Question

您能在我的代码中看到问题吗？我得到了这个例外：

java.lang.NullPointerException:  
Attempt to invoke virtual method 'void android.support.v7.widget.RecyclerView.setLayoutManager(android.support.v7.widget.RecyclerView$LayoutManager)' on a null object reference

使用此代码：

RecyclerView recyclerView;
RecyclerView.Adapter adapter;

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.latest_events_fragment, container, false);

    recyclerView = (RecyclerView)view.findViewById(R.id.events_recycler);
    LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getActivity());
    recyclerView.setLayoutManager(linearLayoutManager );
    list.add("A");
    list.add("B");
    list.add("C");;
    // specify an adapter
    adapter = new EventsRecyclerAdapter(list);
    recyclerView.setAdapter(adapter);


    return view;
}

这是我的.xml文件，它被称为events_list.xml `

`

Answer 1

您的回收商视图对象为空。尝试在此处找到它时，请确保使用正确的ID：

recyclerView = (RecyclerView)view.findViewById(R.id.events_recycler);

如果ID正确，请确保使用所需的布局。

这个代码我有什么问题：导致java.lang.NullPointerException

1 个答案: