Select one checkBox in item from recyclerView and deselect previously selected checkBox

Question

I have recycler-view with sections. The item include row and title. I want to select one item with checkbox and if user select next one I want to deselect the old the one(checkbox). I cannot find anywhere to achieve this functionality.

Here is my code

recyclerView = (RecyclerView)findViewById(R.id.recyclerViewActivityExample);
    recyclerView.setLayoutManager(new LinearLayoutManager(getApplicationContext()));

    list = new ArrayList<>();
    list.add(new AnimalObject("Cat","Mammals", false));
    list.add(new AnimalObject("Lion","Mammals", false));
    list.add(new AnimalObject("Dog","Mammals", false));
    list.add(new AnimalObject("Monkey","Mammals", false));
    list.add(new AnimalObject("Puma","Mammals", false));

    list.add(new AnimalObject("Albatross","Birds", false));
    list.add(new AnimalObject("Pigeon","Birds", false));

    list.add(new AnimalObject("Crabs","Aquatic Animals", false));
    list.add(new AnimalObject("Sharks","Aquatic Animals", false));

    MyAdapter myAdapter = new MyAdapter();


    sectionedRecyclerViewAdapter = new SectionedRecyclerViewAdapter(getApplicationContext(),
            R.layout.layout_list_section, R.id.textViewItemSection, myAdapter, this);
    sectionedRecyclerViewAdapter.setSections(list);

    recyclerView.setAdapter(sectionedRecyclerViewAdapter);

}





 //-------------------Adapter----------------------------
public class MyAdapter extends RecyclerView.Adapter<MyViewHolder> implements MyViewHolder.ViewHolderClickListener {

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

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

        View itemView = LayoutInflater.
                from(parent.getContext()).
                inflate(R.layout.layout_list_item, parent, false);

        return new MyViewHolder(itemView,this);
    }

    @Override
    public void onBindViewHolder(MyViewHolder holder, final int position) {

        AnimalObject animalObject = list.get(position);

        holder.title.setText(animalObject.name);

        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // checkbox.setChecked(true);
                row_index = position;
                notifyDataSetChanged();
            }
        });

        if (row_index == position) {
            holder.checkBox.setChecked(true);
        } else {
            holder.checkBox.setChecked(false);
        }
    }

    @Override
    public void onClick(View v) {

        Toast.makeText(getApplicationContext(), list.get(sectionedRecyclerViewAdapter.getIndexForPosition(recyclerView.getChildPosition(v))).name,Toast.LENGTH_SHORT).show();

    }
}

// Adapter

 public String name;
public String type;
public boolean ischecked ;

public AnimalObject(final String name, final String type, boolean ischecked){

    this.name = name ;
    this.type = type ;
    this.ischecked = ischecked;
}
public boolean ischecked() {
    return ischecked;
}

public void setIschecked(boolean ischecked) {
    this.ischecked = ischecked;
}

It's Single item choice selection. You can manage it by declaring position = -1 and check your adapter position while clicking on it. — Piyush
– Piyush, Commented Nov 22, 2018 at 9:56
It is very likely the problem is within the adapter, can you post the code of your adapter? — Aaron
– Aaron, Commented Nov 22, 2018 at 9:59
@Piyush I am not sure how to tell which checkbox to setSelected false. — cole
– cole, Commented Nov 22, 2018 at 10:06
@code Weird.. I don't see them.. and your ViewHolder is incomplete, anyway I just want to make sure that you bind the views correctly. — Aaron
– Aaron, Commented Nov 22, 2018 at 10:09

Hossam Hassan · Accepted Answer · 2018-11-22 10:05:19Z

5

Inside your Adapter

use this :
private int row_index;

   @Override
    public void onBindViewHolder(final Main_Page_Payment_Cash_Adapter.ViewHolder holder, final int position) {

             holder.itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    // checkbox.setChecked(true);
                    row_index = position;
                    notifyDataSetChanged();
                }
            });

            if (row_index == position) {
              // checkbox.setChecked(true);
            } else {
               // checkbox.setChecked(false);
            }
    }

I hope this is what you are looking for.

answered Nov 22, 2018 at 10:05

Hossam Hassan

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3 Comments

cole Over a year ago

Thanks Hossam. But I could not see it working. I want to deselect any previous ticked checkbox.

cole Over a year ago

Managed to run your code and its working now !! Thanks and enjoy some good points.

Hossam Hassan Over a year ago

what didnt work for you to update the answer to help the others :)

Farman Ali Khan · Accepted Answer · 2018-11-22 10:30:01Z

 @Override
    public void onBindViewHolder(MyViewHolder holder, final int position) {

        AnimalObject animalObject = list.get(position);

        holder.title.setText(animalObject.name);
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                AnimalObject animalObject = list.get(position);
                int currentCheckedStatus = animalObject.ischecked();
                for (int i =0;i<list.size();i++)
                {

                    if (i==position)
                    {
                        animalObject.setIschecked(!currentCheckedStatus);
                    }
                    else
                    {
                        animalObject.setIschecked(false);
                    }
                }
                notifyDataSetChanged();
            }
        });

            holder.checkBox.setChecked(animalObject.ischecked());
    }

Mudassar Ashraf · Accepted Answer · 2022-03-02 23:15:34Z

Complete example

public class ChildAddressAdapter extends 
        RecyclerView.Adapter<ChildAddressAdapter.CartViewHolder> {

private Activity context;

private List<AddressDetail> addressDetailList;

private int selectedPosition = -1;

public ChildAddressAdapter(Activity context, List<AddressDetail> addressDetailList) {
    this.context = context;
    this.addressDetailList = addressDetailList;
}

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

    LayoutInflater inflater = LayoutInflater.from(context);
    View myView = inflater.inflate(R.layout.address_layout, parent, false);
    return new CartViewHolder(myView);
}

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

    holder.adress_checkbox.setOnClickListener(view -> {
        selectedPosition = holder.getAdapterPosition();
        notifyDataSetChanged();
    });

    if (selectedPosition==position){
        holder.adress_checkbox.setChecked(true);
    }
    else {
        holder.adress_checkbox.setChecked(false);
    }


}

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

class CartViewHolder extends RecyclerView.ViewHolder
{
    TextView address_text,address_tag;
    CheckBox adress_checkbox;

    CartViewHolder(View itemView) {
        super(itemView);
        address_text = itemView.findViewById(R.id.address_text);
        address_tag = itemView.findViewById(R.id.address_tag);
        adress_checkbox = itemView.findViewById(R.id.adress_checkbox);
    }
}}

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