解决问题The content of the adapter has changed but ListView did not receive a notification.

出现的问题：
The content of the adapter has changed but ListView did not receive a notification. Make sure the content of your adapter is not modified from a background thread, but only from the UI thread. Make sure your adapter calls notifyDataSetChanged() when its content changes.
问题重现
情况是这样的：首先：ListView1嵌套ListView2，ListView1传入Adapter的数据里有一个List1，因为数据格式不是我想要的，所以我又在Adapter里new List2，把List1放入一个List2里面，之后把这个新生成的集合设置给ListView2，因为是ListView嵌套ListView，所以我在重新放数据的时候要把每个条目的List清空，所以就出现了这个问题。
解决问题
出现这问题是因为你的数据源变了报这个异常