Je suis en train d'ouvrir le dialogue, mais je continue à obtenir l'erreur de compilation de `Builder (android.content.Context) Builder ne peut pas être appliquée à l'activité

Ronnie:

Le code suivant montre l' RecyclerViewactivité de classe et sous - jacente est mise en page Tab. Actuellement , le code de la route est j'obtiens une erreur où je déclare l' AlertDialogerreur dit Builder cannot be applied to the Classsi j'utiliser le contexte de l'application se bloque. Je l' ai utilisé le même code avant , mais avec Firestore Recycler Adapteret TabLayout. Cette question n'est pas une copie, null pointer java/lang/nullpointerexceptionest trop générale. Je suis passé par tous.

public class RecyclerAdapter extends FirestoreRecyclerAdapter<Items, 
RecyclerAdapter.MyViewHolder> {

Context context;


public RecyclerAdapter(@NonNull FirestoreRecyclerOptions<Items> options) 
{
    super(options);
}

@Override
protected void onBindViewHolder(@NonNull MyViewHolder holder, final int 
position, @NonNull final Items model) {
    holder.name.setText(model.getName());
    holder.category.setText(model.getCategory());
    holder.price.setText(model.getPrice());
    holder.manu.setText(model.getManufacturer());


    Picasso.get()
            .load(model.getImage())
            .fit()
            .centerCrop()
            .into(holder.Thumbnail);


    holder.addtocart.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            showAddToCartDialog(model);
        }
    });
}

@NonNull
@Override
public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int 
 viewType) {
    View view;
    LayoutInflater mInflater = LayoutInflater.from(parent.getContext());
    view = mInflater.inflate(R.layout.activity_adapter, parent, false);
    return new MyViewHolder(view);
}

class MyViewHolder extends RecyclerView.ViewHolder {
    public TextView name;
    public TextView category;
    public ImageView Thumbnail;
    public TextView price;
    public TextView manu;
    public Button addtocart;

    public MyViewHolder(View itemView) {
        super(itemView);
        name = itemView.findViewById(R.id.rowname);
        category = itemView.findViewById(R.id.categorie);
        Thumbnail = itemView.findViewById(R.id.thumbnail);
        price = itemView.findViewById(R.id.price);
        manu = itemView.findViewById(R.id.manu);
        addtocart = itemView.findViewById(R.id.cartbutton);
    }
}

public void showAddToCartDialog(final Items items) {
    View view;

    AlertDialog.Builder builder = new 
    AlertDialog.Builder(RecyclerAdapter.this);
    LayoutInflater lflator = LayoutInflater.from(context);
    view = lflator.inflate(R.layout.add_to_cart_layout, null);

    ImageView image_product_dialogue = 
    view.findViewById(R.id.image_cart_product);
    TextView textView_product_dialogue = 
    view.findViewById(R.id.text_cart_product);
    RadioButton nairobi = view.findViewById(R.id.radio_nairobi);
    RadioButton mombasa = view.findViewById(R.id.radio_mombasa);
    RadioButton kisumu = view.findViewById(R.id.radio_kisumu);
    RadioButton nakuru = view.findViewById(R.id.radio_nakuru);
    RadioButton express = view.findViewById(R.id.radio_ex);
    RadioButton tomorow = view.findViewById(R.id.radio_tomo);
    final ElegantNumberButton text_count = 
    view.findViewById(R.id.text_count);

    express.setOnCheckedChangeListener(new 
    CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean 
        isChecked) {
            if (isChecked) {
                Items.delivery = 0;
            }
          }
      });

    tomorow.setOnCheckedChangeListener(new 
    CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean 
         isChecked) {
            if (isChecked)
                Items.delivery = 1;

        }
    });

    nairobi.setOnCheckedChangeListener(new 
    CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean 
   isChecked) {
            if (isChecked)
                Items.location = 0;

        }
    });
    mombasa.setOnCheckedChangeListener(new 
    CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean 
   isChecked) {
            if (isChecked)
                Items.location = 1;

        }
    });
    kisumu.setOnCheckedChangeListener(new 
    CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean 
  isChecked) {
            if (isChecked)
                Items.location = 2;

        }
    });
    nakuru.setOnCheckedChangeListener(new 
    CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean 
   isChecked) {
            if (isChecked)
                Items.location = 3;

        }
    });

    Picasso.get()
            .load(items.getImage())
            .fit()
            .centerCrop()
            .into(image_product_dialogue);
    textView_product_dialogue.setText(items.getName());

    builder.setView(view);

    builder.setNegativeButton("ADD TO CART", new 
    DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {

            // showConfirmDialogue(position, text_count.getNumber(), 
   text_count.getNumber());
            dialog.dismiss();

        }
    });


    builder.show();

  }

 }

kelvin:

Passez contexte d'activité dans le constructeur et utiliser ce contexte pour créer de dialogue. quelque chose comme..

public RecyclerAdapter(@NonNull FirestoreRecyclerOptions<Items> options,Activity context) 
{
    super(options);
    this.context=context;
}