Estoy usando un hilo separado para obtener el objeto json de la url. pero el problema es que me gustaría mostrar el diálogo de progreso mientras obtengo el resultado. He creado un cuadro de diálogo de progreso y he llamado a mostrar y cerrar antes y después de la ejecución de subprocesos. pero el diálogo de progreso no se muestra. Esta es la forma en que he llamado mi hilo.

    private void getRecordsByCount(final String data) {
        try {
            // btnSelectall.setText(" ");
            int color=Color.BLACK;
            showProgressDialog();
            tableLayoutGrid.removeAllViews();
            final String[] details = data.split("_");
            SimpleDateFormat df = new SimpleDateFormat("MM/dd/yyyy");
            String formattedDate = df.format(new Date());
            String url = ipaddress + "/GrantLeavesList?Companyid=" + user_info.get("CompanyId") + "&divisionid=" + details[3] + "&userid=" + user_info.get("userid") + "&roleid="
                    + user_info.get("RoleId") + "&Employeeid=" + user_info.get("EmployeeId") + "&leavetypeid=" + staticDetails.get(details[0]) + "&strStatus=" + staticDetails.get(details[1])
                    + "&type=" + staticDetails.get(details[2]) + "&Date=" + formattedDate;
            JsonThread thread = new JsonThread(url);
            thread.start();
            // thread.setPriority(Thread.MAX_PRIORITY);
            thread.join();
            JSONObject obj = thread.returnResult();
            btnGrantSubmit.setVisibility(View.GONE);
            if (obj != null) {

                leaveforwardcounts = obj.getJSONArray("Table1");

                ScrollView scrollGrid = new ScrollView(this);
                TableRow datarow = new TableRow(this);
                datarow.setWeightSum(100);
                TableLayout table = new TableLayout(this);
                for (int i = 0; i < leaveforwardcounts.length(); i++) {
                    btnGrantSubmit.setVisibility(View.VISIBLE);
                    JSONObject record = leaveforwardcounts.getJSONObject(i);
                    String applicantname = record.getString("Applicant");
                    String toDate = record.getString("ToDate");
                    String noofdays = record.getString("NumberOfDays");
                    String LOP = record.getString("LOP");
                    if(LOP!=null && LOP.trim().length()!=0)
                    {
                        color=Color.RED;
                    }
                    final int id = i;
                    final Button gridbutton = new Button(this);
                    gridbutton.setText(status);
                    gridbutton.setTextColor(Color.BLACK);
                    gridbutton.setBackgroundResource(R.drawable.grdbutton_30x30);
                    gridbutton.setGravity(Gravity.CENTER);
                    gridbutton.setPadding(2, 0, 2, 0);
                    gridbutton.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View v) {
                            changeRadioButtonState(gridbutton, id, data);
                        }
                    });
                    gridbutton.setOnLongClickListener(new OnLongClickListener() {

                        @Override
                        public boolean onLongClick(View v) {
                            setSelection(gridbutton);
                            return true;
                        }
                    });

                    TextView tvApplicantName = new TextView(this);

                    TextView tvToDate = new TextView(this);
                    TextView tvNoOfDays = new TextView(this);
                    TextView empty = new TextView(this);
                    TextView empty2 = new TextView(this);
                    if (applicantname.trim().length() >= 18) {
                        applicantname = applicantname.substring(0, 18);
                    }

                    tvApplicantName.setText(applicantname);
                    tvApplicantName.setTypeface(font2);
                    tvApplicantName.setWidth(70);
                    tvApplicantName.setTextColor(color);
                    tvApplicantName.setPadding(5, 0, 0, 0);

                    tvToDate.setText(toDate);
                    tvToDate.setTypeface(font2);
                    tvNoOfDays.setText(noofdays);
                    tvNoOfDays.setTypeface(font2);
                    tvNoOfDays.setGravity(Gravity.RIGHT);

                    Button ivDetails = new Button(this);
                    ivDetails.setText(" ");
                    ivDetails.setPadding(2, 0, 2, 0);
                    ivDetails.setBackgroundResource(R.drawable.detailsbutton_30x30);
                    ivDetails.setGravity(Gravity.CENTER);

                    ivDetails.setOnClickListener(new View.OnClickListener() {

                        @Override
                        public void onClick(View v) {
                            leaveDetails = new PopupWindow(showLeaveDetails(id, leaveforwardcounts,data), (int) (width * 0.8), height / 2, true);
                            leaveDetails.showAtLocation(mainlayout, Gravity.CENTER, 0, 0);
                        }
                    });

                    TableRow row = new TableRow(this);

                    row.setPadding(0, 3, 0, 3);
                    row.setWeightSum(100);
                    row.addView(tvApplicantName, new TableRow.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT, 55));
                    row.addView(tvNoOfDays, new TableRow.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT, 5));
                    row.addView(empty2, new TableRow.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, 20));
                    row.addView(ivDetails, new TableRow.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, 5));
                    row.addView(empty, new TableRow.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, 5));
                    row.addView(gridbutton, new TableRow.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, 5));
                    table.addView(row);
                }
                scrollGrid.addView(table);
                datarow.addView(scrollGrid, new TableRow.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT, 100));
                tableLayoutGrid.addView(datarow);
                dialog.dismiss();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }



package com.MobJax.dashboard;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;

import org.apache.http.util.ByteArrayBuffer;
import org.json.JSONObject;


public class JsonThread extends Thread{
    boolean running=false;
    String url;
    JSONObject jobj=null;

    public JsonThread(String url)
    {
        this.url=url;
    }
    @Override
    public void run() {
        int k=0;

        URL url1;
        try {

            url1 = new URL(url);
            InputStream input=url1.openStream();
            BufferedInputStream bis=new BufferedInputStream(input);
            ByteArrayBuffer baf=new ByteArrayBuffer(1000);
            while((k=bis.read())!=-1)
            {
            baf.append((byte)k);

            }
            String results=new String(baf.toByteArray());
              jobj=new JSONObject(results);
            } 
        catch (MalformedURLException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        } 
        catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }

    }
    public JSONObject returnResult()
    {
        return jobj;
    }

}