Duplication in Checkbox selection in RecyclerView

Question

Below is the my code.

holder.followDiseaseCheckBox.setOnClickListener(new View.OnClickListener() {
        @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
          


        

Answer 1

The recycler view recycles the view in OnBindViewHolder. So when items are clicked it gets reflected in some other positions. To create a global SparseBooleanArray to store the clicked position.

private final SparseBooleanArray array=new SparseBooleanArray();

Then inside final viewholder add the clickListener and onClick store the position of the clicked item.

public class ViewHolder extends RecyclerView.ViewHolder {
    public YOURVIEW view;
    public ViewHolder(View v) {
        super(v);
        view = (YOURVIEW) v.findViewById(R.id.YOURVIEWID);
        view.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                array.put(getAdapterPosition(),true);
                notifyDataSetChanged();
            }
        });
    }
}

And in inside OnBindViewHolder,

@Override
public void onBindViewHolder(final ViewHolder holder, final int position) {
    if(array.get(position)){
        holder.followDiseaseCheckBox.setChecked(true);
    }else{
        holder.followDiseaseCheckBox.setChecked(false);
    }
}