程序报了“java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Class java.lang.Object.getClass()' on a null object reference”的错误。。。最近写东西老是有空指针的错误
程序无法运行,报错信息先贴出来; 再就是没见过你这种写法的,正确写法如下: @Override public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View contentView = LayoutInflater.from(getActivity()).inflate(R.layout.fragment_blank, container, false); ListView listView = contentView.findViewById(R.id.listView); ArticleAdapter adapter = new ArticleAdapter(getActivity(), getData); return contentView; } private List<PsychologyMessage> getData() { List<PsychologyMessage> msgList= new ArrayList<PsychologyMessage>(); .. .. return msgList; }
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