Question

我正在使用Recycler视图从firebase中检索所有用户，如下所示

@Override
    public void onViewCreated(final View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        databaseReference = FirebaseDatabase.getInstance().getReference().child("users");

        firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<AllUsers, AllUsersViewHolder>
                (AllUsers.class, R.layout.all_users_display_layout, AllUsersViewHolder.class, databaseReference) {
            @Override
            protected void populateViewHolder(AllUsersViewHolder viewHolder, AllUsers model, final int position) {
                viewHolder.setName(model.getName());

                viewHolder.view.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {

                        String visit_user_id = getRef(position).getKey();

                        Intent intent = new Intent(getActivity(), UserProfilesActivity.class);
                        intent.putExtra("visit_user_id", visit_user_id);
                        startActivity(intent);
                    }
                });
            }
        };
        all_user_list.setAdapter(firebaseRecyclerAdapter);
    }

    public static class AllUsersViewHolder extends RecyclerView.ViewHolder {

        View view;

        public AllUsersViewHolder(View itemView) {
            super(itemView);
            view = itemView;
        }

        public void setName(String name) {
            TextView all_user_name = (TextView) view.findViewById(R.id.all_user_name);
            all_user_name.setText(name);
        }
    }

我如何在没有当前用户的情况下检索用户因为我正在使用此列表添加朋友方案

和我的数据库结构如下

users
    key
      name:xxxx
    key
      name:yyyy

请帮我解决这些问题

Answer 1

这是一个清单：

databaseReference.orderByChild("id").equalTo(null).addChildEventListener(new ChildEventListener() {
                    @Override
                    public void onChildAdded(DataSnapshot dataSnapshot, String s) {        

                   String name=dataSnapshot.child("name").getValue().toString();

                    }

                    @Override
                    public void onChildChanged(DataSnapshot dataSnapshot, String s) {

                    }

                    @Override
                    public void onChildRemoved(DataSnapshot dataSnapshot) {

                    }

                    @Override
                    public void onChildMoved(DataSnapshot dataSnapshot, String s) {

                    }

                    @Override
                    public void onCancelled(DatabaseError databaseError) {

                    }
                });

使用ChildEventListener列表，它将遍历节点names内的users

所以你可以这样做：

users
key
  name:xxxx
  id:true
key
  name:yyyy

如何在不获取当前用户的情况下从firebase数据库中检索所有用户？

1 个答案: