android - 在 key firebase 中获取 key

Question

我的 firebase 数据库中以以下格式存储了客户数据。

{
  "fEYfwd8p9oSGAF6iUtXDLkMBCqc2" : { //user id
    "-KdLAGG-8VOMd62Noyc8" : { //customer id
      "customerCode" : "shi",
      "customerLimit" : "2569",
      "customerName" : "Shishir"
    },
    "-KdOraGISFJ6epjWucfh" : { //customer id
      //other cust details
    }
  },
  "jxW41BgSNWdRPyWtUkZA2G0eLhf2" : { //user id
    "-KdCgJKh6_Rb8MOi-fIj" : {
      "customerCode" : "Kau",
      "customerLimit" : "800",
      "customerName" : "Kaushik"
    },
    "-KdCgacTYBkThnVWe4sb" : {
      //other cust details
    },
    "-KdCggxld52mq0DsGRjH" : {
      //other cust details
    },
    "-KdChbdoV7nxwZoGLWsY" : {
      //other cust details
    }
  }
}

在我的 android 应用程序中，我试图在为客户创建其他详细信息之前检查客户代码是否存在，下面是我的做法。

DatabaseReference dbRef=FirebaseDatabase.getInstance().getReference("customers")
                       .child(FirebaseAuth.getInstance().getCurrentUser().getUid());
dbRef.orderByChild("customerCode").equalTo(code).addListenerForSingleValueEvent(new ValueEventListener() {
       @Override
       public void onDataChange(DataSnapshot snapshot) {
           if (!snapshot.exists()) {
               editTextAC.setText("");
               editTextAC.setError("Customer code not found in database.");
           } else {
               //need to get customer id here.
           }
       }
       @Override
       public void onCancelled(DatabaseError dbError) {
            Toast.makeText(activity, dbError.getMessage(), Toast.LENGTH_SHORT).show();
       }
});

我正在获取以下格式的快照数据。

{
    key = jxW41BgSNWasdsaRPsdyaWtUkZA2G0eLhf2,
    value = {-KdChbdoV7nfdasxwZoGLWsY = {
                customerCode = Ses,
                customerLimit = 78888,
                customerName = Sheshu
            }
    }
}

我需要从上面的 value 中获取客户 ID。我尝试执行 snapshot.getKey() 检索第一级 key 即 jxW41BgSNWasdsaRPsdyaWtUkZA2G0eLhf2 当我说 snapshot.getValue() 将检索 value 作为字符串。我如何从上面获取客户 ID？

Answer 1

for (DataSnapshot child : snapshot.getChildren()) {
    Log.i("TAG", "child key = " + child.getKey());
}