Android Studio : How to Add and Use a Progress Bar

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="com.example.brandonmain.progressbarexample2.MainActivity">

<ProgressBar
android:id="@+id/progressbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:layout_margin="10dp"
style="@style/Widget.AppCompat.ProgressBar.Horizontal"
/>
<TextView
android:id="@+id/LoadingCompleteTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Loading Complete"
android:layout_below="@+id/progressbar"
android:layout_centerHorizontal="true"
android:layout_marginTop="16dp"
android:textSize="24sp"
android:visibility="invisible"
/>

</RelativeLayout>

MainActivity.java

import android.os.Handler;
	import android.support.v7.app.AppCompatActivity;
	import android.os.Bundle;
	import android.view.View;
	import android.widget.ProgressBar;
	import android.widget.TextView;
	public class MainActivity extends AppCompatActivity {
	private ProgressBar mProgressBar;
	private TextView mLoadingText;
	private int mProgressStatus = 0;
	private Handler mHandler = new Handler();
	@Override
	protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.activity_main);
	mProgressBar = (ProgressBar) findViewById(R.id.progressbar);
	mLoadingText = (TextView) findViewById(R.id.LoadingCompleteTextView);
	new Thread(new Runnable() {
	@Override
	public void run() {
	while (mProgressStatus < 100){
	mProgressStatus++;
	android.os.SystemClock.sleep(50);
	mHandler.post(new Runnable() {
	@Override
	public void run() {
	mProgressBar.setProgress(mProgressStatus);
	}
	});
	}
	mHandler.post(new Runnable() {
	@Override
	public void run() {
	mLoadingText.setVisibility(View.VISIBLE);
	}
	});
	}
	}).start();
	}
	} https://github.com/Salyder/progressbarExample/blob/master/app/src/main/java/com/example/brandonmain/progressbarexample2/MainActivity.java