Android RecyclerView : notifyDataSetChanged() IllegalStateException

Question

I\'m trying to update the items of a recycleview using notifyDataSetChanged().

This is my onBindViewHolder() method in the recycleview adapter.

@Over         


        

Answer 1

You can just reset the previous listener before you make changes and you won't get this exception.

private CompoundButton.OnCheckedChangeListener checkedListener = new CompoundButton.OnCheckedChangeListener() {                      
                        @Override
                        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                            //Do your stuff
                    });;

    @Override
    public void onBindViewHolder(final ViewHolder holder, final int position) {
        holder.checkbox.setOnCheckedChangeListener(null);
        holder.checkbox.setChecked(condition);
        holder.checkbox.setOnCheckedChangeListener(checkedListener);
    }

Answer 2

Using a Handler for adding items and calling notify...() from this Handler fixed the issue for me.

Answer 3

protected void postAndNotifyAdapter(final Handler handler, final RecyclerView recyclerView, final RecyclerView.Adapter adapter) {
        handler.post(new Runnable() {
            @Override
            public void run() {
                if (!recyclerView.isComputingLayout()) {
                    adapter.notifyDataSetChanged();
                } else {
                    postAndNotifyAdapter(handler, recyclerView, adapter);
                }
            }
        });
    }

Answer 4

        @Override
        public void onBindViewHolder(final MyViewHolder holder, final int position) {
            holder.textStudentName.setText(getStudentList.get(position).getName());
            holder.rbSelect.setChecked(getStudentList.get(position).isSelected());
            holder.rbSelect.setTag(position); // This line is important.
            holder.rbSelect.setOnClickListener(onStateChangedListener(holder.rbSelect, position));

        }

        @Override
        public int getItemCount() {
            return getStudentList.size();
        }
        private View.OnClickListener onStateChangedListener(final RadioButton checkBox, final int position) {
            return new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (checkBox.isChecked()) {
                        for (int i = 0; i < getStudentList.size(); i++) {

                            getStudentList.get(i).setSelected(false);

                        }
                        getStudentList.get(position).setSelected(checkBox.isChecked());

                        notifyDataSetChanged();
                    } else {

                    }

                }
            };
        }

Answer 5

your CheckBox item is in changing drawable when you call notifyDataSetChanged(); so this exception would be occurred. Try call notifyDataSetChanged(); in post of your view. For Example:

buttonView.post(new Runnable() {
                    @Override
                    public void run() {
                        notifyDataSetChanged();
                    }
                });

Answer 6

I suffered with this problem for hour and this is how you can fix it. But before you began there are some conditions to this solution.

MODEL CLASS

public class SelectUserModel {

    private String userName;
    private String UserId;
    private Boolean isSelected;


    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getUserId() {
        return UserId;
    }

    public void setUserId(String userId) {
        UserId = userId;
    }

    public Boolean getSelected() {
        return isSelected;
    }

    public void setSelected(Boolean selected) {
        isSelected = selected;
    }
}

CHECKBOX in ADAPTER CLASS

CheckBox cb;

ADAPTER CLASS CONSTRUCTOR & LIST OF MODEL

private List<SelectUserModel> userList;

public StudentListAdapter(List<SelectUserModel> userList) {
        this.userList = userList;

        for (int i = 0; i < this.userList.size(); i++) {
            this.userList.get(i).setSelected(false);
        }
    }

ONBINDVIEW [Please use onclick in place of onCheckChange]

public void onBindViewHolder(@NonNull final StudentListAdapter.ViewHolder holder, int position) {
    holder.cb.setChecked(user.getSelected());
    holder.cb.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            int pos = (int) view.getTag();
            Log.d(TAG, "onClick: " + pos);
            for (int i = 0; i < userList.size(); i++) {
                if (i == pos) {
                    userList.get(i).setSelected(true);
// an interface to listen to callbacks
                    clickListener.onStudentItemClicked(userList.get(i));
                } else {
                    userList.get(i).setSelected(false);
                }
            }
            notifyDataSetChanged();
        }
    });

}