OnCancelListener 在 DialogFragment 中未被调用

我有一个显示某些项目列表的简单项目，单击其中一个时，单击的项目将传递回封闭项。我还想在用户取消对话框时执行一些默认处理（使用后退按钮） - 更具体地说，在这种情况下，我想将空字符串传递给活动。AlertDialogActivity

但是，如果将对话框放在（从兼容性包中）中，则当我使用后退按钮关闭对话框时，不会调用 。我做错了什么？DialogFragmentOnCancelListener

public class SelectItemDialog extends DialogFragment {

    public interface Callback {
        void onItemSelected(String string);
    }

    private static final String ARG_ITEMS = "items";

    private Callback callback;

    public static SelectItemDialog fromItems(Collection<String> items) {
        SelectItemDialog fragment = new SelectItemDialog();
        fragment.setArguments(newArguments(items));
        return fragment;
    }

    private static Bundle newArguments(Collection<String> items) {
        Bundle arguments = new Bundle();
        arguments.putStringArray(ARG_ITEMS, items.toArray(new String[items.size()]));
        return arguments;
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        callback = (Callback) activity;
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        final String[] items = getArguments().getStringArray(ARG_ITEMS);
        return new AlertDialog.Builder(getActivity())
            .setTitle(R.string.dialog_select_email_title)
            .setItems(items, new OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    callback.onItemSelected(items[which]);
                }
            })
            .setOnCancelListener(new OnCancelListener() {
                @Override
                public void onCancel(DialogInterface dialog) {
                    // this code is not executed
                    callback.onItemSelected("");
                    throw new RuntimeException("dialog cancelled");
                }
            })
            .create();
    }
}