android退出一個含有listview的activity時報java.lang.IllegalA

@Override public void unregisterDataSetObserver(DataSetObserver observer) {    if (observer != null) {        super.unregisterDataSetObserver(observer);    } }

緣由是：

I too was having the same problem and it seems that unregisterDataSetObserver on your DealPageAdapter is being called twice. To fix the problem I overwrote the unregisterDataSetObserver in my Adapter as such

看不懂不要緊，總之是adapter的錯。查看代碼發現當請求到的listview的數據list爲空時，依然設置了adapter，並且代碼又被try catch包裹，因此沒有報錯。解決方法就是在設置adapter以前，判斷提供數據的list是否爲null，且其元素是否爲0.