v4中的PageAdapter的destroyItem，instantiateItem方法显示过时，这是什么情况的。
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The parameter type has been modified and View改成了ViewGroup使用destroyItem(ViewGroup, int, Object)与instantiateItem(ViewGroup, int) will be replaced by
View
ViewGroup
destroyItem(ViewGroup, int, Object)
instantiateItem(ViewGroup, int)
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The parameter type has been modified and
View改成了ViewGroup使用
destroyItem(ViewGroup, int, Object)与instantiateItem(ViewGroup, int)will be replaced by