The content of the adapter has changed but ListView did not receive a notification 异常解析
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很多新手在Android开发时可能对Thread和Message以及Handler、Looper概念不是很清楚,可能产生类似 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.的错误。在这里给出以下几点可以帮助你了解该问题:
1.改变适配器Adapter内容时不要在后台线程中,必须在UI线程中处理,这点可以通过Handler传出来解决。
2.尝试Adapter的notifyDataSetChanged()方法,当然主要看你代码的具体情况。
以上只貌似只是把错误信息翻译过来而已,真正的原因请看源代码:
mItemCount = mAdapter == null ? 0 : mAdapter.getCount();
..... //中间是其他代码就不拷贝了
else if (mItemCount != mAdapter.getCount()) {//这里可以看出为什么会抛出adapter has changed,是因为你可能还有线程在跑,更新了mAdapter.getCount();的返回值
throw new 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(" + getId() + ", " + getClass()
+ ") with Adapter(" + mAdapter.getClass() + ")]");
============
ps:知其然,知其所以然。刚开始我发现写不写notifyDataSetChanged()都能实现效果,于是我就把它注释了,直到出了问题,我看了以上内容,我就明白为什么会有adapter has changed的提示,也明白了notifyDataSetChanged()的含义。
我的理解是:增加了内容长度改变了 但是没有通知更新 当选中增加的那个内容时 就造成了 数组越界(或者别的问题)
所以添加内容后要更新。
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