Multi_checkboxes_Ans

In activity called  AttendanceActivity.class,

//methos called in onCreate()
private void onClickSetAllAttendance() {
        selectAll.setOnCheckedChangeListener(new OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton buttonView,
                    boolean isChecked) {
                if (selectAll.isChecked()) {
                    InteractiveArrayAdapter.check_all_status = 1;
                    listAdapter.notifyDataSetChanged();
                } else {
                    InteractiveArrayAdapter.check_all_status = 0;
                    listAdapter.notifyDataSetChanged();
                }
            }
        });

    }


My adapter class---
-------------------------
/*
                 * Here in this adapter I am taking "SelectAll" chekbox's status as check_all_status. It will assign according to conditions
                 * In getview() i am calling a function called mCheckSelectedSize()  to check whether all checkboxes are selected or not
                 * according to returned value from mCheckSelectedSize() within onCheckedChanged() I am cheking condition and assigning the values to
                 * check_all_status and check / uncheck to SelectAll checkbox
                 */

public class InteractiveArrayAdapter extends ArrayAdapter<Model> {

    private final List<Model> listModel;
    private final Activity context;
    private TextView text;
    private CheckBox checkbox, selectAll;
    public static int check_all_status= -1;

    public InteractiveArrayAdapter(Activity context, List<Model> list, CheckBox selectAll){
        super(context, R.layout.list_items_attendance_payment, list);
        this.context = context;
        this.listModel = list;
        this.selectAll= selectAll;
    }

    @Override
    public View getView( int position, View convertView, ViewGroup parent) {
        View view = convertView;
        if (convertView == null) {
            LayoutInflater inflator = context.getLayoutInflater();
            view = inflator.inflate(R.layout.list_items_attendance_payment, null);
        }

        final Model obj = listModel.get(position);
        if(obj!=null){
            text = (TextView) view.findViewById(R.id.name);
            checkbox = (CheckBox) view.findViewById(R.id.check);

            if(text!=null){
                text.setText(listModel.get(position).getName()+" (No :"+listModel.get(position).getmNumber()+")");
            }
            if(checkbox!=null){


                checkbox.setOnCheckedChangeListener(new OnCheckedChangeListener() {

                    @Override
                    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                        obj.setSelected(isChecked);

                        boolean isAllCheckSelected = (mCheckSelectedSize()==listModel.size());
                        if((isAllCheckSelected && isChecked)||(check_all_status == 1 && isChecked)){
                            selectAll.setChecked(true);
                            check_all_status=1;
                        }
                        else if(mCheckSelectedSize()==0||check_all_status ==1){
                            selectAll.setChecked(false);
                            check_all_status=-1;
                        }

                    }

                    private int mCheckSelectedSize() {
                            int k=0;

                            for (int i = 0; i < listModel.size(); i++) {

                                if(listModel.get(i).getSelected()){
                                    k ++;
                                }
                            }
                            return k;
                        }
                });


                if (check_all_status==1 ) {
                    checkbox.setChecked(true);
                    obj.setSelected(true);
                }
                else if(check_all_status==0){
                    listModel.get(position).setSelected(false);
                    checkbox.setChecked(false);
                    obj.setSelected(false);

                }
                else
                    checkbox.setChecked(listModel.get(position).getSelected());
            }
        }
        return view;
    }
}