如何将子firebase数据库中的特定名称获取到recyclerview？

Posted 2023-04-19

【中文标题】如何将子firebase数据库中的特定名称获取到recyclerview？

【英文标题】：How to get specific name inside child firebase database into recyclerview?

【发布时间】：2021-10-08 02:43:01

【问题描述】：

我有点困惑，如何在子键中获取特定名称，我只知道 set recyclerview，但不知道如何将 grandprice 设置为 TextView，因为 grandprice 在另一个子键中，我的数据库在下面。

key 是 CardView，grandprice 是 TextView。

这是我的代码

//RecyclerView
mRecyclerView = view.findViewById(R.id.recommeneded);
mRecyclerView.setHasFixedSize(true);
//mRecyclerView.setLayoutManager(new LinearLayoutManager(HomeActivity.this));
final RecyclerView.LayoutManager mLayoutManager = new GridLayoutManager(getActivity(), 1);
mRecyclerView.setLayoutManager(mLayoutManager);

mProgressBar = view.findViewById(R.id.myDataLoaderProgressBar);
mProgressBar.setVisibility(View.VISIBLE);

final int position = 0;
recommended = new ArrayList<>();
mAdapter = new InvoiceAdapter(getActivity(), recommended);
mRecyclerView.setAdapter(mAdapter);
//mAdapter.setOnItemClickListener(HomeActivity.this);

rootRef = FirebaseDatabase.getInstance().getReference();
usersRef = rootRef.child("order");
uid = FirebaseAuth.getInstance().getCurrentUser().getUid();

mDBListener = usersRef.child(uid).addValueEventListener(new ValueEventListener() 
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) 

        recommended.clear();

        for (DataSnapshot invoiceSnapshot : dataSnapshot.getChildren()) 
            InvoiceModels upload = invoiceSnapshot.getValue(InvoiceModels.class);
            upload.setKey(invoiceSnapshot.getKey());
            recommended.add(position, upload);
            
        
        mAdapter.notifyDataSetChanged();
        mProgressBar.setVisibility(View.GONE);
    

    @Override
    public void onCancelled(DatabaseError databaseError) 
        Toast.makeText(getActivity(), databaseError.getMessage(), Toast.LENGTH_SHORT).show();
        mProgressBar.setVisibility(View.INVISIBLE);
    
);
//RecyclerView

我的适配器

@Override
    public void onBindViewHolder(RecyclerViewHolder holder, final int position) 

        InvoiceModels currentProduct = recomended.get(position);

        //holder.totalPrice.setText(currentProduct.getTotalPrice());
        Toast.makeText(mContext, currentProduct.getTotalPrice(), Toast.LENGTH_SHORT).show();

    

    @Override
    public int getItemCount() 
        return recomended.size();
    

    public class RecyclerViewHolder extends RecyclerView.ViewHolder 

        TextView totalPrice;

        public RelativeLayout relativelayout;


        public RecyclerViewHolder(View itemView) 
            super(itemView);
            totalPrice = itemView.findViewById(R.id.totalPrice);

            relativelayout = (RelativeLayout) itemView.findViewById(R.id.relativeLayout);


        

    

衷心感谢您的帮助， 阿尔。

【问题讨论】：

问题解决了吗？

不，还没有！但是当我解决问题时我会检查/评论，谢谢

好的，让我知道。

【参考方案1】：

首先，您需要获取 inv-details 的 id。接下来就可以调用里面的数据了。你可以试试这个。

recommended.clear();
//At here you get the id first.
final String keyOfChild = dataSnapshot.getKey();
usersRef.child(uid).child(keyOfChild).child("inv-details").addValueEventListener(new ValueEventListener() 
@Override
public void onDataChange(DataSnapshot dataSnapshot) 

   InvoiceModels upload = dataSnapshot.getValue(InvoiceModels.class);
   upload.setKey(invoiceSnapshot.getKey());
   recommended.add(position, upload);

   mAdapter.notifyDataSetChanged();
   mProgressBar.setVisibility(View.GONE);