如何修复分别无法从Firebase存储和实时数据库检索的图像和数据？

Question

我保存了数据，即物品详细信息以及用于出售它们的图像。现在，我正尝试将这些详细信息与图像一起显示以进行出售，但很遗憾，没有显示任何内容。

我正在使用回收站视图和图像适配器来显示我的数据。

这是我检索数据的方式：-----

public class books extends AppCompatActivity {
private RecyclerView mRecyclerView;
private ImageAdapter mAdapter; 
private ProgressBar mProgressCircle;

DatabaseReference mDatabaseRef;
private List<post> mPosts;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_books);

    mRecyclerView = findViewById(R.id.recycler_view);
    mRecyclerView.setHasFixedSize(true);
    mRecyclerView.setLayoutManager(new LinearLayoutManager(this));

    mProgressCircle = findViewById(R.id.progress_circle);

    mPosts = new ArrayList<>();

    mDatabaseRef = FirebaseDatabase.getInstance().getReference("Items");

    mDatabaseRef.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            for (DataSnapshot postSnapshot : dataSnapshot.getChildren()) {
                post Post = postSnapshot.getValue(post.class);
                mPosts.add(Post);
            }

            mAdapter = new ImageAdapter(books.this, mPosts);

            mRecyclerView.setAdapter(mAdapter);
            mProgressCircle.setVisibility(View.INVISIBLE);
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {
            Toast.makeText(books.this, databaseError.getMessage(), Toast.LENGTH_SHORT).show();
            mProgressCircle.setVisibility(View.INVISIBLE);
        }
    });
}}

这是我的上课时间：----

public class post {
private String category;
private String itemnames;
private String desc;
private String cost;
private String contact;
private String imageurl;

public post() {
}

public post(String category_val, String itemname_val, String desc_val, String cost_val, String contact_val, String imageurl_val) {
    if (category_val.trim().equals("") && itemname_val.trim().equals("") && desc_val.trim().equals("") && cost_val.trim().equals("") && contact_val.trim().equals("") ) {
        category_val="No Category";
        itemname_val = "No Name";
        desc_val="No Desc";
        cost_val = "No Cost";
        contact_val="No Contact";
    }
    category = category_val;
    itemnames = itemname_val;
    desc = desc_val;
    cost = cost_val;
    contact = contact_val;
    imageurl = imageurl_val;
}

public String getCategory() {
    return category;
}
public void setCategory(String category_val) {
    category = category_val;
}


public String getitemname() {
    return itemnames;
}
public void setitemname(String itemname_val) {
    itemnames = itemname_val;
}


public String getdesc() {
    return desc;
}
public void setdesc(String desc_val) {
    desc = desc_val;
}


public String getcost() {
    return cost; }
public void setcost(String cost_val) {
    cost = cost_val;
}


public String getcontact() {
    return contact;
}
public void setcontact(String contact_val) {
    contact = contact_val;
}


public String getimageurl() {
    return imageurl; }
public void setimageurl(String imageurl_val) {
    imageurl = imageurl_val;
}}

这是我的图像适配器类：-----

    public class ImageAdapter extends RecyclerView.Adapter<ImageAdapter.ImageViewHolder> {
private Context mContext;
private List<post> mPosts; 
    ImageAdapter(Context context, List<post> posts) {
    mContext = context;
    mPosts = posts;
}

@Override
public ImageViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View v = LayoutInflater.from(mContext).inflate(R.layout.image_item, parent, false);
    return new ImageViewHolder(v);
}

@Override
public void onBindViewHolder(ImageViewHolder holder, int position) {
    post postCurrent = mPosts.get(position);
    holder.textViewCategory.setText(postCurrent.getCategory());
    holder.textViewName.setText(postCurrent.getitemname());
    holder.textViewDesc.setText(postCurrent.getdesc());
    holder.textViewCost.setText(postCurrent.getcost());
    holder.textViewContact.setText(postCurrent.getcontact());
    Picasso.with(mContext)
            .load(postCurrent.getimageurl())
            .fit()
            .centerInside()
            .into(holder.imageView);
}

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

public class ImageViewHolder extends RecyclerView.ViewHolder {
     TextView textViewName;
     TextView textViewCategory;
     TextView textViewDesc;
     TextView textViewCost;
     TextView textViewContact;
     ImageView imageView;

    ImageViewHolder(View itemView) {
        super(itemView);

        textViewCategory = itemView.findViewById(R.id.text_view_name_1);
        textViewName = itemView.findViewById(R.id.text_view_name_2);
        textViewDesc = itemView.findViewById(R.id.text_view_name_3);
        textViewCost = itemView.findViewById(R.id.text_view_name_4);
        textViewContact = itemView.findViewById(R.id.text_view_name_5);
        imageView = itemView.findViewById(R.id.image_view_upload);
    }
}}

我希望输出与图像一起显示为数据，但仅显示卡而不显示数据和图像。

我的输出：

Firebase数据库：