notifyDataSetChanged for multiple checkboxes

Question

In attached image, SelectAll checkbox is present with in an activity, and

Answer 1

I tried it something like this,

Passed the checkAll checkbox to the Adapter class constructor and setting is Listener there itself so that we don't need to declare any flag public static from the Main Class.

Also I took couple of flags that maintain the state of the checkbox, that is I tried to maintain such that when the checkAll checkbox check is changed it does not effect the List Items checkbox and vice-versa for List Items checkbox check.

So, try this

public class myAdapter extends ArrayAdapter {

    private final List list;
    private final Activity context;
    private CheckBox checkAll;
    boolean checkAll_flag = false;
    boolean checkItem_flag = false;

    public myAdapter(Activity context, List list, CheckBox checkAll) {
        super(context, R.layout.row, list);
        this.context = context;
        this.list = list;
        this.checkAll = checkAll;
        checkAll.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton checkbox, boolean arg1) {
                if(!checkItem_flag){
                    checkAll_flag = true;
                    notifyDataSetChanged(); 
                }
            }
        });
    }

    static class ViewHolder {
        protected TextView text;
        protected CheckBox checkbox;
    }

    private boolean areAllSelected() {

         boolean areAllSelected = false;

          for (int i = 0; i < list.size(); i++) {
              if(list.get(i).isSelected()){
                  areAllSelected = true;
              }
              else{
                  areAllSelected = false;
                  return areAllSelected;
              }
          }
          return areAllSelected;
        }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        View view = null;
        if (convertView == null) {
            LayoutInflater inflator = context.getLayoutInflater();
            view = inflator.inflate(R.layout.row, null);
            final ViewHolder viewHolder = new ViewHolder();
            viewHolder.text = (TextView) view.findViewById(R.id.label);
            viewHolder.checkbox = (CheckBox) view.findViewById(R.id.check);
            viewHolder.checkbox
                    .setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

                        @Override
                        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                            Model element = (Model) viewHolder.checkbox.getTag();
                            element.setSelected(buttonView.isChecked());

                            if(!checkAll_flag){
                                checkItem_flag = true;
                                if(buttonView.isChecked()){
                                    checkAll.setChecked(areAllSelected());
                                }
                                if(!buttonView.isChecked()){
                                    checkAll.setChecked(areAllSelected());                              
                                }
                                checkItem_flag = false;
                            }
                        }
                    });
            view.setTag(viewHolder);
            viewHolder.checkbox.setTag(list.get(position));
        } else {
            view = convertView;
            ((ViewHolder) view.getTag()).checkbox.setTag(list.get(position));
        }
        ViewHolder holder = (ViewHolder) view.getTag();
        holder.text.setText(list.get(position).getName());
        holder.checkbox.setChecked(list.get(position).isSelected());    

        if(checkAll_flag){
            if(checkAll.isChecked()){
                holder.checkbox.setChecked(true);
            }
            else if(!checkAll.isChecked()){
                holder.checkbox.setChecked(false);
            }
            if(position == (list.size() -1)){
                checkAll_flag = false;
            }
        }
        return view;
    }
}