Tutorial

<LinearLayout 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"
    android:orientation="vertical"
    android:gravity="center"
    tools:context=".MainActivity" >
    
    <TextView android:id="@+id/text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        />

    <SeekBar android:id="@+id/seek"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        />
    
</LinearLayout>

public class MainActivity extends Activity implements OnSeekBarChangeListener{

private SeekBar seekBar;
private TextView textView;

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

seekBar = (SeekBar)findViewById(R.id.seek);
textView = (TextView)findViewById(R.id.text);

textView.setText("Value: " + seekBar.getProgress());
seekBar.setOnSeekBarChangeListener(this);
}

@Override
public void onProgressChanged(SeekBar sb, int progress, boolean fromUser){
textView.setText("Value: " + seekBar.getProgress());
}

@Override
public void onStopTrackingTouch(SeekBar sb){
textView.setTypeface(null);
}

@Override
public void onStartTrackingTouch(SeekBar sb){
textView.setTypeface(null, Typeface.BOLD);
}

package com.kircode.codeforfood_test;

import android.app.Activity;
import android.graphics.Typeface;
import android.os.Bundle;
import android.view.Menu;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TextView;

public class MainActivity extends Activity implements OnSeekBarChangeListener{

private SeekBar seekBar;
private TextView textView;

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

seekBar = (SeekBar)findViewById(R.id.seek);
textView = (TextView)findViewById(R.id.text);

textView.setText("Value: " + seekBar.getProgress());
seekBar.setOnSeekBarChangeListener(this);
}

@Override
public void onProgressChanged(SeekBar sb, int progress, boolean fromUser){
textView.setText("Value: " + seekBar.getProgress());
}

@Override
public void onStopTrackingTouch(SeekBar sb){
textView.setTypeface(null);
}

@Override
public void onStartTrackingTouch(SeekBar sb){
textView.setTypeface(null, Typeface.BOLD);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}

}