I want to show a DialogFragment with no title, buttons, etc.(i.e, none of what is included in a typical Dialog) but just a ProgressBar spinner on a plain background. For a rough idea, the background's width matches that of the parent and spinner lies at the center of it. For this, I have a custom layout as follows:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent" android:layout_height="match_parent">
    <View
        android:id="@+id/search_progress_alpha_indicator"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginBottom="8dp"
        android:layout_marginLeft="16dp"
        android:layout_marginStart="16dp"
        android:layout_marginRight="16dp"
        android:layout_marginEnd="16dp"
        android:layout_marginTop="8dp"
        app:layout_constraintBottom_toTopOf="@+id/guideline3"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="@+id/guideline2"
        android:background="#00ffffff"/>
    <ProgressBar
        android:id="@+id/search_tutors_progress_bar"
        style="?android:attr/progressBarStyle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        android:visibility="gone"/>
    <android.support.constraint.Guideline
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/guideline2"
        app:layout_constraintGuide_percent="0.20"
        android:orientation="horizontal"
        tools:layout_editor_absoluteY="126dp"
        tools:layout_editor_absoluteX="0dp" />
    <android.support.constraint.Guideline
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/guideline3"
        app:layout_constraintGuide_percent="0.80"
        android:orientation="horizontal"
        tools:layout_editor_absoluteY="378dp"
        tools:layout_editor_absoluteX="0dp" />
</android.support.constraint.ConstraintLayout>
Here, View is the background on top of which the ProgressBar is supposed to spin.
But when I inflate this layout in the DialogFragment, it shows something completely different:
Here is the DialogFragment code:
public static class SearchIndicatorDialogFragment extends DialogFragment{
        public static String FRAGMENT_TAG = "searchIndDiaFragTag";
        private View alphaSearchIndicator;
        private ProgressBar progressBar;
        @Override
        public void onCreate(@Nullable Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
        }
        @Nullable
        @Override
        public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
            View dialogRootView = inflater.inflate(R.layout.fragment_search_dialog, container, false);
            // Obtain the ProgressBar
            progressBar = (ProgressBar) dialogRootView.findViewById(R.id.search_tutors_progress_bar);
            // Obtain the Alpha search indicator
            alphaSearchIndicator = dialogRootView.findViewById(R.id.search_progress_alpha_indicator);
            return dialogRootView;
        }
        @Override
        public void onStop() {
            progressBar.setVisibility(View.GONE);
            alphaSearchIndicator.setBackgroundColor(0x00ffffff);
            super.onStop();
        }
        @Override
        public void onResume() {
            progressBar.setVisibility(View.VISIBLE);
            alphaSearchIndicator.setBackgroundColor(0xA6ffffff);
            super.onResume();
        }
    }
Why is it not showing my custom layout as intended?
EDIT: As an additional note, The problem in my case is that the background View is supposed to be occupying 60% area of screen(height wise) and for this I have constrained it in between the Guidelines. This is something, I am unable to achieve with other answers to similar questions regarding DialogFragment. Moreover, I would like to know, why does a DialogFragment doesn't display the correct by default in general?

 
     
     
     
     
     
    