Android - อยากทำให้เพลงที่เล่นจาก SoundPool เล่นได้มากกว่า 5 วินาทีครับ

package gpwiki.demo;

import android.content.Context;
import android.media.AudioManager;
import android.media.SoundPool;

public class SoundManager 
{
	private Context pContext;
	private SoundPool sndPool;
	private float rate = 1.0f;
	private float masterVolume = 1.0f;
	private float leftVolume = 1.0f;
	private float rightVolume = 1.0f;
    private float balance = 0.5f;
	
	// Constructor, setup the audio manager and store the app context
	public SoundManager(Context appContext)
	{
	  sndPool = new SoundPool(16, AudioManager.STREAM_MUSIC, 100);
 	  pContext = appContext;
	}
	
	// Load up a sound and return the id
	public int load(int sound_id)
	{
		return sndPool.load(pContext, sound_id, 1);
	}
	
	// Play a sound
	public void play(int sound_id)
	{
		sndPool.play(sound_id, leftVolume, rightVolume, 1, 0, rate); 	
	}	
	
	// Set volume values based on existing balance value
	public void setVolume(float vol)
	{
		masterVolume = vol;
		
		if(balance < 1.0f)
		{
			leftVolume = masterVolume;
			rightVolume = masterVolume * balance;
		}
		else
		{
			rightVolume = masterVolume;
			leftVolume = masterVolume * ( 2.0f - balance );
		}

	}
	
	public void setSpeed(float speed)
	{
		rate = speed;
		
		// Speed of zero is invalid 
		if(rate < 0.01f)
			rate = 0.01f;
		
		// Speed has a maximum of 2.0
		if(rate > 2.0f)
			rate = 2.0f;
	}
	
	public void setBalance(float balVal)
	{
		balance = balVal;
		
		// Recalculate volume levels
		setVolume(masterVolume);
	}
	

	
	// Free ALL the things!
	public void unloadAll()
	{
		sndPool.release();		
	}

}

package gpwiki.demo;

import android.app.Activity;
import android.media.AudioManager;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;

public class DemoMain extends Activity 
 {
	SoundManager snd;
	int laser, explode, pickup, meow, bark, moo, test;
	OnSeekBarChangeListener barChange;
	OnClickListener buttonClick;

    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        // Create an instance of our sound manger
        snd = new SoundManager(getApplicationContext());
        
        // Set volume rocker mode to media volume
        this.setVolumeControlStream(AudioManager.STREAM_MUSIC);
        
        // Load the samples from res/raw
        test = snd.load(R.raw.test);
        laser = snd.load(R.raw.laser);
        explode = snd.load(R.raw.explosion);
        pickup = snd.load(R.raw.pickup);
        meow = snd.load(R.raw.cat);
        bark = snd.load(R.raw.barkloud);
        moo = snd.load(R.raw.cow);
        
        // Create a seek bar handler
        barChange = new OnSeekBarChangeListener() 
        {
			@Override
			public void onStopTrackingTouch(SeekBar seekBar) {	}
			
			@Override
			public void onStartTrackingTouch(SeekBar seekBar) {  }
			
			@Override
			public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) 
			{
				switch (seekBar.getId())
				{
				 case R.id.VolBar1:
					 snd.setVolume((float)progress/100.0f);
					 break;
					 
				 case R.id.BalBar:
					 snd.setBalance((float)progress/100.0f);
					 break;
					 
				 case R.id.SpeedBar:
					 snd.setSpeed((float)progress/100.0f);
					 break;
				}
			}
		};
        
		// Set our handler as the ChangeListener for the seekbar controls  
        SeekBar sb;
        sb = (SeekBar)findViewById(R.id.SpeedBar);
        sb.setOnSeekBarChangeListener(barChange);
        
        sb = (SeekBar)findViewById(R.id.BalBar);
        sb.setOnSeekBarChangeListener(barChange);  
        
        sb = (SeekBar)findViewById(R.id.VolBar1);
        sb.setOnSeekBarChangeListener(barChange);
    }
     
    // Button listener assigned in XML layout
    public void clickHandler(View v)
    {
    	int id = v.getId(); // Use the button id to determine which sample should be played
    	
    	switch (id)
    	{
    	 case R.id.button1:
    	  snd.play(test);
    	  break;
    	  
    	 case R.id.button2:
    	  snd.play(explode);
    	  break;
    	   
    	 case R.id.button3:
       	  snd.play(pickup);
       	  break;    	  
       	  
    	 case R.id.button4:
          snd.play(meow);
          break;    	  
          	  
    	 case R.id.button5:
          snd.play(bark);
          break;    	  
          	  
    	 case R.id.button6:
          snd.play(moo);
          break;    	  
    	}
    }
 }