activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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">

    <TextView
        android:id="@+id/txt_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginTop="120dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:text="Student Login"
        android:textAlignment="center"
        android:textColor="#101"
        android:textSize="34dp"
        android:textStyle="bold"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.497"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <ImageView
        android:id="@+id/Img_logo"
        android:layout_width="104dp"
        android:layout_height="104dp"
        android:layout_marginStart="25dp"
        android:layout_marginLeft="25dp"
        android:layout_marginTop="25dp"
        android:src="@drawable/cov_logo"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/txt_username"
        android:layout_width="151dp"
        android:layout_height="35dp"
        android:layout_marginStart="50dp"
        android:layout_marginLeft="50dp"
        android:layout_marginTop="48dp"
        android:text="Username"
        android:textColor="#3F51B5"
        android:textSize="25sp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/txt_title" />

    <TextView
        android:id="@+id/txt_confirm_password"
        android:layout_width="151dp"
        android:layout_height="32dp"
        android:layout_marginStart="50dp"
        android:layout_marginLeft="50dp"
        android:layout_marginTop="8dp"
        android:text="Password"
        android:textColor="#3F51B5"
        android:textSize="25sp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/edit_email" />

    <EditText
        android:id="@+id/edit_email"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="50dp"
        android:layout_marginLeft="50dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="50dp"
        android:layout_marginRight="50dp"
        android:autoLink="email"
        android:autofillHints=""
        android:clickable="true"
        android:cursorVisible="true"
        android:ems="10"
        android:focusable="true"
        android:hint="Email"
        android:inputType="textEmailAddress"
        android:linksClickable="true"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/txt_username" />

    <EditText
        android:id="@+id/edit_password"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="50dp"
        android:layout_marginLeft="50dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="50dp"
        android:layout_marginRight="50dp"
        android:autofillHints=""
        android:ems="10"
        android:hint="Password"
        android:inputType="textPassword"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/txt_confirm_password" />

    <Button
        android:id="@+id/btn_register"
        android:layout_width="249dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="50dp"
        android:layout_marginLeft="50dp"
        android:layout_marginEnd="50dp"
        android:layout_marginRight="50dp"
        android:layout_marginBottom="50dp"
        android:background="#FFFFFF"
        android:clickable="true"
        android:ems="10"
        android:linksClickable="true"
        android:onClick="btn_register_Clicked"
        android:text="New? Register Here"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

    <Button
        android:id="@+id/btn_login"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="70dp"
        android:layout_marginLeft="70dp"
        android:layout_marginTop="25dp"
        android:onClick="btn_login_Clicked"
        android:text="Login"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/edit_password" />

</android.support.constraint.ConstraintLayout>