Android The content of the adapter has changed but ListView did not receive a notification

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

原因：没有在主线程里通知。。。。

1、bug 出现的地方 listView.class 1487行

if (mItemCount == 0) {

                resetList();

                invokeOnItemScrollListener();

                return;

            } else if (mItemCount != mAdapter.getCount()) {

                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() + ")]");

            }

 

 

2、mItemCount != mAdapter.getCount()？

AdapterView.class  172行 

    @ViewDebug.ExportedProperty

    int mItemCount;//应该是上一次加载的数量，私有

 

3、AdapterView.class ？

ListView extends AbsListView

AbsListView extends AdapterView<ListAdapter>

 

4、网上主要解决方式

mAffairList.setVisibility(View.GONE);

mAdapter.notifyDataSetChanged();

mAffairList.setVisibility(View.VISIBLE);

 

只能解决主动通知时的情况，大多数情况是没有通知造成的

 

5、mAdapter.notifyDataSetChanged()  在做什么事？

点进去

class BaseAdapter

 public void notifyDataSetChanged() {

        mDataSetObservable.notifyChanged() ;

    }

点进去

class DataSetObservable

 public void notifyChanged() {

        synchronized(mObservers) {

            for (DataSetObserver observer : mObservers) {

                observer.onChanged();

            }

        }

    }

 

 点进去

abstract class DataSetObserver

public void onChanged() {

        // Do nothing

    }

 

AdapterView.class中

class AdapterDataSetObserver extends DataSetObserver {

 

        private Parcelable mInstanceState = null;

        @Override

        public void onChanged() { //实现方法

            mDataChanged = true;

            mOldItemCount = mItemCount;

            mItemCount = getAdapter().getCount();//关键地方

   ... ...

 

6、理论上的解决方式

listView所加载的list是静态的，大小不会变

只要list的size()变化了，就马上发通知

 

7、我的建议

只要list的size()变化了，就马上发通知

对主list的size()的改变与通知更新会存在时间差，滚动listView时不改变主list大小会大大减少bug产生，或者尽量减少动画