【Android】adapter has changed解决方法

【Android】adapter has changed解决方法

 

      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() + ")]");
            }