代码如下：
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
// TODO
if ((e1.getX() - e2.getX() > VALUE_DISTANCE)
&& Math.abs(velocityX) > VALUE_SPEED) {
moveNextOrPrevious(1);
Log.d("TAG","[+++++++++++][onFling][Fling left]");
} else if ((e2.getX() - e1.getX() > VALUE_DISTANCE)
&& Math.abs(velocityX) > VALUE_SPEED) {
moveNextOrPrevious(-1);
Log.d("TAG","[+++++++++++][onDown][Fling right]");
}
return true;
}