在片段中未取消进度对话框

public class MyFragment extends Fragment {
    private ProgressDialog progressDialog;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_layout, container, false);
        // 在布局文件中添加一个进度对话框组件

        // ...

        return view;
    }

    private void showProgressDialog() {
        progressDialog = new ProgressDialog(getActivity());
        progressDialog.setTitle("正在加载");
        progressDialog.setMessage("请稍候...");
        progressDialog.setCancelable(true);
        progressDialog.show();
    }

    private void updateProgress(int progress) {
        progressDialog.setProgress(progress);
    }

    private void dismissProgressDialog() {
        progressDialog.dismiss();
    }

    private void performTask() {
        showProgressDialog();

        // 执行操作，根据需要更新进度对话框的进度

        dismissProgressDialog();
    }
}