ProgressBar + CountDownTimer

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:id="@+id/cdText"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <ProgressBar
        android:id="@+id/progressBar"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="285dp"
        android:layout_height="48dp"
        android:layout_marginTop="52dp"
        android:max="100"
        android:progress="40"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/cdText"
        app:layout_constraintVertical_bias="0.110000014" />

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.os.CountDownTimer;
import android.widget.ProgressBar;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    private TextView displayText;
    private ProgressBar progBar;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        displayText = findViewById(R.id.cdText);
        progBar = findViewById(R.id.progressBar);

        long msFuture = 30000;

        progBar.setMax((int)msFuture);


        new CountDownTimer(msFuture, 1000) {

            public void onTick(long msUntilFinished) {
                displayText.setText("remaining sec: " + msUntilFinished / 1000);
                progBar.setProgress((int)msUntilFinished);

            }
            public void onFinish() {
                displayText.setText("done!");

            }
        }.start();


    }
}