public void PageDown(){

        MotionEvent down = MotionEvent.obtain(
                1900
              , 1900
              , MotionEvent.ACTION_DOWN
              , 0
              , 100
              , 0);

        MotionEvent move = MotionEvent.obtain(
                1900
              , 2000
              , MotionEvent.ACTION_MOVE
              , 0
              , 0
              , 0);

        MotionEvent up = MotionEvent.obtain(
                1900
              , 1900
              , MotionEvent.ACTION_UP
              , 0
              , 100
              , 0);

        ListView.onTouchEvent(down);
        ListView.onTouchEvent(move);
        ListView.onTouchEvent(up);
   }