Android Studio DrawerLayout

Question

I first have made xml file using constraint layout. After that I decided to do a menu bar(?) so I added a drawer layout, and changing it to constraint layout inside the drawer layout. When I run the coding, everything seems fine but there is one problem, I cannot click my navigation button. It is not clickable and it wont take me to the supposed class. I have done the drawerlayout on another class but without the constraint layout. Here is my coding for my xml file and also java class.

<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"
    tools:context=".MainActivity"
    android:id="@+id/drawer_layout1"
    android:fitsSystemWindows="true"
    tools:openDrawer="start"
    android:background="@drawable/background3">

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

        <androidx.appcompat.widget.Toolbar
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="@color/black"
            android:id="@+id/toolbar"
            android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
            app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
            android:elevation="4dp"/>

        <FrameLayout
            android:id="@+id/fragment_container"
            android:layout_width="match_parent"
            android:layout_height="match_parent"/>
    </LinearLayout>

    <com.google.android.material.navigation.NavigationView
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:id="@+id/nav_view"
        app:headerLayout="@layout/activity_nav_header"
        app:menu="@menu/drawer_menu1"/>

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="4dp">
        <TextView
            android:id="@+id/textView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginTop="60dp"
            android:fontFamily="@font/open_sans_bold"
            android:text="Hello Travellers!"
            android:textColor="@android:color/background_dark"
            android:textSize="24sp"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />


        <TextView
            android:id="@+id/textView2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginTop="16dp"
            android:fontFamily="@font/open_sans"
            android:lineSpacingExtra="4dp"
            android:text="Travel the world easier with CarShare"
            android:textColor="#717171"
            android:textSize="14sp"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/textView" />

        <EditText
            android:id="@+id/editText"
            android:layout_width="0dp"
            android:layout_height="50dp"
            android:layout_marginStart="16dp"
            android:layout_marginTop="24dp"
            android:layout_marginEnd="16dp"
            android:drawablePadding="12dp"
            android:ems="10"
            android:fontFamily="@font/open_sans"
            android:hint="Search"
            android:background="@drawable/search_bg"
            android:inputType="textPersonName"
            android:paddingStart="12dp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/textView2" />


        <ImageView
            android:layout_width="35dp"
            android:layout_height="35dp"
            android:src="@drawable/search"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.893"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="@+id/editText"
            app:layout_constraintVertical_bias="0.0" />

        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/discountedRecycler"
            android:layout_width="392dp"
            android:layout_height="101dp"
            android:layout_marginTop="5dp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/textView3" />

        <TextView
            android:id="@+id/textView3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginTop="24dp"
            android:fontFamily="@font/open_sans_semibold"
            android:text="Top Locations to Travel"
            android:textColor="@android:color/background_dark"
            android:textSize="16sp"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/editText" />

        <TextView
            android:id="@+id/textView4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginTop="10dp"
            android:fontFamily="@font/open_sans_semibold"
            android:text="Select Categories"
            android:textColor="@android:color/background_dark"
            android:textSize="16sp"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/discountedRecycler" />

        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/categoryRecycler"
            android:layout_width="384dp"
            android:layout_height="128dp"
            android:layout_marginTop="5dp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/textView4" />

        <TextView
            android:id="@+id/allCategoryImage"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginEnd="16dp"
            android:fontFamily="@font/open_sans_semibold"
            android:text="See More"
            android:textColor="#2D6EF1"
            app:layout_constraintBottom_toBottomOf="@+id/textView4"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toTopOf="@+id/textView4" />

        <TextView
            android:id="@+id/textView6"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginTop="10dp"
            android:fontFamily="@font/open_sans_semibold"
            android:text="Recently Viewed Items"
            android:textColor="@android:color/background_dark"
            android:textSize="16sp"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/categoryRecycler" />

        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/recently_item"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginTop="5dp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="1.0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/textView6" />



    </androidx.constraintlayout.widget.ConstraintLayout>



</androidx.drawerlayout.widget.DrawerLayout>```

>Above is my xml file

```public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
    private DrawerLayout drawerLayout;
    androidx.appcompat.widget.Toolbar toolbar;

    RecyclerView discountRecyclerView, categoryRecyclerView, recentlyViewedRecycler, carListRecycler;
    DiscountedProductAdapter discountedProductAdapter;
    List<DiscountedProducts> discountedProductsList;

    CategoryAdapter categoryAdapter;
    List<Category> categoryList;

    RecentlyViewerAdapter recentlyViewedAdapter;
    List<RecentlyViewed> recentlyViewedList;
//  CarListAdapter carListAdapter;
    //  List<CarListModel>carListModel;

    TextView allCategory;


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

        drawerLayout = findViewById(R.id.drawer_layout1);
        toolbar = findViewById(R.id.toolbar);
        NavigationView navigationView = findViewById(R.id.nav_view);
        navigationView.setNavigationItemSelectedListener(this);
        setSupportActionBar(toolbar);

        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this,drawerLayout,toolbar,R.string.navigation_drawer_open,R.string.navigation_drawer_close);
        drawerLayout.addDrawerListener(toggle);
        toggle.syncState();

        discountRecyclerView = findViewById(R.id.discountedRecycler);
        categoryRecyclerView = findViewById(R.id.categoryRecycler);
        allCategory = findViewById(R.id.allCategoryImage);
        recentlyViewedRecycler = findViewById(R.id.recently_item);



        allCategory.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
              

Answer 1

Waitting for answers