When I click on the { Buy Now button } for every item in my app,( picture below) a fragment opens instead of an activity How can I do this?

General
1

I want a fragment to open when I click on the { Buy Now button } of each item in my app This is my item Button but I can’t. When I write a Button onclick listener in my adapter’s onBindViewholder,

And when I call the fragment transaction in onBindViewHolder, I can’t get it.

Below is my adapter class :

public static class DataAdapter extends RecyclerView.Adapter<DataAdapter.DataViewHolder>{

    Context context;
    ArrayList<DataViewModel>modelArrayList;

    public DataAdapter(Context context, ArrayList<DataViewModel> modelArrayList) {
        this.context = context;
        this.modelArrayList = modelArrayList;
    }






    @NonNull
    @Override
    public DataViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

        return new DataViewHolder(LayoutInflater.from(context).inflate(R.layout.view_item,parent,false));
    }





    @Override
    public void onBindViewHolder(@NonNull DataViewHolder holder, int position) {

        DataViewModel model =modelArrayList.get(position);

     holder.tvTittle.setText(model.getTittle());
     holder.tvPrice.setText(model.getPrice());
     Glide.with(context).load(model.getProfile()).into(holder.tvImage);


    holder.btnBuy.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {





     }
     });


    }




    @Override
    public int getItemCount() {
        return modelArrayList.size();
    }






    //...........View Holder...........
    public  static class DataViewHolder extends RecyclerView.ViewHolder{
        TextView tvTittle,tvPrice;
        ImageView tvImage;
        AppCompatButton btnBuy;

        public DataViewHolder(@NonNull View itemView) {
            super(itemView);
            tvTittle=itemView.findViewById(R.id.tvTittle);
            tvPrice=itemView.findViewById(R.id.tvPrice);
            tvImage=itemView.findViewById(R.id.tvImage);
            btnBuy=itemView.findViewById(R.id.btnBuy);


        }

    }


}

Note :- My main point is that I want to open a fragment instead of an activity when the { btnBuy } is clicked.

I solved this using Activity and Intent , but I want the fragment to open here, click on the { Buy Now button } [This is the button of each item

How can I solve this?

2

You’re on the right track, but the main problem here is fragment transactions require a FragmentManager, and you don’t have direct access to a FragmentManager from within a RecyclerView Adapter.

You cannot safely do a fragment transaction from inside onBindViewHolder() directly. Instead, you should pass a callback or interface from the Activity/Fragment that owns the RecyclerView to the adapter, and let that activity/fragment handle the actual navigation.

Solution: Use a Click Listener Interface

Step 1: Create an interface

public interface OnBuyNowClickListener {
    void onBuyNowClicked(DataViewModel model);
}

Step 2: Modify your DataAdapter to accept the listener

public static class DataAdapter extends RecyclerView.Adapter<DataAdapter.DataViewHolder> {

    Context context;
    ArrayList<DataViewModel> modelArrayList;
    OnBuyNowClickListener listener;

    public DataAdapter(Context context, ArrayList<DataViewModel> modelArrayList, OnBuyNowClickListener listener) {
        this.context = context;
        this.modelArrayList = modelArrayList;
        this.listener = listener;
    }

    @NonNull
    @Override
    public DataViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        return new DataViewHolder(LayoutInflater.from(context).inflate(R.layout.view_item, parent, false));
    }

    @Override
    public void onBindViewHolder(@NonNull DataViewHolder holder, int position) {
        DataViewModel model = modelArrayList.get(position);

        holder.tvTittle.setText(model.getTittle());
        holder.tvPrice.setText(model.getPrice());
        Glide.with(context).load(model.getProfile()).into(holder.tvImage);

        holder.btnBuy.setOnClickListener(v -> {
            if (listener != null) {
                listener.onBuyNowClicked(model);
            }
        });
    }

    @Override
    public int getItemCount() {
        return modelArrayList.size();
    }

    public static class DataViewHolder extends RecyclerView.ViewHolder {
        TextView tvTittle, tvPrice;
        ImageView tvImage;
        AppCompatButton btnBuy;

        public DataViewHolder(@NonNull View itemView) {
            super(itemView);
            tvTittle = itemView.findViewById(R.id.tvTittle);
            tvPrice = itemView.findViewById(R.id.tvPrice);
            tvImage = itemView.findViewById(R.id.tvImage);
            btnBuy = itemView.findViewById(R.id.btnBuy);
        }
    }
}

Step 3: Use the adapter in your Fragment or Activity

Here’s how you set it up in your Fragment or Activity that hosts the RecyclerView:

dataAdapter = new DataAdapter(getContext(), dataList, new OnBuyNowClickListener() {
    @Override
    public void onBuyNowClicked(DataViewModel model) {
        // Pass data via bundle if needed
        BuyNowFragment fragment = new BuyNowFragment();
        Bundle args = new Bundle();
        args.putString("title", model.getTittle());
        args.putString("price", model.getPrice());
        fragment.setArguments(args);

        // Perform fragment transaction
        FragmentTransaction transaction = getActivity().getSupportFragmentManager().beginTransaction();
        transaction.replace(R.id.fragment_container, fragment); // use your container id
        transaction.addToBackStack(null);
        transaction.commit();
    }
});

Step 4: Create your BuyNowFragment

public class BuyNowFragment extends Fragment {
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater,
                             @Nullable ViewGroup container,
                             @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_buy_now, container, false);

        String title = getArguments().getString("title");
        String price = getArguments().getString("price");

        // Do something with title and price

        return view;
    }
}

Summary

  • Use an interface to delegate the button click event from the adapter to the hosting component.
  • Let your Activity or Fragment handle the actual FragmentTransaction.
  • You cannot and should not perform FragmentTransaction inside the Adapter directly.

Let me know if you need help wiring up the XML or handling the data passed to BuyNowFragment.