listview 修改快速滑动的图片

try { 

   Field f = AbsListView.class.getDeclaredField("mFastScroller"); 

   f.setAccessible(true); 

   Object o=f.get(this); 

   f=f.getType().getDeclaredField("mThumbDrawable"); 

   f.setAccessible(true); 

   Drawable drawable=(Drawable) f.get(o); 

   drawable=getResources().getDrawable(R.drawable.icon); 

   f.set(o,drawable); 

} catch (Exception e) { 

e.printStackTrace();

}