XML : Duplicate value in NavigationView header after updating header text

After updating my header text and image in NavigationView header, I'm getting duplicate value in NavigationView header.

Here is my code part

  public class MainActivity extends AppCompatActivity      implements NavigationView.OnNavigationItemSelectedListener {    boolean doubleBackToExitPressedOnce = false;  SQLiteHelper dbHelper;  String setName, setMail;  AlertDialog.Builder builder, builder_verify;  public static int count = 0;    @Override  protected void onCreate(Bundle savedInstanceState) {      super.onCreate(savedInstanceState);      setContentView(R.layout.activity_main);      Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);      setSupportActionBar(toolbar);        dbHelper = new SQLiteHelper(getApplicationContext());      builder_verify = new AlertDialog.Builder(this);                DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);      ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(              this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);      drawer.setDrawerListener(toggle);      toggle.syncState();             NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);      navigationView.setNavigationItemSelectedListener(this);      View hView =  navigationView.inflateHeaderView(R.layout.nav_header_main);      ImageView iv = (ImageView) hView.findViewById(R.id.imageView);      TextView headerName = (TextView) hView.findViewById(R.id.txtName);      TextView headerMail = (TextView) hView.findViewById(R.id.textEmail);        iv.setImageResource(R.drawable.logo);      headerName.setText("TEST");      headerMail.setText("test@gmail.com");          }      }    

In the above code i have added view to update my header text. Also i have added main XML code below

  <?xml version="1.0" encoding="utf-8"?>  <android.support.v4.widget.DrawerLayout 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:id="@+id/drawer_layout"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:fitsSystemWindows="true"  tools:openDrawer="start">    <LinearLayout      android:layout_width="match_parent"      android:layout_height="match_parent"      android:orientation="vertical">        <include          layout="@layout/app_bar_main"          android:layout_width="match_parent"          android:layout_height="match_parent" />        <FrameLayout          android:id="@+id/flContent"          android:layout_width="match_parent"          android:layout_height="match_parent" />  </LinearLayout>    <android.support.design.widget.NavigationView      android:id="@+id/nav_view"      android:layout_width="wrap_content"      android:layout_height="match_parent"      android:layout_gravity="start"      android:fitsSystemWindows="true"      app:headerLayout="@layout/nav_header_main"      app:menu="@menu/activity_main_drawer" />  </android.support.v4.widget.DrawerLayout>    

Also added navigation header layout

nav_header_main.xml

      <?xml version="1.0" encoding="utf-8"?>  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="match_parent"  android:layout_height="@dimen/nav_header_height"  android:background="@drawable/side_nav_bar"  android:gravity="bottom"  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_width="wrap_content"      android:layout_height="wrap_content"      android:paddingTop="@dimen/nav_header_vertical_spacing"      android:src="@drawable/logo"/>    <TextView      android:id="@+id/txtName"      android:layout_width="match_parent"      android:layout_height="wrap_content"      android:paddingTop="@dimen/nav_header_vertical_spacing"      android:text="Sample"      android:textAppearance="@style/TextAppearance.AppCompat.Body2"      android:textStyle="bold" />    <TextView      android:id="@+id/textEmail"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:text="Sample Inc." /></LinearLayout>    

Also i have added the screenshot for reference

Right now, I don't see any possibilities of changing the headerview. Any suggestions to avoid duplicate header text and image?

Many thanks!