Android编程实现Gallery中每次滑动只显示一页的方法

import android.content.Context;
import android.util.AttributeSet;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.widget.Gallery;
public class DetialGallery extends Gallery {
  public DetialGallery(Context context ,AttributeSet attrSet) {
   super(context,attrSet);
   // TODO Auto-generated constructor stub
  }
  private boolean isScrollingLeft(MotionEvent e1, MotionEvent e2)
  {
   return e2.getX() > e1.getX();
  }
  @Override
  public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
  // TODO Auto-generated method stub
  // return super.onFling(e1, e2, 0, velocityY);
  //方法一：只去除翻页惯性
  // return false;
  //方法二：只去除翻页惯性 注：没有被注释掉的代码实现了开始说的2种效果。
  int kEvent;
  if(isScrollingLeft(e1, e2)){
  //Check if scrolling left
  kEvent = KeyEvent.KEYCODE_DPAD_LEFT;
  } else{
  //Otherwise scrolling right
  kEvent = KeyEvent.KEYCODE_DPAD_RIGHT;
  }
  onKeyDown(kEvent, null);
  return true;
 }
}