CheckBox will uncheck and check when scrolling down the listview

Question

In my application I use this to count the checked checkbox in real time meaning when tick the box the count above will increase or decrease. but when scrolling down the listview

Answer 1

In your adapter object add a boolean parameter for check and un-check. By default set false for each item in the list, when checked set as true in adapter and call notifyDataSetChanged().

Use a model class

     public class ContactModel {
        String phone,name;
        boolean sel;


        public ContactModel(String phone, String name, boolean sel) {
            this.phone = phone;
            this.name = name;
            this.sel = sel;

        }

        public String getPhone() {
            return phone;
        }

        public void setPhone(String phone) {
            this.phone = phone;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public boolean isSel() {
            return sel;
        }

        public void setSel(boolean sel) {
            this.sel = sel;
        }

My custom adapter

public class ContactADAPTER extends BaseAdapter {
    String phone,name;
    boolean sel;
 Activity act;
    List contactModels;

    public ContactADAPTER(Activity act, List contactModels) {
        this.act = act;
        this.contactModels = contactModels;
    }



    @Override
    public int getCount() {
        return contactModels.size();
    }

    @Override
    public Object getItem(int i) {
        return contactModels.get(i);
    }

    @Override
    public long getItemId(int i) {
        return i;
    }

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        LayoutInflater inflater=LayoutInflater.from(context);
        view=inflater.inflate(R.layout.phone_list_item,viewGroup,false);
        TextView phone1= (TextView) view.findViewById(R.id.phone1);
        TextView name1= (TextView) view.findViewById(R.id.name1);
        CheckBox tick= (CheckBox) view.findViewById(R.id.tick);
        phone1.setText(contactModels.get(i).getPhone());
        name1.setText(contactModels.get(i).getName());
        if(contactModels.get(i).isSel())
        {
            tick.setSelected(true);
        }
        else
        {
            tick.setSelected(true);
        }
 tick.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                contactModels.get(i).setSel(isChecked);
                notifyDataSetChanged();
//for getting ticked count

int count=0;
for(ContactModel c:contactModels)
{
if(c.isSel())
{
count++;
}
}
// show count
act.getActionBar().setTitle(String.valueOf(count));
                }
            });
            return view;
        }
    }

In Activity

 List cmodelList= new ArrayList<>();
      cmodelList.add(new ContactModel(phonenumber, name, false));
      cmodelList.add(new ContactModel(phonenumber2, name2, false));
      cmodelList.add(new ContactModel(phonenumber3, name3, false));

           ContactADAPTER contactAdapter=new ContactADAPTER(Phone_Contact_List.this,cmodelList);
            listView.setAdapter(contactList);