how to display only checked values in android

Hi in the below code I am displaying listview with checkboxes.In that list it includes friends of the users with checkbox when i want only checked data to pass the parameters as friend array.

GroupList.java

public class GroupList extends ListActivity 
{

    boolean checkBoxState[];
    private IAppManager imService = null;

    private FriendListAdapter friendAdapter;

    public String ownusername = new String();

    private class FriendListAdapter extends BaseAdapter 
    {   
        @SuppressWarnings("unused")

        class ViewHolder {
            TextView text;
            ImageView icon;
            CheckBox check1;



        }
        private LayoutInflater mInflater;
        private Bitmap mOnlineIcon;
        private Bitmap mOfflineIcon;        

        private FriendInfo[] friends = null;




        public FriendListAdapter(Context context) {
            super();            

            mInflater = LayoutInflater.from(context);

            mOnlineIcon = BitmapFactory.decodeResource(context.getResources(), R.drawable.greenstar);
            mOfflineIcon = BitmapFactory.decodeResource(context.getResources(), R.drawable.redstar);

        }

        public void setFriendList(FriendInfo[] friends)
        {
            this.friends = friends;

        }


        public int getCount() {     

            return friends.length;
        }


        public FriendInfo getItem(int position) {           

            return friends[position];
        }

        public long getItemId(int position) {

            return 0;
        }

        public View getView(final int position, View convertView, ViewGroup parent) {

            final ViewHolder holder;


            if (convertView == null) 
            {
                convertView = mInflater.inflate(R.layout.grouplist, null);


                holder = new ViewHolder();

                holder.text = (TextView) convertView.findViewById(R.id.text);
                holder.icon = (ImageView) convertView.findViewById(R.id.icon);
                holder.check1 = (CheckBox) convertView.findViewById(R.id.checkBox1);

                convertView.setTag(holder);

            }           

            else {

                holder = (ViewHolder) convertView.getTag();
            }


            holder.text.setText(friends[position].userName);
            holder.icon.setImageBitmap(friends[position].status == STATUS.ONLINE ? mOnlineIcon : mOfflineIcon);
            checkBoxState = new boolean[friends.length];
            holder.check1.setChecked(checkBoxState[position]);
            holder.check1.setOnCheckedChangeListener(new OnCheckedChangeListener(){

                public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                    checkBoxState[position]=isChecked;



                    Toast.makeText(getApplicationContext(),friends[position].userName+"checked", Toast.LENGTH_LONG).show();
                }
            });


            return convertView;
        }
        protected void onCreate(Bundle savedInstanceState) 
    {       
        super.onCreate(savedInstanceState);
        if (android.os.Build.VERSION.SDK_INT > 9) {
            StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
            .permitAll().build();
            StrictMode.setThreadPolicy(policy);
        }
        setContentView(R.layout.group_list_screen);
        friendAdapter = new FriendListAdapter(this);
        Button create=(Button)findViewById(R.id.create);
        create.setOnClickListener(new OnClickListener() {

            @SuppressWarnings("unused")
            @Override
            public void onClick(View v) {
                String groupname = getIntent().getStringExtra("nick");


                        try {

                            FriendInfo[] friend=FriendController.getFriendsInfo();

                            System.out.print(friend.length);


                            String result1 = imService.CreateGroup(groupname,imService.getUsername(),friend);
                        } catch (UnsupportedEncodingException e) {

                            e.printStackTrace();
                        }


                Toast.makeText(getApplicationContext(), "Group Created Sucessfully",Toast.LENGTH_LONG).show();

            }
        });