使用firebaseui将firebase数据库中的子数据添加到cardview [英] Adding child data from firebase database to cardview using firebaseui

问题描述

我希望我的卡片视图显示我的firebase数据库中的reviewTitle和reviewDetails。我应该怎么做？我正在考虑添加此代码

$ b

'。child（userID）.child（Reviews）。child（reviewTitle）'和'。child（userID）.child（Reviews）。child（reviewDetails）'

但我不知道如何将它添加到我的代码（我正在使用firebaseui）。我的卡片视图目前显示空白。或者，如果还有另外一组代码，请让我知道。

这就是我的firebase数据库目前的样子：
这里

这是我的代码：

My Fragment

  public class MyReviews extends Fragment {
 
 private RecyclerView rv; 
私有FirebaseAuth firebaseAuth; 
 private DatabaseReference mDatabase; 
 
 LinearLayoutManager nwlinearLayoutManager; 
 
私有FirebaseRecyclerAdapter< ReviewInformation，ReviewsHolder> mFirebaseAdapter; 
 
 public MyReviews（）{
 
} 
 
 @Override 
 public view onCreateView（LayoutInflater inflater，ViewGroup container，
 Bundle savedInstanceState）{
 
查看rootView = inflater.inflate（R.layout.fragment_my_reviews，container，false）; 
 
 rv = rootView.findViewById（R.id.rv_recycler_view）; 
 rv.setHasFixedSize（true）; 
 nwlinearLayoutManager = new LinearLayoutManager（getActivity（））; 
 nwlinearLayoutManager.setStackFromEnd（true）; 
 
 
 firebaseAuth = FirebaseAuth.getInstance（）; 
 FirebaseUser user = firebaseAuth.getCurrentUser（）; 
 String userID = user.getUid（）; 
 mDatabase = FirebaseDatabase.getInstance（）。getReference（）; 
 Log.i（value1：，mDatabase.toString（））; 
 $ b mFirebaseAdapter = new FirebaseRecyclerAdapter< ReviewInformation，ReviewsHolder>（
 ReviewInformation.class，
 R.layout.card_item，
 ReviewsHolder.class，
 mDatabase） {
 @Override 
 public void populateViewHolder（ReviewsHolder holder，ReviewInformation chat，int position）{
 holder.reviewTitle.setText（chat.getReviewTitle（））; 
 holder.reviewDetails.setText（chat.getReviewDetails（））; 
} 
}; 
 
 mFirebaseAdapter.registerAdapterDataObserver（new RecyclerView.AdapterDataObserver（）{
 @Override $ b $ public void onItemRangeInserted（int positionStart，int itemCount）{
 super.onItemRangeInserted（positionStart， itemCount）; 
 int newsCount = mFirebaseAdapter.getItemCount（）; 
 int lastVisiblePosition = nwlinearLayoutManager.findLastVisibleItemPosition（）; 
 if（lastVisiblePosition == -1 ||（positionStart> =（newsCount -1 ）&& lastVisiblePosition ==（positionStart -1）））{
 rv.scrollToPosition（positionStart）; 
} 
} 
}）; 
 rv.setLayoutManager（nwlinearLayoutManager）; 
 rv.setAdapter（mFirebaseAdapter）; 
 mFirebaseAdapter.notifyDataSetChanged（）; 
 
 
 return rootView; 
 
 
 public static class ReviewsHolder extends RecyclerView.ViewHolder {
 $ b $ public TextView reviewTitle; 
 public TextView reviewDetails; 
 ImageView img; 
 public ReviewsHolder（查看itemView）{
 super（itemView）; 
 
 this.reviewTitle = itemView.findViewById（R.id.tv_text）; 
 this.reviewDetails = itemView.findViewById（R.id.tv_blah）; 
 // img = itemView.findViewById（R.id.beachImage）; 
 
 
 
 
 $ b code 
 
 
 
 
 My Data 
  public class ReviewInformation {
 
 public String reviewTitle; 
 public String reviewDetails; 
 
 public ReviewInformation（）{
 
 
 $ b public ReviewInformation（String reviewTitle，String reviewDetails）{
 this.reviewTitle = reviewTitle; 
 this.reviewDetails = reviewDetails; 
} 
 
 public String getReviewTitle（）{
 return reviewTitle; 
} 
 
 public void setReviewTitle（String reviewTitle）{
 this.reviewTitle = reviewTitle; 
} 
 
 public String getReviewDetails（）{
 return reviewDetails; 
} 
 
 public void setReviewDetails（String reviewDetails）{
 this.reviewDetails = reviewDetails; 
 
