关于安卓自定义viewpager的问题

有没有人能给解释一下这段自定义的viewpager能实现什么效果么

 package com.sunking.water.utils.view;

import android.content.Context;
 import android.support.v4.view.ViewPager;
 import android.util.AttributeSet;
 import android.view.MotionEvent;

public class MyViewPager extends ViewPager {
private boolean noScroll = true;  

public MyViewPager(Context context, AttributeSet attrs) {  
    super(context, attrs);  
    // TODO Auto-generated constructor stub  
}  

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

public void setNoScroll(boolean noScroll) {  
    this.noScroll = noScroll;  
}  

@Override  
public void scrollTo(int x, int y) {  
    super.scrollTo(x, y);  
}  

@Override  
public boolean onTouchEvent(MotionEvent arg0) {  
    /* return false;//super.onTouchEvent(arg0); */  
    if (noScroll)  
        return false;  
    else  
        return super.onTouchEvent(arg0);  
}  

@Override  
public boolean onInterceptTouchEvent(MotionEvent arg0) {  
    if (noScroll)  
        return false;  
    else  
        return super.onInterceptTouchEvent(arg0);  
}  

@Override  
public void setCurrentItem(int item, boolean smoothScroll) {  
    super.setCurrentItem(item, smoothScroll);  
}  

@Override  
public void setCurrentItem(int item) {  
    super.setCurrentItem(item);  
}   


}