ProgressDialogNotApperBeforalDialogInAndroidApp

在Android应用程序中，进度对话框应该出现在显示警报对话框之前。我正在使用android studio

警报对话框内容将来自单独类文件中的异步任务。因此，从异步任务执行进度对话框

但在AlertDialog打开之前，我无法看到进度对话框屏幕

下面是我的异步任务代码

  public class ResidentsPaymentInfoHttpResponse extends AsyncTask<String, 
Void, List<paymentInfo>> {
ProgressDialog pDialog;
private Context MSAContext;
public ResidentsPaymentInfoHttpResponse(Context context)   {
 MSAContext = context;
}

   @Override
    protected void onPreExecute() {
    super.onPreExecute();

    pDialog = ProgressDialog.show(MSAContext,"Autenticando", "Contactando o 
   servidor, por favor, aguarde alguns instantes.", true, false);
   }

 @Override
  protected List<UserPaymentInfo> doInBackground(String... params){
  String flatNo = params[0];
  String urls = "https://script.google.com/macros/s/;"
  List<UserPaymentInfo> residentsMonthlyPayments = new ArrayList<>();

  try {
    OkHttpClient client = new OkHttpClient();
    Request request = new Request.Builder()
            .url(urls)
            .build();

    Response responses = null;
    try
    {
        responses = client.newCall(request).execute();
        String jsonData = responses.body().string();
        JSONObject jobject = new JSONObject(jsonData);
        JSONArray jarray = jobject.getJSONArray("ResidentsInfo");

        int limit = jarray.length();

        for(int i=0;i<limit; i++)
        {
            JSONObject object = jarray.getJSONObject(i);
            if(object.getString("FlatNo").equals(flatNo) && 
      object.getString("PaymentStatus").equals("notpaid")) {
                UserPaymentInfo residentMaintePayment = new 
   UserPaymentInfo();
                UserInfo residentInfo = new UserInfo();
                residentInfo.setUserFlatNo(object.getString("FlatNo"));

                residentsMonthlyPayments.add(residentMaintePayment);
            }
        }

    }

    catch (IOException e)
    {
      //  e.printStackTrace();
    }
    pDialog.dismiss();
}
catch (Exception ex)
{
   // ex.printStackTrace();
}
return residentsMonthlyPayments;
}


protected void onPostExecute(List<UserPaymentInfo> rusult){
    super.onPostExecute(rusult);
    pDialog.dismiss();
 }
 }

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我遗漏了什么吗？

您不应该更新doInBackground中属于主/UI线程的UI元素。可能正在删除pDialog.discover；从doInBackground的结束行更改情况。

检查下面的链接。

您没有在“进度”对话框中调用“显示方法”。您应该在preExecute中执行它，然后在异步任务的postExecute方法中取消它

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同样正如VSB所说，您不应该从doInBackground方法更新UI元素。

没有Alertdialog的可能重复！