addViewInLayout
fillDown
getView
ListView
完成view添加
返回要加载的View
获取view
方法内循环加载现在在屏幕上的Item
layoutChildren
ListAdapter
setItemViewLayoutParams
makeAndAddView
onLayout
返回view
setupChild
fillFromTop
obtainView
AbsListView
默认为普通模式LAYOUT_NORMAL,且childCount== 0