【Android】adapter has changed解决方法

yeaperyeo 2010-08-27

【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

thrownewIllegalStateException("Thecontentoftheadapterhaschangedbut"

+"ListViewdidnotreceiveanotification.Makesurethecontentof"

+"youradapterisnotmodifiedfromabackgroundthread,butonly"

+"fromtheUIthread.[inListView("+getId()+","+getClass()

+")withAdapter("+mAdapter.getClass()+")]");

}

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