Android studio - SeekBar code

mainActivity.java - code of SeekBar

package com.example.raghukm.seek;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
SeekBar skbar;
TextView textView;

@Override
 protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    textView=(TextView)findViewById(R.id.textView);
     skbar=(SeekBar)findViewById(R.id.seekBar);
     skbar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
         @Override
        public void onProgressChanged(SeekBar skBar, int i, boolean b) {
                textView.setText("The Value of SeekBar is: "+i);
            }

            @Override
         public void onStartTrackingTouch(SeekBar seekBar) {
           Toast.makeText(getApplicationContext(),"SeekBar tracking Start",Toast.LENGTH_LONG).show();
         }

        @Override
        public void onStopTrackingTouch(SeekBar seekBar) {
          Toast.makeText(getApplicationContext(),"SeekBar tracking stop",Toast.LENGTH_SHORT).show();
           }
     });
 }
}

activity_main.xml - code of SeekBar

 <?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.seek.MainActivity">

   <SeekBar
        android:id="@+id/seekBar"
        android:layout_width="276dp"
        android:layout_height="36dp"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginTop="92dp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        tools:layout_editor_absoluteX="-62dp" />

   <TextView
        android:id="@+id/textView"
        android:layout_width="336dp"
        android:layout_height="132dp"
        android:text="TextView"
        android:textSize="30dp"
        android:textAlignment="center"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        android:layout_marginTop="61dp"
        app:layout_constraintTop_toBottomOf="@+id/seekBar"
        app:layout_constraintHorizontal_bias="0.507" />
  </android.support.constraint.ConstraintLayout>

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