Question

我希望我的RecyclerView项目能够识别它们被点击了。我正在使用FirestoreRecyclerAdapter，数据绑定，并尝试将所有内容保留在MVVM中。我已经尝试了StackOverflow以及其他产品上提供的许多不同解决方案，但是没有任何效果。

如下面的片段所示，在这一点上，我只是想让它给出一条错误消息，以确认单击是在发生。

AdminUserListFragment：

if

UserListViewModel：

public class AdminUserListFragment extends Fragment implements UserListAdapter.OnClickListener {

    private FragmentAdminUserListBinding binding;
    private AdminUserListViewModel adminListViewModel;
    private UserListAdapter userListAdapter;

    private FirebaseAuth auth = FirebaseAuth.getInstance();

    public AdminUserListFragment() {}

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setHasOptionsMenu(true);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        binding = FragmentAdminUserListBinding.inflate(inflater, container, false);
        final View v = binding.getRoot();

        // Gets ViewModel instance to observe its LiveData
        binding.setModel(adminListViewModel);
        adminListViewModel = ViewModelProviders.of(getActivity()).get(AdminUserListViewModel.class);
        adminListViewModel.init();

        adminListViewModel.getUsers().observe(this, new Observer<FirestoreRecyclerOptions<User>>() {
            @Override
            public void onChanged(@Nullable FirestoreRecyclerOptions<User> users) {
                initRecyclerView(users);
                userListAdapter.startListening();
            }
        });

        adminListViewModel.getIsUpdating().observe(this, new Observer<Boolean>() {
            @Override
            public void onChanged(@Nullable Boolean aBoolean) {
                if (!aBoolean) {
                    binding.rvUser.smoothScrollToPosition(adminListViewModel.getUsers().getValue().getSnapshots().size() - 1);
                }
            }

        });

        return v;
    }

    private void initRecyclerView(FirestoreRecyclerOptions<User> users) {
        userListAdapter = new UserListAdapter(users);
        binding.rvUser.setAdapter(userListAdapter);

        binding.rvUser.setHasFixedSize(true);
        binding.rvUser.setLayoutManager(new LinearLayoutManager(getContext()));
    }

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

    public void onStop() {
        super.onStop();
        userListAdapter.stopListening();
    }

    public void onItemClick() {
        Log.d("plum", "click");
    }
}

UserListAdapter：


public class AdminUserListViewModel extends ViewModel {

    private MutableLiveData<FirestoreRecyclerOptions<User>> users = new MutableLiveData<>();
    private FirestoreRepository repo;
    private MutableLiveData<Boolean> isUpdating = new MutableLiveData<>();

    public void init() {
        repo = FirestoreRepository.getInstance();
        users.setValue(repo.getUsersFromRepo());
    }

    public MutableLiveData<FirestoreRecyclerOptions<User>> getUsers() {
        return users;
    }

    public MutableLiveData<Boolean> getIsUpdating() {
        return isUpdating;
    }
}

fragment_admin_user_list xml：


public class UserListAdapter extends FirestoreRecyclerAdapter<User, UserListAdapter.UserViewHolder> {
    User currentUser = new User();

    // Listens for a Firestore query
    public UserListAdapter(@NonNull FirestoreRecyclerOptions<User> options) {
        super(options);
    }

    @NonNull
    @Override
    public UserViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext());
        RvuserItemBinding binding = RvuserItemBinding.inflate(layoutInflater, parent, false);

        return new UserViewHolder(binding);
    }

    // UserViewHolder is the class that defines the views that hold the User data
    class UserViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
        private RvuserItemBinding binding;
        OnClickListener onClickListener;

        public UserViewHolder(@NonNull RvuserItemBinding binding) {
            super(binding.getRoot());
            this.binding = binding;
        }

        public void bind(User user) {
            binding.setUser(user);
            binding.executePendingBindings();
        }
        public void onClick(View v) {
            onClickListener.onItemClick();

        }
    }

    @Override
    public void onBindViewHolder(@NonNull UserViewHolder holder, int position, User user) {
        holder.bind(user);
    }

    public interface OnClickListener{
        void onItemClick();
    }

}

rvuser_item xml：

<layout xmlns:bind="http://schemas.android.com/apk/res/android">
    <data>
    <variable
        name="model"
        type="...viewmodels.AdminUserListViewModel" />
    </data>

<androidx.coordinatorlayout.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/fragment_admin_list"
    app:layout_behavior="@string/appbar_scrolling_view_behavior">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rvUser"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@android:color/darker_gray"
        tools:listitem="@layout/rvuser_item" />

</androidx.coordinatorlayout.widget.CoordinatorLayout>
</layout>

谢谢！

FirestoreRecyclerAdapter不允许单击事件？

0 个答案: