Android Can'；t从Firebase获取Post生成的密钥以在子级中添加注释

嘿，伙计们，我正在尝试使用Firebase实时数据库构建一个社交媒体应用程序

但是我陷入了如何获得

posts-generated-key

以在其中添加评论的困境，因此如何获得生成到post的push-key以及如何在单击的post中显示评论

数据库结构

以下是当我在Recyclerview中单击帖子时显示帖子详细信息的活动，它让我参与此活动

这是用于将数据发送到Recyclerview并获取putExtra的适配器

你可以试试这个

  mDatabase.child("Posts").child("Books").addValueEventListener(new ValueEventListener() {
final ArrayList<String> keysArray= new ArrayList<String>(); // if you want to store all the keys
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {

                for (DataSnapshot data : dataSnapshot.getChildren()){
                    String key = data.getKey(); //Here you can get all your keys from Books
                    keysArray.add(key);
                }


            }

            @Override
            public void onCancelled(DatabaseError databaseError) {
                Toast.makeText(view.getContext(),"database error",
                        Toast.LENGTH_SHORT).show();
            }
        });

mDatabase.child（“Posts”）.child（“Books”）.addValueEventListener（新的ValueEventListener（））{
final ArrayList keysArray=new ArrayList（）；//如果要存储所有键
@凌驾
公共void onDataChange（DataSnapshot DataSnapshot）{
对于（DataSnapshot数据：DataSnapshot.getChildren（））{
String key=data.getKey（）；//在这里，您可以从书本中获取所有密钥
keysArray.add（key）；
}
}
@凌驾
已取消的公共void（DatabaseError DatabaseError）{
Toast.makeText（view.getContext（），“数据库错误”，
吐司。长度（短）。show（）；
}
});

我希望在BooksAdapter中的post\u Id中存储生成的post键，这样当我在recycler视图中单击post时，我会发送带有Intent.putExtra的Id

 public class BooksAdapter extends RecyclerView.Adapter<BooksAdapter.BooksItemsHolder> {

    public BooksAdapter(List<BooksLists> listy, Context mContext) {
        this.listy = listy;
        this.mContext = mContext;
    }

    public List<BooksLists> listy ;
    Context mContext;

    @NonNull
    @Override
    public BooksItemsHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_item,parent,false);
        BooksItemsHolder holder = new BooksItemsHolder(v);
        return holder;

    }

    @Override
    public void onBindViewHolder(@NonNull final BooksItemsHolder holder, int position) {

        final BooksLists list = listy.get(position);

        holder.PostTitle.setText(list.getPost_title());
        holder.PostDate.setText(list.getPost_datetime());

        GlideApp.with(mContext)
                .load(list.getPost_image())
                .into(holder.imgPostCover);



        holder.UserProfileName.setText(list.getUser_name());

        GlideApp.with(mContext)
                .load(list.getUser_pp())
                .placeholder(R.drawable.user)
                .into(holder.TheUserProfilePic);

        holder.linearLayout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Intent intent = new Intent(mContext,ShowThePost.class);

                intent.putExtra("post_ID",list.getPost_id());
                intent.putExtra("post_Title",list.getPost_title());
                intent.putExtra("post_Desc",list.getPost_description());
                intent.putExtra("post_Image",list.getPost_image());
                intent.putExtra("post_DateTime",list.getPost_datetime());
                intent.putExtra("post_Price",list.getPost_real_price());
                intent.putExtra("post_Currency",list.getCurrency());
                intent.putExtra("post_UserName",list.getUser_name());
                intent.putExtra("post_UserProfilePicture",list.getUser_pp());
                intent.putExtra("category",list.getCategory());


                mContext.startActivity(intent);


            }
        });

    }

    @Override
    public int getItemCount() {
        return listy.size();
    }

    public class BooksItemsHolder extends RecyclerView.ViewHolder {

        @BindView(R.id.TheuserProfilePicture)
        CircularImageView TheUserProfilePic;
        @BindView(R.id.userName) TextView  UserProfileName;
        @BindView(R.id.imgPostShow) ImageView imgPostCover;
        @BindView(R.id.postTitle) TextView PostTitle;
        @BindView(R.id.txt_Post_Date) TextView PostDate;
        @BindView(R.id.GotoPostItem)
        CardView linearLayout;
        public BooksItemsHolder(View itemView) {
            super(itemView);
            ButterKnife.bind(this,itemView);


        }
    }


}

    public class CommentsList {



    public CommentsList() {
    }

    String userID;
    String userName;
    String userProfilePicture;
    String commentDate;
    String commentSuggestPrice;
    String CommentDescription;

    public String getUserID() {
        return userID;
    }

    public void setUserID(String userID) {
        this.userID = userID;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getUserProfilePicture() {
        return userProfilePicture;
    }

    public void setUserProfilePicture(String userProfilePicture) {
        this.userProfilePicture = userProfilePicture;
    }

    public String getCommentDate() {
        return commentDate;
    }

    public void setCommentDate(String commentDate) {
        this.commentDate = commentDate;
    }

    public String getCommentSuggestPrice() {
        return commentSuggestPrice;
    }

    public void setCommentSuggestPrice(String commentSuggestPrice) {
        this.commentSuggestPrice = commentSuggestPrice;
    }

    public String getCommentDescription() {
        return CommentDescription;
    }

    public void setCommentDescription(String commentDescription) {
        CommentDescription = commentDescription;
    }

    public CommentsList(String userID, String userName, String userProfilePicture, String commentDate, String commentSuggestPrice, String commentDescription) {
        this.userID = userID;
        this.userName = userName;
        this.userProfilePicture = userProfilePicture;
        this.commentDate = commentDate;
        this.commentSuggestPrice = commentSuggestPrice;
        CommentDescription = commentDescription;
    }




}

  mDatabase.child("Posts").child("Books").addValueEventListener(new ValueEventListener() {
final ArrayList<String> keysArray= new ArrayList<String>(); // if you want to store all the keys
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {

                for (DataSnapshot data : dataSnapshot.getChildren()){
                    String key = data.getKey(); //Here you can get all your keys from Books
                    keysArray.add(key);
                }


            }

            @Override
            public void onCancelled(DatabaseError databaseError) {
                Toast.makeText(view.getContext(),"database error",
                        Toast.LENGTH_SHORT).show();
            }
        });