Progress Bar in Android

Progress bars are used to show progress of a task. For example, when you are uploading or downloading something from the internet, it is better to show the progress of download/upload to the user.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
    tools:context=".MainActivity" >

    <ProgressBar
        android:id="@+id/progressBar1"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="23dp"
        android:layout_marginTop="20dp"
        android:indeterminate="false"
        android:max="100"
        android:minHeight="50dp"
        android:minWidth="200dp"
        android:progress="1" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/progressBar1"
        android:layout_below="@+id/progressBar1"/>

</RelativeLayout>

MainActivity.kt

package com.androidian.progressbar

import android.os.Bundle
import android.os.Handler
import android.view.View
import android.widget.ProgressBar
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity

class MainActivity : AppCompatActivity() {
    private var progressBar: ProgressBar? = null
    private var progressStatus = 0
    private var textView: TextView? = null
    private val handler = Handler()
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        progressBar = findViewById<View>(R.id.progressBar1) as ProgressBar
        textView = findViewById<View>(R.id.textView1) as TextView
        // Start long running operation in a background thread
        Thread {
            while (progressStatus < 100) {
                progressStatus += 1
                // Update the progress bar and display the
                //current value in the text view
                handler.post {
                    progressBar!!.progress = progressStatus
                    textView!!.text = progressStatus.toString() + "/" + progressBar!!.max
                }
                try {
                    // Sleep for 200 milliseconds.
                    //Just to display the progress slowly
                    Thread.sleep(200)
                } catch (e: InterruptedException) {
                    e.printStackTrace()
                }
            }
        }.start()
    }
}