Inflando um ProgressView por ViewStub

layout_progress.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/layout_progress_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/md_white"
    android:gravity="center"
    android:clickable="true"
    android:focusable="true"
    app:layout_behavior="@string/scrooling_behavior"
    android:orientation="vertical">

    <ProgressBar
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="48dp"
        android:layout_marginBottom="16dp"/>

    <TextView
        android:id="@+id/progress_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Carregando..."
        android:textColor="#000000"
        android:textSize="16sp"/>

</LinearLayout>

ProgressHelper.java

import android.support.annotation.LayoutRes;
import android.view.View;

/**
 * Classe criada por Guilherme Ramos em 2018
 */
public interface ProgressHelper {

    void showProgress();

    void showProgress(String message);

    void showProgress(@LayoutRes int layoutToInflate);

    void hideProgress();

    boolean isVisible();

    View getViewInflated();

}

ProgressInflater.java

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewStub;
import android.widget.TextView;

/**
 * Classe criada por Guilherme Ramos em 2018
 */
public class ProgressInflater implements ProgressHelper {

    private boolean isVisible = false;
    private Context context;
    private final ViewGroup mViewGroup;
    private ViewStub mViewStub;
    private View mProgressView;

    /*
    caso o viewgroup seja a activity;
    public View getContentView() {
        return getWindow().getDecorView().findViewById(android.R.id.content) != null ?
                getWindow().getDecorView().findViewById(android.R.id.content) :
                findViewById(android.R.id.content).getRootView();
    }
    /*
    public ProgressInflater(final Context context, ViewGroup viewGroup) {
        this.context = context;
        mViewGroup = viewGroup;
    }

    @Override
    public void showProgress() {
        if (isVisible || context == null)
            return;

        mViewStub = new ViewStub(context);
        mViewStub.setLayoutResource(R.layout.layout_progress);
        mViewGroup.addView(mViewStub);

        mProgressView = mViewStub.inflate();

        isVisible = true;
    }

    @Override
    public void showProgress(final String message) {
        if (context == null)
            return;


        if (!isVisible) {
            mViewStub = new ViewStub(context);
            mViewStub.setLayoutResource(R.layout.layout_progress);
            mViewGroup.addView(mViewStub);
            mProgressView = mViewStub.inflate();
            System.out.println("Inflando progress view");
        }

        if (mProgressView.findViewById(R.id.progress_text) != null)
            ((TextView) mProgressView.findViewById(R.id.progress_text)).setText(message);

        isVisible = false;
    }

    @Override
    public void showProgress(final int layoutToInflate) {
        if (context == null)
            return;

        if (!isVisible) {
            mViewStub = new ViewStub(context);
            mViewStub.setLayoutResource(layoutToInflate);
            mViewGroup.addView(mViewStub);
            mProgressView = mViewStub.inflate();
        }

        isVisible = false;
    }

    @Override
    public void hideProgress() {
        if (mViewStub == null)
            return;

        mViewStub.setVisibility(View.GONE);
        isVisible = false;
    }

    @Override
    public boolean isVisible() {
        return isVisible;
    }

    @Override
    public View getViewInflated() {
        return mProgressView;
    }

}