ChatApp/app/src/main/res/layout/activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:background="#00CFCFCF">

    <include
        android:id="@+id/toolbarMain"
        layout="@layout/toolbar_layout"/>

    <View
        android:id="@+id/viewMain"
        android:layout_width="wrap_content"
        android:layout_height="100sp"
        android:layout_marginTop="10dp"
        android:background="@android:color/holo_red_light"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/toolbarMain" />

    <TextView
        android:id="@+id/titleRegistrationMain"
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="12dp"
        android:layout_marginTop="35dp"
        android:text="Username"
        android:textSize="20sp"
        app:layout_constraintStart_toEndOf="@+id/titleCircleImageViewMain"
        app:layout_constraintTop_toTopOf="@+id/viewMain" />

    <de.hdodenhof.circleimageview.CircleImageView
        android:id="@+id/titleCircleImageViewMain"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:layout_marginStart="10dp"
        android:layout_marginTop="10dp"
        app:civ_border_width="4sp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/viewMain" />

    <androidx.viewpager.widget.ViewPager
        android:id="@+id/viewPager"
        android:layout_width="match_parent"
        android:layout_height="555sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/viewMain"
        app:layout_constraintVertical_bias="1.0">

        <com.google.android.material.tabs.TabLayout
            android:id="@+id/tabLayout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@android:color/holo_red_light"
            app:tabIndicator="@android:color/holo_red_light"
            app:tabSelectedTextColor="@android:color/holo_red_light"
            app:tabTextColor="@android:color/holo_red_light" />
    </androidx.viewpager.widget.ViewPager>


</androidx.constraintlayout.widget.ConstraintLayout>