Question

因此，我正在开发一个向用户显示他正在从事的项目列表的应用程序。我正在使用firebase firestore和firestorerecycleradapter在recyclerview中显示列表。在将应用程序置于后台并再次打开之前，不会填充recyclerview。一旦在选项卡布局中更改了片段，recyclerview就会再次消失。我的系统的工作方式是将用户的访问ID与项目的访问ID匹配并显示它们。

大多数有相同问题的人都尝试从代码中删除行hasfixedsize（true）。但这对我不起作用。

这是OnCreateView方法

 @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_projects, container, false);
        user = mAuth.getCurrentUser();
        recyclerView = view.findViewById(R.id.projectsrv);
        recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));

        FirebaseApp.initializeApp(getContext());



        if (isDesignerCodeChanged() && user != null) {
            Query query = db.collection("projects")
                    .whereEqualTo("AccessID", AccessID);
            FirestoreRecyclerOptions<Projectsdata> options = new FirestoreRecyclerOptions.Builder<Projectsdata>()
                    .setQuery(query, Projectsdata.class)
                    .build();
            firestoreRecyclerAdapter = new FirestoreRecyclerAdapter(options);
            firestoreRecyclerAdapter.notifyDataSetChanged();
            recyclerView.setAdapter(firestoreRecyclerAdapter);
            return view;
        }




        // recyclerView.setAdapter(firestoreRecyclerAdapter);
        //     firestoreRecyclerAdapter.setOnItemClickListener(this);
        return view;
    }

OnStart方法

@Override
    public void onStart() {
        super.onStart();

        if (isDesignerCodeChanged() && user != null) {

            Query query = db.collection("projects")
                    .whereEqualTo("AccessID", AccessID);
            FirestoreRecyclerOptions<Projectsdata> options = new FirestoreRecyclerOptions.Builder<Projectsdata>()
                    .setQuery(query, Projectsdata.class)
                    .build();
            firestoreRecyclerAdapter = new FirestoreRecyclerAdapter(options);
            recyclerView.setAdapter(firestoreRecyclerAdapter);



        }
 firestoreRecyclerAdapter.startListening();
    }

OnStop方法

  @Override
    public void onStop() {
        super.onStop();
        Query query = db.collection("projects")
                .whereEqualTo("AccessID", AccessID);


        FirestoreRecyclerOptions<Projectsdata> options = new FirestoreRecyclerOptions.Builder<Projectsdata>()
                .setQuery(query, Projectsdata.class)
                .build();
        firestoreRecyclerAdapter = new FirestoreRecyclerAdapter(options);
        recyclerView.setAdapter(firestoreRecyclerAdapter);
        firestoreRecyclerAdapter.stopListening();
    }

OnCreate方法

@Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mAuth = FirebaseAuth.getInstance();
        user = mAuth.getCurrentUser();
        db = FirebaseFirestore.getInstance();


    }

我检查了logcat并发现以下行： 2019-05-22 22：40：44.007 7073-7073 / com.example.hellovorld E / RecyclerView：未连接适配器;跳过布局

在片段中使用firebaserecycleradapter启动应用程序时未加载数据

0 个答案: