Android: SeekBar Schieberegler

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:id="@+id/textViewOutput"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Output value"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true"
        android:height="40sp"
        android:width="200sp"
        android:textSize="22sp"
/>

    <SeekBar
        android:id="@+id/seekBar"
        android:layout_width="match_parent"
        android:layout_height="50sp"
        android:layout_alignParentBottom="true"
        android:elevation="5sp" />

</RelativeLayout>

package com.example.demo_light;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

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

        TextView textViewOutput =findViewById(R.id.textViewOutput);
        SeekBar seekBar=findViewById(R.id.seekBar);
        seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            int seekBarValue=0;
            @Override
            public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
                seekBarValue =i;
                textViewOutput.setText("Seekbar=" + i);
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                Toast.makeText(MainActivity.this, "Seek bar progress is :" + seekBarValue,
                        Toast.LENGTH_SHORT).show();
                textViewOutput.setText("Seekbar=" + seekBarValue);
            }
        });

    }
}