ProgressDialog is deprecated.What is the alternate one to use?

Yes, in API level 26 it's deprecated. Instead, you can use progressBar.

To create it programmatically:

First get a reference to the root layout

RelativeLayout layout = findViewById(R.id.display);  //specify here Root layout Id

or

RelativeLayout layout = findViewById(this);

Then add the progress bar

progressBar = new ProgressBar(youractivity.this, null, android.R.attr.progressBarStyleLarge);RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(100, 100);params.addRule(RelativeLayout.CENTER_IN_PARENT);layout.addView(progressBar, params);

To show the progress bar

progressBar.setVisibility(View.VISIBLE);

To hide the progress bar

progressBar.setVisibility(View.GONE);

To disable the user interaction you just need to add the following code

getWindow().setFlags(WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE,                           WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE);

To get user interaction back you just need to add the following code

getWindow().clearFlags(WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE);

Just for future reference, change the android.R.attr.progressBarStyleSmall to android.R.attr.progressBarStyleHorizontal.

The code below only works above API level 21

progressBar.setProgressTintList(ColorStateList.valueOf(Color.RED));

To create it via xml:

<ProgressBar        android:id="@+id/progressbar"        style="?android:attr/progressBarStyleHorizontal"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:indeterminate="true"        android:max="100"        android:backgroundTint="@color/white"        android:layout_below="@+id/framelauout"        android:indeterminateTint="#1a09d6"        android:layout_marginTop="-7dp"/>

In your activity

progressBar = (ProgressBar) findViewById(R.id.progressbar);

Showing/hiding the progress bar is the same

 progressBar.setVisibility(View.VISIBLE); // To show the ProgressBar  progressBar.setVisibility(View.INVISIBLE); // To hide the ProgressBar

Here is a sample image of what it would look like:

For more details:
1. Reference one
2. Reference Two

you can use AlertDialog as ProgressDialog refer below code for the ProgressDialog. This function you need to call whenever you show a progress dialog.

Code:

    public void setProgressDialog() {    int llPadding = 30;    LinearLayout ll = new LinearLayout(this);    ll.setOrientation(LinearLayout.HORIZONTAL);    ll.setPadding(llPadding, llPadding, llPadding, llPadding);    ll.setGravity(Gravity.CENTER);    LinearLayout.LayoutParams llParam = new LinearLayout.LayoutParams(            LinearLayout.LayoutParams.WRAP_CONTENT,            LinearLayout.LayoutParams.WRAP_CONTENT);    llParam.gravity = Gravity.CENTER;    ll.setLayoutParams(llParam);    ProgressBar progressBar = new ProgressBar(this);    progressBar.setIndeterminate(true);    progressBar.setPadding(0, 0, llPadding, 0);    progressBar.setLayoutParams(llParam);    llParam = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,            ViewGroup.LayoutParams.WRAP_CONTENT);    llParam.gravity = Gravity.CENTER;    TextView tvText = new TextView(this);    tvText.setText("Loading ...");    tvText.setTextColor(Color.parseColor("#000000"));    tvText.setTextSize(20);    tvText.setLayoutParams(llParam);    ll.addView(progressBar);    ll.addView(tvText);    AlertDialog.Builder builder = new AlertDialog.Builder(this);    builder.setCancelable(true);    builder.setView(ll);    AlertDialog dialog = builder.create();    dialog.show();    Window window = dialog.getWindow();    if (window != null) {        WindowManager.LayoutParams layoutParams = new WindowManager.LayoutParams();        layoutParams.copyFrom(dialog.getWindow().getAttributes());        layoutParams.width = LinearLayout.LayoutParams.WRAP_CONTENT;        layoutParams.height = LinearLayout.LayoutParams.WRAP_CONTENT;        dialog.getWindow().setAttributes(layoutParams);    }}

Output:

You can simply design an xml interface for your progressbar and pass it as a view to a AlertDialog, then show or dismiss the dialog anytime you want.

progress.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="horizontal"    android:padding="13dp"    android:layout_centerHorizontal="true"    android:layout_width="wrap_content"    android:layout_height="wrap_content">    <ProgressBar        android:id="@+id/loader"        android:layout_marginEnd="5dp"        android:layout_width="45dp"        android:layout_height="45dp" />    <TextView        android:layout_width="wrap_content"        android:text="Loading..."        android:textAppearance="?android:textAppearanceSmall"        android:layout_gravity="center_vertical"        android:id="@+id/loading_msg"        android:layout_toEndOf="@+id/loader"        android:layout_height="wrap_content" /></LinearLayout>

The code code that displays the progress dialog. Just copy this code and paste it your fragment.

  AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());       private void setDialog(boolean show){            builder.setView(R.layout.progress);            Dialog dialog = builder.create();            if (show)dialog.show();            else dialog.dismiss();        }

Then just call the method whenever you want to show the progressdialog and pass true as an argument to show it or false to dismiss the dialog.