activity_channel.xml

<!-- android/app/src/main/res/layout/activity_channel.xml:1 -->
<?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="viewModel"
            type="com.getstream.sdk.chat.viewmodel.ChannelViewModel" />
    </data>

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context="com.example.chattutorial.ChannelActivity">

        <com.getstream.sdk.chat.view.ChannelHeaderView
            android:id="@+id/channelHeader"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="#FFF"
            app:layout_constraintEnd_toStartOf="@+id/messageList"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:streamChannelHeaderBackButtonShow="true" />

        <com.getstream.sdk.chat.view.MessageListView
            android:id="@+id/messageList"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_marginBottom="10dp"
            android:background="#FFF"
            app:layout_constraintBottom_toTopOf="@+id/message_input"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/channelHeader" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="16dp"
            android:padding="6dp"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

        <ProgressBar
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:isGone="@{!safeUnbox(viewModel.loading)}"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

        <ProgressBar
            android:layout_width="25dp"
            android:layout_height="25dp"
            app:isGone="@{!safeUnbox(viewModel.loadingMore)}"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="parent" />

        <com.getstream.sdk.chat.view.MessageInputView
            android:id="@+id/message_input"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="32dp"
            android:layout_marginBottom="0dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintStart_toEndOf="@+id/messageList" />
    </androidx.constraintlayout.widget.ConstraintLayout>
</layout>