Add Header Layout to NavigationView on Android

activity_main.xml

    <android.support.design.widget.NavigationView
        android:id="@+id/navigationView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="end"
        app:menu="@menu/drawer_menu"
        app:headerLayout="@layout/drawer_header">

    </android.support.design.widget.NavigationView>

drawer_header.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <Spinner
        android:id="@+id/spinnerProfile"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_alignParentRight="true"
        android:layout_gravity="center"
        android:layout_marginEnd="20dp"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="20dp"
        android:layout_marginStart="10dp"
        android:layout_marginTop="30dp"
        android:layout_marginBottom="-20dp"
        android:gravity="center" />
</RelativeLayout>

MainActivity.java

        View headerView= navigationView.getHeaderView(0);
        spinnerProfile= (Spinner) headerView.findViewById(R.id.spinnerProfile);

References
http://www.technotalkative.com/part-4-playing-with-navigationview/

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