Navigation Drawer in Android java

MainActivity.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/drawer"
    tools:context=".TabViewpager">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">


        //ADD HEAR YOUR ACTIVITY CODE

        <LinearLayout
            android:layout_width="match_parent"
            android:background="@color/black"
            android:gravity="center_vertical"
            android:padding="10dp"
            android:layout_height="?actionBarSize">

            <ImageView
                android:layout_width="30dp"
                android:layout_height="30dp"
                android:id="@+id/menu_icon"
                android:src="@drawable/ic_outline_settings_24"
                android:tint="@color/white"/>

        </LinearLayout>


        <androidx.viewpager.widget.ViewPager
            android:id="@+id/view_pager"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />
    </LinearLayout>


    <com.google.android.material.navigation.NavigationView
        android:layout_width="match_parent"
        android:layout_gravity="start"
        android:id="@+id/nav"
        app:headerLayout="@layout/item_header"
        app:menu="@menu/item_menu"
        android:layout_height="match_parent"/>



</androidx.drawerlayout.widget.DrawerLayout>


item_menu.menu

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">


    <item
        android:id="@+id/home"
        android:icon="@drawable/ic_outline_home_24"
        android:title="Home" />


    <item
        android:id="@+id/home1"
        android:icon="@drawable/ic_outline_home_24"
        android:title="Home" />


    <item
        android:id="@+id/home2"
        android:icon="@drawable/ic_outline_home_24"
        android:title="Home" />


    <item
        android:id="@+id/home3"
        android:icon="@drawable/ic_outline_home_24"
        android:title="Home" />
</menu>


Header_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:orientation="vertical"
    android:layout_height="200dp">

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scaleType="centerCrop"
        android:src="@drawable/ic_launcher_background"/>

</LinearLayout>


MainActivity.java


public class TabViewpager extends AppCompatActivity {

    private NavigationView nav;
    private DrawerLayout drawer;
    ImageView menu_icon;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_tab_viewpager);


        menu_icon=findViewById(R.id.menu_icon);
        drawer=findViewById(R.id.drawer);
        menu_icon.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                drawer.openDrawer(GravityCompat.START);
            }
        });

        nav=findViewById(R.id.nav);
        nav.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(@NonNull MenuItem item) {

                switch (item.getItemId())
                {
                    case R.id.home:
                        Toast.makeText(TabViewpager.this, "Home", Toast.LENGTH_SHORT).show();
                        break;
                }
                return false;
            }
        });
    }
}