Android SeekBar Control Audio Sound Volume (AudioManager)

package com.myapp;


import java.io.IOException;

import android.media.AudioManager;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.Handler;
import android.app.Activity;
import android.content.Context;
import android.view.Menu;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.Button;
import android.view.MotionEvent;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TextView;

public class MainActivity extends Activity {

	private MediaPlayer mMedia;
	private Handler handler = new Handler();
	private SeekBar seekBar1;

	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        // call method ValumnControls()
        ValumnControls();
        
        
        if(mMedia != null){
       	 mMedia.release();  
        }
        
        final TextView txtView = (TextView)findViewById(R.id.textView1);
        txtView.setText("Source : music.mp3");
        
        /* Resource in R.
         * mMedia = MediaPlayer.create(this, R.raw.music);
         * mMedia.start();
         */
        
        /*
         * from DataSource
         * mMedia = new MediaPlayer();
         * mMedia.setDataSource("https://www.thaicreate.com/music/mymusic.mp3");
         * mMedia.start();
         * 
         */
        mMedia = MediaPlayer.create(this, R.raw.music);    
        
        // seekBar1 Control media
        seekBar1 = (SeekBar)findViewById(R.id.seekBar1);
        seekBar1.setMax(mMedia.getDuration());
        seekBar1.setOnTouchListener(new OnTouchListener() {
        	public boolean onTouch(View v, MotionEvent event) {
        		UpdateseekChange(v);
			return false; 
			}
		});



        
        final Button btn1 = (Button) findViewById(R.id.button1); // Start
        final Button btn2 = (Button) findViewById(R.id.button2); // Pause
        final Button btn3 = (Button) findViewById(R.id.button3); // Stop
        
        
        // Start
        btn1.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
            	txtView.setText("Playing : music.mp3....");
            	mMedia.start();
            	startPlayProgressUpdater();
            	btn1.setEnabled(false);
            	btn2.setEnabled(true);
            	btn3.setEnabled(true);
            }
        });
        
        // Pause
        btn2.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
            	txtView.setText("Pause : music.mp3");
            	mMedia.pause();
            	btn1.setEnabled(true);
            	btn2.setEnabled(false);
            	btn3.setEnabled(false);
            }
        });  
        
        // Stop
        btn3.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
            	txtView.setText("Stop Play : music.mp3");
            	mMedia.stop();
            	btn1.setEnabled(true);
            	btn2.setEnabled(false);
            	btn3.setEnabled(false);
            	try {
					mMedia.prepare();
					mMedia.seekTo(0);
				} catch (IllegalStateException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
            	
            }
        }); 
        
    }
    
    private void UpdateseekChange(View v){
    	if(mMedia.isPlaying()){
	    	SeekBar sb = (SeekBar)v;
	    	mMedia.seekTo(sb.getProgress());
		}
    }
    
    public void startPlayProgressUpdater() {
    	seekBar1.setProgress(mMedia.getCurrentPosition());

		if (mMedia.isPlaying()) {
			Runnable notification = new Runnable() {
		        public void run() {
		        	startPlayProgressUpdater();
				}
		    };
		    handler.postDelayed(notification,1000);
    	}
    } 
    
    
    @Override
    protected void onDestroy() {
   // TODO Auto-generated method stub
     super.onDestroy();
     if(mMedia != null){
    	 mMedia.release();  
     }
    }
    
    
    private void ValumnControls()
    {
        try
        {
        	SeekBar seekBar2 = (SeekBar)findViewById(R.id.seekBar2);
        	final AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
            seekBar2.setMax(audioManager
                    .getStreamMaxVolume(AudioManager.STREAM_MUSIC));
            seekBar2.setProgress(audioManager
                    .getStreamVolume(AudioManager.STREAM_MUSIC));   


            seekBar2.setOnSeekBarChangeListener(new OnSeekBarChangeListener() 
            {
                public void onStopTrackingTouch(SeekBar arg0) 
                {
                }

                public void onStartTrackingTouch(SeekBar arg0) 
                {
                }

                public void onProgressChanged(SeekBar arg0, int progress, boolean arg2) 
                {
                    audioManager.setStreamVolume(AudioManager.STREAM_MUSIC,
                            progress, 0);
                }
            });
        }
        catch (Exception e) 
        {
            e.printStackTrace();
        }
    }
    
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
	
}