app/src/main/res/layout/layout_nav_header.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:background="@color/colorPrimary"
    android:gravity="bottom"
    android:layout_height="@dimen/nav_header_height"
    android:layout_width="match_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:theme="@style/ThemeOverlay.AppCompat.Dark">

    <ImageView
        android:id="@+id/imageView"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:paddingTop="@dimen/nav_header_vertical_spacing"
        app:srcCompat="@android:drawable/sym_def_app_icon"/>

    <TextView
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        android:paddingTop="@dimen/nav_header_vertical_spacing"
        android:text="Rajan Maurya"
        android:textColor="@color/white"
        android:textAppearance="@style/TextAppearance.AppCompat.Body1"
        android:textStyle="bold"
        android:typeface="monospace"/>

    <TextView
        android:id="@+id/textView"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:textColor="@color/white"
        android:text="rajanmaurya154@gmail.com"/>

</LinearLayout>