I am try to display the progress value of the seekBar but when it comes to the execution, there is no update on the value being display on the TextView. I wonder what alternatives than putting two classes onto one big class in order to archive this aim ?

The below is my code

VerticalSeekBar.java

package com.example.imagerotation;


import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.SeekBar;
import android.widget.Toast;

public class VerticalSeekBar extends SeekBar {

    public VerticalSeekBar(Context context) {
        super(context);
    }

    public VerticalSeekBar(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public VerticalSeekBar(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(h, w, oldh, oldw);
    }

    @Override
    protected synchronized void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(heightMeasureSpec, widthMeasureSpec);
        setMeasuredDimension(getMeasuredHeight(), getMeasuredWidth());
    }

    protected void onDraw(Canvas c) {
        c.rotate(-90);
        c.translate(-getHeight(), 0);

        super.onDraw(c);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (!isEnabled()) {
            return false;
        }

        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
            case MotionEvent.ACTION_MOVE:
            case MotionEvent.ACTION_UP:
                int progress = getMax() - (int) (getMax() * event.getY() / getHeight());
                setProgress(progress);
                onSizeChanged(getWidth(), getHeight(), 0, 0);
                //Toast.makeText(getContext(), String.valueOf(progress), Toast.LENGTH_SHORT).show();
                break;

            case MotionEvent.ACTION_CANCEL:
                break;
        }
        return true;
    }


}

MainActvity.java

package com.example.imagerotation;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;

public class MainActivity extends Activity {

    private VerticalSeekBar seek;
    private TextView by;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        seek = (VerticalSeekBar)findViewById(R.id.seekBar1);
        by = (TextView)findViewById(R.id.textView1);
        by.setText(String.valueOf(seek.getProgress()));

    }
}