Agfdhyk

views bellow recyclerview are giving null value thus unable to set visibility of that views i tried to find view by every method but it is always giving null pointers exception
its giving me this "Attempt to invoke virtual method 'void android.widget.TextView.setVisibility(int)' on a null object reference"

 <?xml version="1.0" encoding="utf-8"?>

<android.support.constraint.ConstraintLayout 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"

    app:layout_behavior="@string/appbar_scrolling_view_behavior"

    tools:context=".Activity.MenuListActivity"

    tools:showIn="@layout/app_bar_menu_lis"

    android:background="@drawable/contentbg">



    <android.support.v7.widget.RecyclerView

        android:id="@+id/recycleView"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_alignTop="@+id/hiddenCart"

        android:layout_alignParentStart="true"

        android:layout_alignParentTop="true"

        android:layout_marginStart="0dp"

        android:layout_marginTop="0dp"

        android:layout_marginBottom="-4dp">



    </android.support.v7.widget.RecyclerView>



    <android.support.constraint.ConstraintLayout

        android:id="@+id/hiddenCart"

        android:layout_width="match_parent"

        android:layout_height="100dp"

        android:layout_alignParentStart="true"

        android:layout_alignParentBottom="true"

        android:layout_marginBottom="5dp"

        app:layout_constraintBottom_toBottomOf="parent"

        app:layout_constraintEnd_toEndOf="parent"

        app:layout_constraintStart_toStartOf="parent">



       <TextView

            android:id="@+id/totalTV"

            android:layout_width="100dp"

            android:layout_height="25dp"

            android:layout_marginStart="12dp"

            android:layout_marginTop="59dp"

            android:text="sub"

            android:textColor="@color/common_google_signin_btn_text_dark_focused"

            app:layout_constraintStart_toStartOf="parent"

            app:layout_constraintTop_toTopOf="parent" />



        <TextView

            android:id="@+id/disTotal"

            android:layout_width="100dp"

            android:layout_height="30dp"

            android:layout_marginStart="13dp"

            android:layout_marginTop="20dp"

            android:fontFamily="@font/playfair_display"

            android:text="Total"

            android:textColor="@color/common_google_signin_btn_text_dark_focused"

            android:textSize="18sp"

            app:layout_constraintStart_toStartOf="parent"

            app:layout_constraintTop_toTopOf="parent" />



        <ImageView

            android:id="@+id/cartIconIV"

            android:layout_width="100dp"

            android:layout_height="50dp"

            android:layout_marginEnd="15dp"

            android:layout_marginBottom="25dp"

            app:layout_constraintBottom_toBottomOf="parent"

            app:layout_constraintEnd_toEndOf="parent"

            app:srcCompat="@mipmap/ic_launcher" />



    </android.support.constraint.ConstraintLayout>

</android.support.constraint.ConstraintLayout>

This my activity

enter code hepublic class MenuListActivity extends AppCompatActivity {

private RecyclerView recyclerView;

private List<MenuIT> productList;

private MenuItemAdapter adapter;

private FirebaseFirestore db;

public TextView tv;

@Override

protected void onCreate(@Nullable Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_menu_list);

    recyclerView=(RecyclerView)findViewById(R.id.recycleView);

    db=FirebaseFirestore.getInstance();



    recyclerView.setHasFixedSize(true);

    productList=new ArrayList<>();

    recyclerView.setLayoutManager(new LinearLayoutManager(this));

    adapter=new MenuItemAdapter(this,productList);

    recyclerView.setAdapter(adapter);





    tv=(TextView) findViewById(R.id.disTotal);







    db.collection("menu").get().addOnSuccessListener(new OnSuccessListener<QuerySnapshot>() {

        @Override

        public void onSuccess(QuerySnapshot queryDocumentSnapshots) {



            try{

                if(!queryDocumentSnapshots.isEmpty()){

                    List<DocumentSnapshot> list=queryDocumentSnapshots.getDocuments();



                    for(DocumentSnapshot d:list){

                        MenuIT menuItem=d.toObject(MenuIT.class);

                        productList.add(menuItem);

                    }

                    adapter.notifyDataSetChanged();

                }}

            catch (Exception e){

                Toast.makeText(MenuListActivity.this, ""+e.toString(), Toast.LENGTH_SHORT).show();

            }

        }



    });













}









public void getCount(int count)

{

    if(count>0)

    {



        tv.setVisibility(View.GONE);

    }

}

}
This my adapter for recyclerview

public class MenuItemAdapter extends RecyclerView.Adapter<MenuItemAdapter.ViewHolder> {

private Context mContext;

private FirebaseFirestore db;

private List<MenuIT> productList;

private HashMap itemRecord;





public MenuItemAdapter(Context mContext, List<MenuIT> productList) {

    this.mContext = mContext;

    this.productList = productList;



}









@NonNull

@Override

public ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int viewType) {



    LayoutInflater inflater= LayoutInflater.from(mContext);

    View view=inflater.inflate(R.layout.menu_recycler_view,null);

    ViewHolder holder=new ViewHolder(view);

    return holder;

}



@Override

public void onBindViewHolder(@NonNull final ViewHolder viewHolder, final int position) {

    final MenuIT menuItem=productList.get(position);

    final ItemMap itemMap=new ItemMap();

    final MenuListActivity menuL=new MenuListActivity();



    itemRecord=itemMap.getItemRecord();

    viewHolder.menuDescTV.setText(menuItem.getItemName());

    db=FirebaseFirestore.getInstance();

    viewHolder.itemprice.setText(String.valueOf(menuItem.getItemPrice()));

    viewHolder.plusTv.setOnClickListener(new View.OnClickListener() {

        @Override

        public void onClick(View v) {

            int id=menuItem.getId();

            Toast.makeText(mContext, ""+id, Toast.LENGTH_SHORT).show();

            int count=Integer.parseInt(viewHolder.menuItemCount.getText().toString());

            if(count<10 ) {

                count++;

                itemRecord.put(menuItem.getItemName(),count);

               itemMap.setItemRecord(itemRecord);

                Toast.makeText(mContext, ""+itemRecord.get(menuItem.getItemName()), Toast.LENGTH_SHORT).show();

                viewHolder.menuItemCount.setText("" + count);



                }

                if (count>0)

                {

                    menuL.getCount(count);

                 }



        }

    });

    viewHolder.minusTV.setOnClickListener(new View.OnClickListener() {

        @Override

        public void onClick(View v) {





                int count=Integer.parseInt(viewHolder.menuItemCount.getText().toString());

                if(count>0) {

                    count--;

                    itemRecord.put(menuItem.getItemName(),count);

                    Toast.makeText(mContext, ""+itemRecord.get(menuItem.getItemName()), Toast.LENGTH_SHORT).show();

                    viewHolder.menuItemCount.setText("" + count);





                }









        }

    });

}



@Override

public int getItemCount() {

    return productList.size();

}



public class ViewHolder extends RecyclerView.ViewHolder {

   private ImageView menuIV;

   private TextView menuDescTV;

   private ImageView plusTv;

   private ImageView minusTV;

   private TextView menuItemCount;

   private TextView itemprice;









    public ViewHolder(@NonNull View itemView) {

        super(itemView);

        menuIV=itemView.findViewById(R.id.menuIV);

        menuDescTV=itemView.findViewById(R.id.menuDescTV);

        plusTv=itemView.findViewById(R.id.plusTV);

        minusTV=itemView.findViewById(R.id.minusTV);

        db=FirebaseFirestore.getInstance();

        menuItemCount=itemView.findViewById(R.id.menuItemCount);

        itemprice=itemView.findViewById(R.id.itemPrice);



















    }



}

}