Android Studio - Progress Bar Code

mainActivity.java - code of ProgressBar

package com.example.raghukm.progressbar;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;

public class MainActivity extends AppCompatActivity {
    Button btn;
    ProgressBar pgBar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn=(Button)findViewById(R.id.button);
        pgBar=(ProgressBar)findViewById(R.id.progressBar);
    }
    public void clickBtn(View view) {
        Thread thread =new Thread(){

            public void run(){
                super.run();
                for(int i=0;i<=100;){
                    try{
                        sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    pgBar.setProgress(i);
                    i=i+1;
                }
            }
        };
        thread.start();
    }
}

activity_main.xml - code of ProgressBar

 <?xml version="1.0" encoding="utf-8"?>
  <android.support.constraint.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="com.example.raghukm.progressbar.MainActivity"
    android:background="@android:color/holo_green_light">

    <ProgressBar
        android:id="@+id/progressBar"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="352dp"
        android:layout_height="66dp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        android:layout_marginTop="115dp"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/button"
        android:layout_width="328dp"
        android:layout_height="46dp"
        android:text="Button"
        android:onClick="clickBtn"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
    </android.support.constraint.ConstraintLayout>

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