android 关于gallery 的平滑代码滚动

MotionEvent e1 = MotionEvent.obtain(
    SystemClock.uptimeMillis(), 
    SystemClock.uptimeMillis(),  
    MotionEvent.ACTION_DOWN, 89.333336f, 265.33334f, 0);
MotionEvent e2 = MotionEvent.obtain(
    SystemClock.uptimeMillis(), 
    SystemClock.uptimeMillis(), 
    MotionEvent.ACTION_UP, 300.0f, 238.00003f, 0);

gallery.onFling(e1, e2, -800, 0);

http://stackoverflow.com/questions/5006228/smoothly-scroll-to-specified-position-in-android-gallery