checking or unchecking a checkbox to move items from listview to the top or bottom

I have a listview that contains a checkbox next to each item. I want to move items to the top or bottom of the list by checking or unchecking them- if I check the item, move to the top and I uncheck, move to the bottom.

I have tried to implement different sets of code, including setSelection(int position). I have been focusing on the If and Else statements on the Adapter Java Class since they pertain to what happens when you check and uncheck the checkbox. When I do try to implement the setSelection(int position) method, I get error messages.

Main Activity Java Class:

public class MainActivity extends AppCompatActivity {

    ArrayList<String> selectedItems;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        selectedItems = new ArrayList<String>();
        ListView chl = (ListView) findViewById(R.id.languageselector);
        chl.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
        String[] items = {"English", "Chinese", "French", "German", "Italian", "Khmer"};
        Adapter adapter=new Adapter(this,items);
        chl.setAdapter(adapter);

        chl.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {

                int item_position=i;



            }
        });

    }

Adapter Java Class:

public class Adapter extends BaseAdapter {

    String[] items;
    LayoutInflater inflater;
   ArrayList selectedItems;
    Activity activity;
    Adapter(Activity activity, String[] items){

        this.items=items;
        inflater=activity.getLayoutInflater();
        selectedItems = new ArrayList<String>();
        this.activity=activity;
    }

    @Override
    public int getCount() {
        return items.length;
    }

    @Override
    public String getItem(int i) {
        return items[i];
    }

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

    @Override
    public View getView(final int i, View view, ViewGroup viewGroup) {

        View v = view;
        if(v == null){
            v = inflater.inflate(R.layout.checkboxlayout,null);
        }

        TextView textview_languages=(TextView)v.findViewById(R.id.Textview_languages);
        textview_languages.setText(items[i]);

        final CheckedTextView  checkedTextView=(CheckedTextView)v.findViewById(R.id.checkbox);
        checkedTextView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                if (!checkedTextView.isChecked()){
                    checkedTextView.setChecked(true);
                    selectedItems.add(items[i]);

                }
                else {
                    checkedTextView.setChecked(false);
                    selectedItems.remove(items[i]);
                }


            }
        });



        return v;
    }
}