列表数据更改时更新 Android ListActivity？
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Update Android ListActivity when list data changes?
提问by Simon
I wanted to know how to refresh a ListActivitywhen I change/add data to it.
我想知道如何ListActivity在更改/添加数据时刷新它。
I first thought that ListAdapterwould know when the list is changes, but when I have added elements to the list there is no update on the ListActivity, only when I close the ListActivity and reopen it again I see the changes occur.
我首先想到ListAdapter会知道列表何时更改，但是当我向列表添加元素时， 没有更新ListActivity，只有当我关闭 ListActivity 并再次重新打开它时，我才会看到更改发生。
So I searched for any method such as: update(), refesh()or something like that, but there is none.
It seems I haven't gotten the concept, can someone help me please?
所以我搜索了任何方法，例如：update(), refesh()或类似的方法，但没有。好像没懂这个概念，有没有大神帮帮我？
回答by CommonsWare
If you are using an ArrayAdapter, manipulate the contents of the list through the adapter -- do not touch the underlying list. There are add(), insert(), and remove()methods on ArrayAdapter.
如果您使用的是ArrayAdapter，则通过适配器操作列表的内容——不要触及底层列表。还有add()，insert()和remove()上的方法ArrayAdapter。
If you are using a CursorAdapter, run a requery()on the Cursor.
如果您使用的是CursorAdapter，请requery()在Cursor.
回答by bhatt4982
Try ArrayAdapter:notifyDataSetChanged
Google docs link
尝试ArrayAdapter:notifyDataSetChanged
Google 文档链接
回答by No Name
Maybe you should do this setListAdapter(listAdapter);
也许你应该这样做 setListAdapter(listAdapter);
