我的数组返回零。我必须使用多维数组，但我不知道如何使用它

Question

这是我在main中的代码，从firebase

中检索一组值

      var jsonToSend = JsonConvert.SerializeObject(json, Formatting.None);
  var multipart = new MultipartFormDataContent();
  var body = new StringContent(jsonToSend, Encoding.UTF8, "application/json");
  multipart.Add(body, "JsonDetails");
  multipart.Add(new ByteArrayContent(System.IO.File.ReadAllBytes("E:\\file.png")), "DocumentDetails", "file1.png");
  var httpClient = new HttpClient();
  httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);
  var response = httpClient.PostAsync(new Uri("uriToPost"), multipart).Result;

我必须检索arraylist天气中的所有值。图像显示了我的firebase，我必须遍历节点并获取子值：

Answer 1

我希望你定义模型类构造函数，并在代码下面获取数据：

    private DatabaseReference mDatabase;
private FirebaseDatabase mFirebaseInstance;
// put below two line in onCreate method.
mFirebaseInstance = FirebaseDatabase.getInstance();
    mDatabase = mFirebaseInstance.getReference("usersDb/UserTable");

mDatabase.addValueEventListener(new ValueEventListener() { // here pass your firebase database instance..
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            weather.clear();
            for (DataSnapshot postSnapshot: snapshot.getChildren()) {
                model model = postSnapshot.getValue(model.class);
                weather.add(model);

            }
        }


        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });