ring-android/app/src/main/res/layout/frag_conversation.xml

<?xml version="1.0" encoding="utf-8"?>
<layout 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">

    <data>

        <variable
            name="presenter"
            type="cx.ring.fragments.ConversationFragment" />
    </data>

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/grey_25">

        <ProgressBar
            android:id="@+id/pb_loading"
            android:layout_width="64dp"
            android:layout_height="64dp"
            android:layout_centerInParent="true"
            android:indeterminate="true" />

        <LinearLayout
            android:id="@+id/trustRequestMessageLayout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:orientation="vertical"
            android:visibility="gone">

            <TextView
                android:id="@+id/tvTrustRequestMessage"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="@color/white"
                android:gravity="center"
                android:padding="30dp"
                tools:text="Jean is not in your contacts yet" />

            <View
                android:layout_width="match_parent"
                android:layout_height="1dp"
                android:background="@color/lighter_gray" />

        </LinearLayout>

        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/hist_list"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_below="@+id/trustRequestMessageLayout"
            android:layout_alignParentStart="true"
            android:layout_alignParentEnd="true"
            android:layout_alignParentBottom="true"
            android:clipToPadding="false"
            android:divider="@null"
            android:listSelector="@color/transparent"
            android:paddingTop="8dp"
            android:paddingBottom="60dp"
            android:transcriptMode="normal"
            app:layoutManager="LinearLayoutManager"
            app:stackFromEnd="true"
            tools:listitem="@layout/item_conv_msg_peer" />

        <LinearLayout
            android:id="@+id/ongoingcall_pane"
            android:layout_width="match_parent"
            android:layout_height="48dp"
            android:layout_below="@id/main_toolbar"
            android:background="#e3c1c1"
            android:gravity="center"
            android:onClick="@{() -> presenter.onClick()}"
            android:visibility="gone">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_margin="10dp"
                android:text="@string/conversation_action_go_to_call"
                android:textAppearance="?android:attr/textAppearanceMedium"
                android:textColor="@color/text_color_primary" />
        </LinearLayout>

        <androidx.cardview.widget.CardView
            android:id="@+id/unknownContactPrompt"
            style="?android:attr/buttonBarStyle"
            android:layout_width="match_parent"
            android:layout_height="42dp"
            android:layout_alignParentBottom="true"
            android:layout_marginLeft="8dp"
            android:layout_marginRight="8dp"
            android:layout_marginBottom="12dp"
            android:padding="0dp"
            android:visibility="gone"
            app:cardBackgroundColor="#4CAF50"
            app:cardCornerRadius="@dimen/radius_message_input">

            <Button
                android:id="@+id/btnAddContact"
                style="@style/Widget.MaterialComponents.Button.TextButton"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_margin="0dp"
                android:background="?attr/selectableItemBackground"
                android:gravity="center"
                android:onClick="@{() -> presenter.addContact()}"
                android:padding="0dp"
                android:text="@string/ab_action_contact_add"
                android:textColor="@color/white" />
        </androidx.cardview.widget.CardView>

        <androidx.cardview.widget.CardView
            android:id="@+id/trustRequestPrompt"
            style="?android:attr/buttonBarStyle"
            android:layout_width="match_parent"
            android:layout_height="42dp"
            android:layout_alignParentBottom="true"
            android:layout_marginLeft="8dp"
            android:layout_marginRight="8dp"
            android:layout_marginBottom="12dp"
            android:padding="0dp"
            android:visibility="gone"
            app:cardCornerRadius="@dimen/radius_message_input">

            <LinearLayout
                style="?android:attr/buttonBarStyle"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_margin="0dp"
                android:orientation="horizontal"
                android:padding="0dp"
                android:weightSum="3">

                <Button
                    android:id="@+id/btnBlock"
                    style="@style/Widget.MaterialComponents.Button.TextButton"
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_weight="1"
                    android:background="?attr/selectableItemBackground"
                    android:gravity="center"
                    android:onClick="@{() -> presenter.blockContactRequest()}"
                    android:text="@string/block"
                    android:textColor="@color/color_primary_dark" />

