如何在两个活动之间显示"进度"对话框？

private class MyAsyncTask extends AsyncTask<Void, Integer, String> {
    ProgressDialog progressDialog;

    @Override
    protected void onPreExecute() {
        progressDialog = new ProgressDialog(MainActivity.this);
        progressDialog.setMessage("Loading...");
        progressDialog.show();
    }

    @Override
    protected String doInBackground(Void... params) {
        // 在这里执行耗时操作
        return "Result";
    }

    @Override
    protected void onPostExecute(String result) {
        progressDialog.dismiss();
        // 更新UI
    }
}

import kotlinx.coroutines.*

private fun showProgressDialog() {
    progressDialog = ProgressDialog.show(this, "Loading", "Please wait...", true, false)
}

private fun hideProgressDialog() {
    progressDialog.dismiss()
}

private fun loadData() {
    showProgressDialog()
    GlobalScope.launch(Dispatchers.IO) {
        // 在这里执行耗时操作
        withContext(Dispatchers.Main) {
            hideProgressDialog()
            // 更新UI
        }
    }
}