 
 $ / code $ 
 
 
解决方案
必须引用孩子 
 
 
  mDatabase = FirebaseDatabase.getInstance（）。getReference（）。child（Reviews）; 
  
希望这能起作用
 
I would like my card view to display the reviewTitle and reviewDetails from my firebase database. How should I do this? I was thinking of adding this code 

'.child(userID).child("Reviews").child("reviewTitle")'    and '.child(userID).child("Reviews").child("reviewDetails")' 

But I have no idea how to add it to my code (I am using firebaseui). My card view now currently shows a blank. Or if there is another set of code I should use, please do let me know.

This is how my firebase database currently looks like:
here

And this is my code:

My Fragment
public class MyReviews extends Fragment {

    private RecyclerView rv;
    private FirebaseAuth firebaseAuth;
    private DatabaseReference mDatabase;

    LinearLayoutManager nwlinearLayoutManager;

    private FirebaseRecyclerAdapter<ReviewInformation, ReviewsHolder> mFirebaseAdapter;

    public MyReviews() {

    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        View rootView = inflater.inflate(R.layout.fragment_my_reviews, container, false);

        rv = rootView.findViewById(R.id.rv_recycler_view);
        rv.setHasFixedSize(true);
        nwlinearLayoutManager = new LinearLayoutManager(getActivity());
        nwlinearLayoutManager.setStackFromEnd(true);


        firebaseAuth = FirebaseAuth.getInstance();
        FirebaseUser user = firebaseAuth.getCurrentUser();
        String userID = user.getUid();
        mDatabase = FirebaseDatabase.getInstance().getReference();
        Log.i("value1: ", mDatabase.toString());

        mFirebaseAdapter = new FirebaseRecyclerAdapter<ReviewInformation, ReviewsHolder>(
                ReviewInformation.class,
                R.layout.card_item,
                ReviewsHolder.class,
                mDatabase) {
            @Override
            public void populateViewHolder(ReviewsHolder holder, ReviewInformation chat, int position) {
                holder.reviewTitle.setText(chat.getReviewTitle());
                holder.reviewDetails.setText(chat.getReviewDetails());
            }
        };

        mFirebaseAdapter.registerAdapterDataObserver(new RecyclerView.AdapterDataObserver(){
            @Override
            public void onItemRangeInserted(int positionStart, int itemCount){
                super.onItemRangeInserted(positionStart, itemCount);
                int newsCount = mFirebaseAdapter.getItemCount();
                int lastVisiblePosition = nwlinearLayoutManager.findLastVisibleItemPosition();
                if(lastVisiblePosition == -1 || (positionStart>= (newsCount -1) && lastVisiblePosition == (positionStart -1))){
                    rv.scrollToPosition(positionStart);
                }
            }
        });
        rv.setLayoutManager(nwlinearLayoutManager);
        rv.setAdapter(mFirebaseAdapter);
        mFirebaseAdapter.notifyDataSetChanged();


        return rootView;
    }

    public static class ReviewsHolder extends RecyclerView.ViewHolder {

        public TextView reviewTitle;
        public TextView reviewDetails;
        ImageView img;
        public ReviewsHolder(View itemView) {
            super(itemView);

            this.reviewTitle= itemView.findViewById(R.id.tv_text);
            this.reviewDetails= itemView.findViewById(R.id.tv_blah);
            //img= itemView.findViewById(R.id.beachImage);


        }
    }
}
My Data
public class ReviewInformation {

    public String reviewTitle;
    public String reviewDetails;

    public ReviewInformation() {

    }

    public ReviewInformation(String reviewTitle, String reviewDetails) {
        this.reviewTitle = reviewTitle;
        this.reviewDetails = reviewDetails;
    }

    public String getReviewTitle() {
        return reviewTitle;
    }

    public void setReviewTitle(String reviewTitle) {
        this.reviewTitle = reviewTitle;
    }

    public String getReviewDetails() {
        return reviewDetails;
    }

    public void setReviewDetails(String reviewDetails) {
        this.reviewDetails = reviewDetails;
    }
}

解决方案
you  have to reference the child 
mDatabase = FirebaseDatabase.getInstance().getReference().child("Reviews");
Hope this will work

                        
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