Android，ListView IllegalStateException:“适配器的内容已更改但ListView未收到通知"； [英] Android, ListView IllegalStateException: "The content of the adapter has changed but ListView did not receive a notification"
问题描述
我想要做什么:运行一个后台线程，计算 ListView 内容并部分更新 ListView，同时计算结果.
What I want to do: run a background thread which calculates ListView contents and update ListView partially, while results are calculated.
我知道我必须避免的事情:我不能弄乱后台线程中的 ListAdapter 内容，所以我继承了 AsyncTask 并从 onProgressUpdate 发布结果(向适配器添加条目).我的适配器使用结果对象的 ArrayList，对这些数组列表的所有操作都是同步的.
What I know I have to avoid: I cannot mess with ListAdapter contents from background thread, so I inherited AsyncTask and publish result (add entries to adapter) from onProgressUpdate. My Adapter uses ArrayList of result objects, all operations on those arraylists are synchronized.
其他人的研究:有非常有价值的数据此处.对于大约 500 名用户，我几乎每天都遇到崩溃，当我在 onProgressUpdate 中添加 list.setVisibility(GONE)/trackList.setVisibility(VISIBLE) 块时，崩溃降低了 10 倍，但是没有消失.(这是在 answer 中提出的)
Research of other people: there is very valuable data here. I also suffered from almost daily crashes for group of ~500 users, and when I added list.setVisibility(GONE)/trackList.setVisibility(VISIBLE) block in onProgressUpdate, crashes lowered by a factor of 10 but not disappeared. (it was suggested in answer )
我有时会得到什么:请注意，这种情况很少发生(对于 3.5k 用户中的一个，每周一次).但我想彻底摆脱这个错误.这是部分堆栈跟踪:
What I got sometimes: please notice, it happens really rarely (once a week for one of 3.5k users). But I'd like to get rid of this bug completely. Here is partial stacktrace:
`java.lang.IllegalStateException:` 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. [in ListView(2131296334, class android.widget.ListView) with Adapter(class com.transportoid.Tracks.TrackListAdapter)]
at android.widget.ListView.layoutChildren(ListView.java:1432)
at android.widget.AbsListView.onTouchEvent(AbsListView.java:2062)
at android.widget.ListView.onTouchEvent(ListView.java:3234)
at android.view.View.dispatchTouchEvent(View.java:3709)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:852)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
[...]
帮助?不再需要，见下文
最终答案: 事实证明，我每插入 5 次就调用 notifyDataSetChanged 以避免闪烁和突然的列表更改.不能这样做，当基本列表更改时总是通知适配器.这个错误现在对我来说早就消失了.
FINAL ANSWER: As it turned out, I was calling notifyDataSetChanged every 5 insertions to avoid flickering and sudden list changes. It cannot be done such way, always notify adapter when base list changes. This bug it long gone for me now.
推荐答案
我遇到了同样的问题.
我在 UI 线程之外向 ArrayList 添加项目.
I was adding items to my ArrayList outside the UI thread.
解决方案:我已经完成了两个操作，添加项目并在 UI 线程中调用 notifyDataSetChanged().
Solution: I have done both, adding the items and called notifyDataSetChanged() in the UI thread.
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