java - 如何从 Firestore 数据库检索特定数据？

Question

我正在尝试从 Firestore 数据库中查找用户的手机号码，该数据库在检查条件(该条件表示用户的公寓和街区编号是否与公寓和街区中的条目匹配而不是检索)后包含所有用户详细信息他的手机号码。

图为数据库截图。

Answer 1

如果我理解正确，请尝试这样的操作:

 FirebaseFirestore  fireStore = FirebaseFirestore.getInstance();
        final String[] requiredMobile = {""}; //this is up to how you want to use the mobile number acquired
        fireStore.collection("users").get().addOnSuccessListener(new OnSuccessListener<QuerySnapshot>() {
            @Override
            public void onSuccess(QuerySnapshot documentSnapshot) {
                for (DocumentSnapshot document: documentSnapshot.getDocuments()
                     ) {
                    if(document.getString("flat")== ("desired Flat") && document.getString("block") =="desired blockNumber"){
                        requiredMobile[0] = document.getString("mobile"); //do something with phone number
                    }

                }
            }
        });