How can I select only one checkbox in Recyclerview and notifydataset changed

Question

In my code I have create recyclerview with check box and default one item selected already. now I want when select other item checkbox so deselect all other items mean one i

Answer 1

As you said, you are new to android first you will notice that your checkbox will have issues with recycler view.You selected some item in recycle view and after scrolling you will notice some other item is selected to solve this you need to follow this answer. or You need to create a boolean variable( to capture the state of checked checkbox for each item in recycler view)in your School Model class like this

 class SchoolModel{
    private boolean isChecked;
    public boolean isChecked(){
     return ischecked;}

    public void setIsChecked(boolean checked){
      isChecked = checked;
    }
   }

Second problem is to select only one checkbox and deselect rest of them for this you need write your logic(Check here for solution).And one major code change is to move your setOnCheckedChangeListener to view holder class because bindviewholder is called everytime you update your recyclerview and thus setting setOnCheckedChangeListener every time which is not correct.So you put this listener in view holder this will assign per checkbox listener only one time.

 checkBoxDeleteComment.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
               //your code
            }
        });

Answer 2

public class MyTeamAdapter extends RecyclerView.Adapter { private Context context; private ArrayList myTeams;

private int prevSelection = -1;


public MyTeamAdapter(Context context, ArrayList<Team> myTeams) {
    this.context = context;
    this.myTeams = myTeams;
}

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


@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, final int position) {
    final Team team = myTeams.get(position);
    ViewHolder viewHolder = (ViewHolder) holder;

    if (team.isTeamSelected()) {
        viewHolder.checkTeam.setChecked(true);
        prevSelection = position;
    } else {
        viewHolder.checkTeam.setChecked(false);
    }

    viewHolder.checkTeam.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
            if (b) {
                team.setTeamSelected(true);
                if (prevSelection >= 0) {
                    myTeams.get(prevSelection).setTeamSelected(false);
                    notifyItemChanged(prevSelection);
                }
                prevSelection = position;
            } else {
                team.setTeamSelected(false);
            }
        }
    });
}

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

public class ViewHolder extends RecyclerView.ViewHolder {
    RelativeLayout captainHolder, viceCaptainHolder;
    CheckBox checkTeam;
    TextView tvTeamName, tvCaptainName, tvCaptain, tvVCapName, tvVC, tvWcktKeeper, tvBatsMen, tvAllRounder, tvBowler;
    ImageView edtTeam, viewTeam, copyTeam;


    public ViewHolder(View itemView) {
        super(itemView);
        checkTeam = itemView.findViewById(R.id.cb_team);

        tvTeamName = itemView.findViewById(R.id.tv_team_name);

        captainHolder = itemView.findViewById(R.id.captain_holder);
        tvCaptainName = captainHolder.findViewById(R.id.tv_player_name);
        tvCaptain = captainHolder.findViewById(R.id.tv_player_type);

        viceCaptainHolder = itemView.findViewById(R.id.vc_holder);
        tvVCapName = viceCaptainHolder.findViewById(R.id.tv_player_name);
        tvVC = viceCaptainHolder.findViewById(R.id.tv_player_type);

        tvWcktKeeper = itemView.findViewById(R.id.tv_wckt_keeper);
        tvBatsMen = itemView.findViewById(R.id.tv_bats_men);
        tvAllRounder = itemView.findViewById(R.id.tv_all_rounder);
        tvBowler = itemView.findViewById(R.id.tv_baller);

        edtTeam = itemView.findViewById(R.id.edt_team);
        viewTeam = itemView.findViewById(R.id.view_team);
        copyTeam = itemView.findViewById(R.id.copy_team);

    }
}

}

Answer 3

1- You can create a variable inside Adapter class that can be used to hold the selected position:

private int selectedPosition = -1;// no selection by default

2- Inside onBindViewHolder set Check State:

holder.checkBox.setChecked(selectedPosition == position);

3- Inside setOnCheckedChangeListener you must update position

this.selectedPosition = holder.getAdapterPosition();

4- Refresh adapter

adapter.notifyDatasetChanged();

EDIT

onBindViewHolder will be called for all positions,

So method setChecked will called for all CheckBoxes, This method have a boolean input.

In above example i write setChecked(selectedPosition == position). For more readable i can write:

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

Answer 4

You can use below code; it will surely help you guys,

int selectedPosition=0;

 if (selectedPosition == position) {
            holder.itemView.setSelected(true); //using selector drawable


            GradientDrawable drawable = (GradientDrawable) holder.ll_portal.getBackground();
            drawable.setColor(getResources().getColor(R.color.darkorange));
            holder.tvPortalName.setTextColor(Color.parseColor("#FFFFFF"));


        } else {
            holder.itemView.setSelected(false);
            GradientDrawable drawable = (GradientDrawable) holder.ll_portal.getBackground();
            drawable.setColor(getResources().getColor(R.color.white));
            holder.tvPortalName.setTextColor(Color.parseColor("#000000"));
        }

        final int finalPosition = position;
        holder.ll_portal.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                totalDineInOrder= String.valueOf(gallaryModels.get(position).getDineInTotalOrder());
                totalPickupOrder= String.valueOf(gallaryModels.get(position).getPickupTotalOrder());
                selectedPosition= finalPosition;
                notifyDataSetChanged();
            }
        });

Answer 5

Try this, 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);
    }
}

}