检查一组URL，如果它包含特定的表ID(check a set of URLs if it contains a particular table ID)

 看起来您的数据结构正在映射到数组，而不是映射。 我对此感到有些惊讶，因为你的第一个索引是1（不是0）。 但错误信息非常清楚它正在尝试做什么。 
 
 因此，要解决此问题，请将房间映射到List或数组： 
 
private List<FirebaseRoomReference> rooms;
 
 为防止此类问题， 强烈建议不要使用数字索引。 使用push()生成的值或使用固定字符串为数字添加前缀，这样就不会混淆它的类型： room_1 ， room_2等。 
 
 更新 
 
 我可以用这个读取你更新的JSON： 
 
public static class FirebaseRoomReference {
    private String id;
    private String name;
    private String ownerName;

    public String getId() { return id; }
    public String getName() { return name; }
    public String getOwnerName() { return ownerName; }
}

public static class FirebaseSchool {
    private String id;
    private String name;
    private String address;
    private String city;
    //private List<FirebaseUserReference> admins;
    private Map<String, FirebaseRoomReference> rooms;

    //public List<FirebaseUserReference> getAdmins() { return admins; }

    public Map<String, FirebaseRoomReference> getRooms() {
        return rooms;
    }

    public String getId() { return id; }
    public String getName() { return name; }
    public String getAddress() { return address; }
    public String getCity() { return city; }
}

public static void main(String[] args) throws Exception {
    Firebase ref = new Firebase("https://stackoverflow.firebaseio.com/35109413");
    ref.child("schools").addChildEventListener(new ChildEventListener() {
        @Override
        public void onChildAdded(DataSnapshot snapshot, String s) {
            System.out.println(snapshot.getValue(FirebaseSchool.class));
        }
    });
 
 我改变的事情： 
 
 
 
 我将POJO类标记为静态，因为我将它们作为内部类包含在我的测试程序中。 
 
 
 我删除了用户管理员，因为它们不在您的JSON中 
 
 
 我将List更改为Map，因为您现在使用的是字符串键 
 
 
 在我更改最后一点之前，我收到了您所做的相同错误消息。 

It looks like your data structure is being mapped to an array, not a map. I'm somewhat surprised about that, since your first index is 1 (not 0). But the error message is pretty explicit about what it's trying to do.
 
So to solve the problem, map the rooms to an List or array:
 
private List<FirebaseRoomReference> rooms;
 
To prevent this type of problem it is highly recommended to not use numeric indexes. Either use the values generated by push() or prefix your numbers with a fixed string, so that there's never any confusion about what type it is: room_1, room_2, etc.
 
Update
 
I can read your updated JSON with this:
 
public static class FirebaseRoomReference {
    private String id;
    private String name;
    private String ownerName;

    public String getId() { return id; }
    public String getName() { return name; }
    public String getOwnerName() { return ownerName; }
}

public static class FirebaseSchool {
    private String id;
    private String name;
    private String address;
    private String city;
    //private List<FirebaseUserReference> admins;
    private Map<String, FirebaseRoomReference> rooms;

    //public List<FirebaseUserReference> getAdmins() { return admins; }

    public Map<String, FirebaseRoomReference> getRooms() {
        return rooms;
    }

    public String getId() { return id; }
    public String getName() { return name; }
    public String getAddress() { return address; }
    public String getCity() { return city; }
}

public static void main(String[] args) throws Exception {
    Firebase ref = new Firebase("https://stackoverflow.firebaseio.com/35109413");
    ref.child("schools").addChildEventListener(new ChildEventListener() {
        @Override
        public void onChildAdded(DataSnapshot snapshot, String s) {
            System.out.println(snapshot.getValue(FirebaseSchool.class));
        }
    });
 
Things I changed:
 
 
 
I marked the POJO classes as static, since I include them as inner classes in my test program.
 
 
I removed the user admins, since they're not present in your JSON
 
 
I changed your List to a Map, since you're now using string keys
 
 
Before I change that last point, I got the same error message you did.