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我试图把json数组放入recyclerview,但是当我运行它时,它给了我 “试图调用虚方法widget.RecyclerView.setLayoutManager在空对象引用”尝试在空对象上调用虚方法widget.RecyclerView.setLayoutManager参考
这是我的代码片段:
public class ShopsFragment extends Fragment {
private RecyclerView recyclerView;
private RecyclerView.LayoutManager layoutManager;
private RecyclerView.Adapter adapter;
private List<ShopsData> data_List;
public ShopsFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View rootView = inflater.inflate(R.layout.fragment_shops, container, false);
recyclerView = (RecyclerView) rootView.findViewById(R.id.recycler_view);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
data_List = new ArrayList<>();
StoresBackgroundTask backgroundTask = new StoresBackgroundTask(getActivity());
backgroundTask.execute();
return rootView;
}
}
,这里是我的onPreExecude代码:
@Override
protected void onPreExecute() {
recyclerView = (RecyclerView) activity.findViewById(R.id.recycler_view);
final LinearLayoutManager layoutManager = new LinearLayoutManager(ctx);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setHasFixedSize(true);
adapter = new StoresRecyclerAdapter(arrayList);
recyclerView.setAdapter(adapter);
}
我在onPreExecude的第4行发现错误。 有什么问题?
谢谢你,但它不起作用 –
如果你删除该行,你会得到哪个错误? –
和以前一样的错误 –