seekbar android

JAVA FILE

package com.example.viraj.blog_10_seekbar;

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 {
private SeekBar sb1;
    private TextView tv1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        sb1=(SeekBar)findViewById(R.id.id_seekbar);
        tv1=(TextView)findViewById(R.id.id_textView);
        //pahale he 0 /10 display karane ke liye
        tv1.setText("SEEKBAR : " + sb1.getProgress() +"/"+sb1.getMax());

        sb1.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                tv1.setText("SEEKBAR : " + progress +"/"+seekBar.getMax());
            }

            @Override // TRACKING STOP START KUCH BHI TEXT LIKHATE HE 
            public void onStartTrackingTouch(SeekBar seekBar) {
                Toast.makeText(getApplicationContext(),"TRACKING START",Toast.LENGTH_LONG).show();
            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                Toast.makeText(getApplicationContext(),"TRACKING STOP",Toast.LENGTH_LONG).show();
            }
        });
    }
}

XML FILE

<?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"

    android:background="#FFEB3B"

    tools:context="com.example.viraj.blog_10_seekbar.MainActivity">

    <SeekBar

        android:id="@+id/id_seekbar"

        android:layout_width="300dp"

        android:layout_height="wrap_content"

        tools:layout_editor_absoluteY="229dp"

        android:layout_marginRight="8dp"

        app:layout_constraintRight_toRightOf="parent"

        android:layout_marginLeft="8dp"

        android:max="10"

        app:layout_constraintLeft_toLeftOf="parent" />

    <TextView

        android:id="@+id/id_textView"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="TextView"

        android:layout_marginRight="8dp"

        app:layout_constraintRight_toRightOf="parent"

        android:layout_marginLeft="8dp"

        app:layout_constraintLeft_toLeftOf="parent"

        android:layout_marginTop="8dp"

        app:layout_constraintTop_toBottomOf="@+id/id_seekbar"

        app:layout_constraintBottom_toBottomOf="parent"

        android:layout_marginBottom="8dp" />

</android.support.constraint.ConstraintLayout>