java - 如何显示按最喜欢的评论过滤的回收者 View 项目？

Question

我想创建一个小型社交应用程序。我快完成了，但我不知道如何根据最喜欢的评论项在 RecyclerView 中显示评论项。

这是代码

 //This is commentAdapter
 public void onBindViewHolder(@NonNull final Myholder myHolder, final int i) {
    final ModelComments modelComments = commentsList.get(i);
    String cLikes = commentsList.get(i).getcLikes(); //this is for like

myHolder.user_comment.setText(modelComments.getComment());
    myHolder.clickBtn.setText(cLikes);//to show how many likes the user get



//This is commentsActivity
 RecyclerView recyclerView;
FirebaseAuth firebaseAuth;
FirebaseUser user;
private CommentAdapter commentAdapter;
private List<ModelComments> commentsList;

recyclerView = findViewById(R.id.comment_recycler);
LinearLayoutManager layoutManager = new LinearLayoutManager(this);
    //show newest comment first and then old
    layoutManager.setStackFromEnd(true);
    layoutManager.setReverseLayout(true);
    recyclerView.setLayoutManager(layoutManager);
    commentsList = new ArrayList<>();
    commentAdapter= new CommentAdapter(this, commentsList);
    recyclerView.setAdapter(commentAdapter);

showAllComment();
}

private void showAllComment() {
 try {
        DatabaseReference reference = FirebaseDatabase.getInstance().getReference("comments");
        reference.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                commentsList.clear();
                for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
                    ModelComments modelComments = snapshot.getValue(ModelComments.class);
                    commentsList.add(modelComments);
                }

                commentAdapter.notifyDataSetChanged();
            }

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

            }
        });
    } catch (Exception e) {
        e.printStackTrace();
    }
}

再说一遍，有什么办法可以实现这一点吗？如果您不明白，请评论此问题。

Answer 1

正如我们所看到的，您已经通过执行以下操作完成了绑定(bind)

commentsList.clear();
for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
    ModelComments modelComments = snapshot.getValue(ModelComments.class);
    commentsList.add(modelComments);
}
commentAdapter.notifyDataSetChanged();

首先，您清除了列表，然后添加了注释，最后调用了notifyDataSetChanged。您错过的是在通知数据更改之前对列表进行排序

请检查此链接以了解如何对列表进行排序。 Sort ArrayList of custom Objects by property