Custom Volume bar using seek bar in android

 import android.app.Activity;

       import android.content.Context;

       import android.media.AudioManager;

       import android.os.Bundle;

       import android.view.KeyEvent;

       import android.widget.SeekBar;

       import android.widget.SeekBar.OnSeekBarChangeListener;

       public class VolumeActivity extends Activity

       {

              //a variable to store the seek bar from the XML file

              private SeekBar volumeBar;

              //an AudioManager object, to change the volume settings

              private AudioManager amanager;

              /** Called when the activity is first created. */

              @Override

              public void onCreate(Bundle savedInstanceState)

              {

                     super.onCreate(savedInstanceState);

                     setContentView(R.layout.main);

                     //get the seek bar from main.xml file

                     volumeBar = (SeekBar) findViewById(R.id.sb_volumebar);

                     //get the audio manager

                     amanager = (AudioManager) this.getSystemService(Context.AUDIO_SERVICE);

 volumeBar.setMax(amanager.getStreamMaxVolume(AudioManager.STREAM_MUSIC));

                     //set the seek bar progress to 1

                     volumeBar.setKeyProgressIncrement(1); 

                     //sets the progress of the seek bar based on the system's volume                     volumeBar.setProgress(amanager.getStreamVolume(AudioManager.STREAM_MUSIC)); 

               //register OnSeekBarChangeListener, so that the seek bar can change the volume

                     volumeBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener()

                     {

                           @Override

                           public void onStopTrackingTouch(SeekBar seekBar)

                           {}

                           @Override

                           public void onStartTrackingTouch(SeekBar seekBar)

                           {}

                           @Override

                           public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser)

                           {

             //change the volume, displaying a toast message containing the current volume and playing a feedback sound

                         amanager.setStreamVolume(AudioManager.STREAM_MUSIC,progress, 0);

                           }

                     });

              }

              @Override

              public boolean onKeyDown(int keyCode, KeyEvent event)

              {

                     //if one of the volume keys were pressed

              if(keyCode == KeyEvent.KEYCODE_VOLUME_DOWN || keyCode ==   KeyEvent.KEYCODE_VOLUME_UP)

                     {

                           //change the seek bar progress indicator position                           volumeBar.setProgress(amanager.getStreamVolume(AudioManager.STREAM_MUSIC));

                     }

                     //propagate the key event

                     return super.onKeyDown(keyCode, event);

              }

       }