@Override 
public boolean onInterceptTouchEvent(MotionEvent ev)  
{ 
  Log.d(TAG, "onInterceptTouchEvent-slop:"+mTouchSlop); 
 
  final int action = ev.getAction(); 
  if ((action == MotionEvent.ACTION_MOVE) && (mTouchState != TOUCH_STATE_REST)) 
  { 
    return true; 
  } 
 
  final float x = ev.getX(); 
  final float y = ev.getY(); 
 
  switch (action) 
  { 
  case MotionEvent.ACTION_MOVE: 
    final int xDiff = (int)Math.abs(mLastMotionX-x); 
    if (xDiff>mTouchSlop) 
    { 
      mTouchState = TOUCH_STATE_SCROLLING; 
    } 
    break; 
 
  case MotionEvent.ACTION_DOWN: 
    mLastMotionX = x; 
    mLastMotionY = y; 
    mTouchState = mScroller.isFinished()? TOUCH_STATE_REST : TOUCH_STATE_SCROLLING; 
    break; 
 
  case MotionEvent.ACTION_CANCEL: 
  case MotionEvent.ACTION_UP: 
    mTouchState = TOUCH_STATE_REST; 
    break; 
  } 
 
  return mTouchState != TOUCH_STATE_REST; 
}