setVisibility

 private void fillData() {
        cursor = dbHelper.fetchAllNode();
        startManagingCursor(cursor);
        String[] from = new String[] { dbAdapter.KEY_SYMMARY };
        int[] to = new int[] { R.id.label };
        SimpleCursorAdapter notes = new SimpleCursorAdapter(this,
        R.layout.todo_row, cursor, from, to);
        setListAdapter(notes);

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        this.getListView().setDividerHeight(2);
        dbHelper = new dbAdapter(this);
        dbHelper.open();
        fillData();

ListView myliList = getListView();
        if(myliList.getCount()>0){
            imgBtnDel.setVisibility(View.VISIBLE);
        }