                <Button
                    android:id="@+id/btnRefuse"
                    style="@style/Widget.MaterialComponents.Button.TextButton"
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_weight="1"
                    android:background="?attr/selectableItemBackground"
                    android:gravity="center"
                    android:onClick="@{() -> presenter.refuseContactRequest()}"
                    android:text="@string/refuse"
                    android:textColor="@color/color_primary_dark" />

                <Button
                    android:id="@+id/btnAccept"
                    style="@style/Widget.MaterialComponents.Button.TextButton"
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_weight="1"
                    android:background="?attr/selectableItemBackground"
                    android:gravity="center"
                    android:onClick="@{() -> presenter.acceptContactRequest()}"
                    android:text="@string/accept"
                    android:textColor="#4CAF50" />
            </LinearLayout>
        </androidx.cardview.widget.CardView>

        <androidx.cardview.widget.CardView
            android:id="@+id/cvMessageInput"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_marginLeft="8dp"
            android:layout_marginRight="8dp"
            android:layout_marginBottom="8dp"
            android:visibility="gone"
            app:cardCornerRadius="@dimen/radius_message_input"
            app:cardElevation="6dp"
            tools:visibility="visible">

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:gravity="center"
                android:orientation="horizontal">

                <Spinner
                    android:id="@+id/number_selector"
                    android:layout_width="wrap_content"
                    android:layout_height="match_parent"
                    android:visibility="visible"
                    tools:listitem="@layout/item_number_selected"
                    tools:visibility="gone" />

                <ImageButton
                    android:id="@+id/send_data"
                    android:layout_width="wrap_content"
                    android:layout_height="match_parent"
                    android:background="?selectableItemBackgroundBorderless"
                    android:contentDescription="@string/send_file"
                    android:onClick="@{() -> presenter.selectFile()}"
                    android:padding="8dp"
                    android:tint="@android:color/darker_gray"
                    app:srcCompat="@drawable/ic_upload_black" />

                <ImageButton
                    android:id="@+id/btn_take_picture"
                    android:layout_width="wrap_content"
                    android:layout_height="match_parent"
                    android:layout_marginEnd="5dp"
                    android:background="?selectableItemBackgroundBorderless"
                    android:contentDescription="@string/take_a_photo"
                    android:onClick="@{() -> presenter.takePicture()}"
                    android:padding="8dp"
                    android:tint="@android:color/darker_gray"
                    app:srcCompat="@drawable/ic_photo_camera" />

                <cx.ring.views.MessageEditText
                    android:id="@+id/msg_input_txt"
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:background="@null"
                    android:hint="@string/write_a_message"
                    android:imeOptions="actionSend|flagNoExtractUi"
                    android:importantForAutofill="no"
                    android:inputType="textShortMessage|textImeMultiLine|text|textMultiLine|textCapSentences"
                    android:maxLines="5"
                    android:padding="8dp" />

                <ProgressBar
                    android:id="@+id/pb_data_transfer"
                    android:layout_width="30dp"
                    android:layout_height="30dp"
                    android:indeterminate="true"
                    android:visibility="gone" />

                <TextView
                    android:id="@+id/emoji_send"
                    style="?attr/borderlessButtonStyle"
                    android:layout_width="50dp"
                    android:layout_height="match_parent"
                    android:background="?selectableItemBackgroundBorderless"
                    android:onClick="@{() -> presenter.sendEmoji()}"
                    android:padding="0dp"
                    android:text="@string/conversation_default_emoji"
                    android:textSize="18sp" />

                <ImageButton
                    android:id="@+id/msg_send"
                    android:layout_width="wrap_content"
                    android:layout_height="match_parent"
                    android:background="?selectableItemBackgroundBorderless"
                    android:contentDescription="@string/send_message"
                    android:onClick="@{() -> presenter.sendMessageText()}"
                    android:padding="8dp"
                    android:tint="@android:color/darker_gray"
                    android:visibility="gone"
                    app:srcCompat="@drawable/ic_send_black" />
            </LinearLayout>
        </androidx.cardview.widget.CardView>
    </RelativeLayout>
</layout>