sellectionappbar.dart

  getAppBar() {
    return AppBar(
      title: Text(selectedList.length < 1
          ? "Multi Selection"
          : "${selectedList.length} item selected"),
      actions: <Widget>[
        selectedList.length < 1
            ? Container()
            : InkWell(
                onTap: () {
                  setState(() {
                    for (int i = 0; i < selectedList.length; i++) {
                      itemList.remove(selectedList[i]);
                    }
                    selectedList = List();
                  });
                },
                child: Padding(
                  padding: const EdgeInsets.all(8.0),
                  child: Icon(Icons.delete),
                ))
      ],
    );
  }
}