public class GroupsListActivity extends Activity {

    private static final int REQUEST = 1;

    String loggedUserId = Model.getInstance().getLoggedUserId();
    ListView list;
    List<Group> data;
    MyAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Set layout for this activity
        setContentView(R.layout.groups_list);

        // Show actionbar in this activity
        getActionBar().show();

        if(loggedUserId != null)
            Log.d("TAG", "My Groups for user ID: " + loggedUserId);

        // Connect between button to layout id
        list = (ListView) findViewById(R.id.my_group_list);

        // Setting adapter and creating group list
        if(loggedUserId != null) {
            Model.getInstance().getAllGroupsByUserId(loggedUserId, new Model.groupListReturnedListener() {
                @Override
                public void groupListReturned(List<Group> groupList) {
                    data = groupList;
                    adapter = new MyAdapter();
                    list.setAdapter(adapter);
                    Collections.sort(data, Group.Comparators.NAME); //Sort array
                }
            });
        }
    }


    private void onSearch() {
        Log.d("TAG", "Search button was pressed");
        Intent i = new
                Intent(getApplicationContext(),
                SearchActivity.class);

        startActivityForResult(i, REQUEST);
        overridePendingTransition(R.animator.slide_out_right, R.animator.slide_in_right);
    }



    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == REQUEST) {
            if(resultCode == RESULT_OK) {
                adapter.notifyDataSetChanged();
            }
        }
    }
}