问如何在自定义对话框上显示进度对话框？

EN

private void progressDialog() {
    kProgressHUD = new KProgressHUD(getActivity());
    if (!kProgressHUD.isShowing()) {
        kProgressHUD.setStyle(KProgressHUD.Style.SPIN_INDETERMINATE)
                .setLabel("Please wait")
                .setCancellable(false)
                .setAnimationSpeed(2)
                .setDimAmount(0.5f)
                .show();
    }
}

final Dialog dialog = new Dialog(consumerHomeActivity);
    dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
    dialog.setContentView(R.layout.custom_dialog_select_vendor);
    dialog.setCancelable(true);
    dialog.setCanceledOnTouchOutside(false);
    Window window = dialog.getWindow();
    window.setLayout(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
    WindowManager.LayoutParams wlp = window.getAttributes();
    wlp.gravity = Gravity.CENTER;
    window.setAttributes(wlp);

    loadVendorsListFromFirebaseDB(dialog, bookingType);
    dialog.show();

private void loadVendorsListFromFirebaseDB(final Dialog dialog, final String bookingType) {

    progressDialog();

    final ArrayList<VendorsList> arrayListVendorsList = new ArrayList<>();
    final ListView vendorsListLv = dialog.findViewById(R.id.custom_dialog_select_vendor_list_lv);

    DatabaseReference databaseReferenceVendorsList = firebaseDatabase.getReference("vendorsList");

    databaseReferenceVendorsList.addListenerForSingleValueEvent(new com.google.firebase.database.ValueEventListener() {
        @Override
        public void onDataChange(final com.google.firebase.database.DataSnapshot dataSnapshot) {
            arrayListVendorsList.clear();

            for (DataSnapshot postSnapshot : dataSnapshot.getChildren()) {

                String vendorEmailId = postSnapshot.getKey();
                String vendorName = postSnapshot.child("vendorName").getValue(String.class);

                VendorsList vendorsList = new VendorsList();
                vendorsList.setVendorEmailID(vendorEmailId);
                vendorsList.setVendorName(vendorName);

                arrayListVendorsList.add(vendorsList);

            }

            if (arrayListVendorsList.size() == 0) {
                StaticMethods.customSnackBar(consumerHomeActivity.parentLayout, "Sorry, no vendors available right now",
                        getResources().getColor(R.color.colorPrimaryDark),
                        getResources().getColor(R.color.error_orange), 3000);
            }

            vendorsListAdapter = new VendorsListAdapter(consumerHomeActivity, arrayListVendorsList);
            vendorsListLv.setAdapter(vendorsListAdapter);

            dismissDialog();
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });

}