amp;&amp; !chatSendingViewModel.isReadOnly}"
                    android:contentDescription="@string/content_description_ephemeral_message"
                    android:clickable="false"
                    android:layout_width="20dp"
                    android:layout_height="wrap_content"
                    android:adjustViewBounds="true"
                    android:layout_alignRight="@id/send_message"
                    android:layout_alignBottom="@id/send_message"
                    android:padding="5dp"
                    android:src="@drawable/ephemeral_messages" />

            </RelativeLayout>

        </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>