java - 无法在fragment中实现Recycler View 适配器

Question

这个问题已经有答案了:

showing RecyclerView on fragment with data from Firebase (1 个回答)

已关闭 4 年前。

我无法在 fragment 中附加 Firestore Recycler 适配器。我用谷歌搜索了很多东西，但还没有什么好的。该 fragment 是底部选项卡布局的选项卡之一。数据是从单个集合中检索的。我想在单个 View 中表示多用户帖子列表。

我已经尝试了下面的代码，但还没有效果。

 public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        //just change the fragment_dashboard
        //with the fragment you want to inflate
        //like if the class is HomeFragment it should have R.layout.home_fragment
        //if it is DashboardFragment it should have R.layout.fragment_dashboard
       View view = inflater.inflate(R.layout.fragment_home, container, false);
        final FragmentActivity c = getActivity();
        LinearLayoutManager layoutManager = new LinearLayoutManager(c);

        Query query = PostsRef.orderBy("timestamp", Query.Direction.DESCENDING);
        FirestoreRecyclerOptions<PostsModel> options = new FirestoreRecyclerOptions.Builder<PostsModel>()
                .setQuery(query, PostsModel.class)
                .build();
        adapter = new PostsAdapter(options);
        recyclerView = (RecyclerView) view.findViewById(R.id.recycler_view);
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(c));
        recyclerView.setAdapter(adapter);

         mParent =view.findViewById(R.id.relative_home);
        return inflater.inflate(R.layout.fragment_home, null);


    }

适配器代码

public class PostsAdapter extends FirestoreRecyclerAdapter<PostsModel, PostsAdapter.PostsHolder> {
    private OnItemClickListener listener;

    public PostsAdapter(@NonNull FirestoreRecyclerOptions<PostsModel> options) {
        super(options);
    }

    @Override
    protected void onBindViewHolder(@NonNull PostsHolder holder, int position, @NonNull PostsModel model) {
        //retrieve the fields here
        holder.textViewTitle.setText(model.getPostTitle());
        holder.textViewDescription.setText(model.getPostContent());
        holder.textViewPriority.setText(String.valueOf(model.getSpinnerC()));
        holder.AuthorName.setText(model.getName());
        holder.AuthorGender.setText(model.getGender());
    }

    @NonNull
    @Override
    public PostsHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.post_list_layout,
                parent, false);
        return new PostsHolder(v);
    }

    public void deleteItem(int position) {
        getSnapshots().getSnapshot(position).getReference().delete();
    }

    class PostsHolder extends RecyclerView.ViewHolder {


        TextView textViewTitle;
        TextView textViewDescription;
        TextView textViewPriority;
        TextView AuthorName;
        TextView AuthorGender;

        public PostsHolder(View itemView) {
            super(itemView);
            textViewTitle = itemView.findViewById(R.id.quote1);
            textViewDescription = itemView.findViewById(R.id.name1);
            textViewPriority = itemView.findViewById(R.id.timestamp1);

                    }
    }

  }

Answer 1

您正在 onCreateView 方法中膨胀另一个 View 。

return inflater.inflate(R.layout.fragment_home, null);