Question

我想显示按数据库值（numLike）排序的帖子。

我希望只有收到超过10条建议的帖子将被打印。它运行正常，没有错误。

但是值小于10的帖子也被打印。

我已经两天没有解决这个问题了……

 final ArrayList<Integer> arrayList = new ArrayList<>();DatabaseReference dbRef = FirebaseDatabase.getInstance().getReference("posts");
    dbRef.addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
            arrayList.clear();
            for (DataSnapshot ds: dataSnapshot.getChildren()) {
                int numLike = ds.child("numLikes").getValue(Integer.class);
                arrayList.add(numLike); 
                int i = 10;
                if(numLike >= i){
                    init(); //Function to place a posts
                }
            }
        }

        @Override
        public void onCancelled(@NonNull DatabaseError databaseError) {

        }
    });

init（）

private void init() {
    mPostRecyclerView = (RecyclerView) mRootVIew.findViewById(R.id.recyclerview_post2);
    mPostRecyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
    setupAdapter();
    mPostRecyclerView.setAdapter(mPostAdapter);

    //reverse
    LinearLayoutManager mLayoutManager = new LinearLayoutManager(getContext());
     mLayoutManager.setReverseLayout(true);
    mLayoutManager.setStackFromEnd(true);
    mPostRecyclerView.setLayoutManager(mLayoutManager);
}

setupAdapter（）

private void setupAdapter() {
    mPostAdapter = new FirebaseRecyclerAdapter<Post, HomeFragment.PostHolder>(
            Post.class,
            R.layout.row_post,
            HomeFragment.PostHolder.class,
            FirebaseUtils.getPostRef()
    )  {
        @Override
        public void populateViewHolder(HomeFragment.PostHolder viewHolder, final Post model, int position) {
            viewHolder.setNumCOmments(String.valueOf(model.getNumComments()));
            viewHolder.setNumLikes(String.valueOf(model.getNumLikes()));
            viewHolder.setTIme(DateUtils.getRelativeTimeSpanString(model.getTimeCreated()));
            viewHolder.setUsername(model.getUser().getUser());
            viewHolder.setPostText(model.getPostText());


            Glide.with(getActivity())
                    .load(model.getUser().getPhotoUrl())
                    .into(viewHolder.postOwnerDisplayImageView);

            if (model.getPostImageUrl() != null) {
                viewHolder.postDisplayImageVIew.setVisibility(View.VISIBLE);
                StorageReference storageReference = FirebaseStorage.getInstance()
                        .getReference(model.getPostImageUrl());
                Glide.with(getActivity())
                        .using(new FirebaseImageLoader())
                        .load(storageReference)
                        .into(viewHolder.postDisplayImageVIew);
            } else {
                viewHolder.postDisplayImageVIew.setImageBitmap(null);
                viewHolder.postDisplayImageVIew.setVisibility(View.GONE);
            }
            viewHolder.postLikeLayout.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    onLikeClick(model.getPostId());
                }
            });

            viewHolder.postCommentLayout.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Intent intent = new Intent(getContext(), PostActivity.class);
                    intent.putExtra(Constants.EXTRA_POST, model);
                    startActivity(intent);
                }
            });
        }
    };


}

我要复制应用程序“ 9GAG” ..

如何按FirebaseDatabase的值对帖子进行分类

0 个答案: