activity_mainstud.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.widget.DrawerLayout xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/drawerLayout"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:fitsSystemWindows="true">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:orientation="vertical"
        android:layout_height="match_parent"
        android:background="#000000"
        tools:context=".mainstud">

        <androidx.appcompat.widget.Toolbar
            android:id="@+id/toolbar3"
            android:layout_width="410dp"
            android:layout_height="58dp"
            android:background="#48B8DD"
            android:minHeight="?attr/actionBarSize"
            android:theme="?attr/actionBarTheme"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.0" />


    </androidx.constraintlayout.widget.ConstraintLayout>
    <com.google.android.material.navigation.NavigationView
        android:id="@+id/navigation_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        app:headerLayout="@layout/header"
        app:menu="@menu/drawermenu">

    </com.google.android.material.navigation.NavigationView>

</androidx.drawerlayout.widget.DrawerLayout>