ListView组件并没有提供修改快速滑块图像的API,因此不能直接修改快速滑块图像，所以通过反射技术修改快速滑块的图像    

    android:fastScrollEnabled="true"

  ListView lv=(ListView)findViewById(R.id.lv);

  // 获取FastScroller对象   try {    Field field = AbsListView.class.getDeclaredField("mFastScroller");    field.setAccessible(true);    Object obj = field.get(lv);    // 获取FastScroller.mTumbDrawable变量的Field对象    field = field.getType().getDeclaredField("mThumbDrawable");    field.setAccessible(true);    // 获取FastScroller.mThumbDrawable变量的值    Drawable drawable = (Drawable) field.get(obj);    // 装载新的快速滑块图像    drawable = getResources().getDrawable(R.drawable.ic_launcher);    // 重新设置快速滑块的图像    field.set(obj, drawable);   } catch (SecurityException e) {    // TODO Auto-generated catch block    e.printStackTrace();   } catch (NoSuchFieldException e) {    // TODO Auto-generated catch block    e.printStackTrace();   } catch (IllegalArgumentException e) {    // TODO Auto-generated catch block    e.printStackTrace();   } catch (IllegalAccessException e) {    // TODO Auto-generated catch block    e.printStackTrace();   }