activity_enter_parent.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"
    android:background="@color/color_super_lightGray"
    tools:context=".EnterParentActivity">

    <EditText
        android:id="@+id/etDeptData"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginTop="32dp"
        android:layout_marginEnd="16dp"
        android:ems="10"
        android:inputType="textPersonName"
        android:text=""
        android:textColor="@color/color_Black"
        android:textSize="18sp"
        android:textStyle="bold"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/etDeptFK"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginTop="16dp"
        android:ems="10"
        android:inputType="number"
        android:text=""
        android:textColor="@color/color_Black"
        android:textSize="18sp"
        android:textStyle="bold"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/etDeptData" />

    <Button
        android:id="@+id/btnSaveDeptData"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginTop="32dp"
        android:background="@color/color_Purple"
        android:paddingLeft="29dp"
        android:paddingRight="29dp"
        android:text="Save Dept"
        android:textAllCaps="false"
        android:textColor="@color/color_White"
        android:textSize="18sp"
        android:textStyle="bold"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/etDeptFK" />

    <Button
        android:id="@+id/btnEditDept"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginTop="32dp"
        android:background="@color/color_Purple"
        android:paddingLeft="20dp"
        android:paddingRight="20dp"
        android:text="Update Dept"
        android:textAllCaps="false"
        android:textColor="@color/color_White"
        android:textSize="18sp"
        android:textStyle="bold"
        android:visibility="invisible"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/etDeptFK" />

    <Button
        android:id="@+id/btnViewDeptList"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginTop="32dp"
        android:background="@color/colorAccent"
        android:onClick="onViewDeptList"
        android:paddingLeft="12dp"
        android:paddingRight="12dp"
        android:text="View Dept List"
        android:textAllCaps="false"
        android:textColor="@color/color_White"
        android:textSize="18sp"
        android:textStyle="bold"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/btnEditDept" />

    <Button
        android:id="@+id/btnDeleteDept"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginTop="32dp"
        android:background="@color/color_lightGray"
        android:paddingLeft="24dp"
        android:paddingRight="24dp"
        android:text="Delete Dept"
        android:textAllCaps="false"
        android:textColor="@color/color_Purple"
        android:textSize="18sp"
        android:textStyle="bold"
        android:visibility="visible"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/btnViewDeptList" />

    <Button
        android:id="@+id/btnBack"
        android:onClick="onBACK"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginBottom="16dp"
        android:background="@color/color_lightGray"
        android:text="BACK"
        android:textColor="@color/color_Black"
        android:textSize="18sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

    <TextView
        android:id="@+id/tvMsg"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginBottom="32dp"
        android:paddingLeft="12dp"
        android:paddingRight="12dp"
        android:text=""
        android:textAllCaps="false"
        android:textColor="@color/color_Red"
        android:textSize="18sp"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.74"
        app:layout_constraintStart_toStartOf="parent" />

</android.support.constraint.ConstraintLayout>