Firebase - realtime database set additional value to user throws exception

问题

I have class User which has additional info, but it is throwing:

com.google.firebase.database.DatabaseException: Serializing Collections is not supported, please use Lists instead

My code is:

User user = new User(Gender.valueOf(mGenderSpinner.getSelectedItem().toString()));
                            Log.d("GENDER", user.getGender().toString());
                            mFirebaseDatabase.getReference("Users")
                                    .child(mAuth.getCurrentUser().getUid())
                                    .setValue(user)

The question is how I can still set User.class value or this is not possible?

回答1:

Value type ordering

• Null values
• Boolean values
• Integer and floating-point values, sorted in numerical order
• Date values
• Text string values
• Byte values
• Cloud Firestore references
• Geographical point values
• Array values
• Map values

com.google.firebase.database.DatabaseException: Serializing Collections is not supported, please use Lists instead

• Above Exception show that you have unsupported Collections object on User class just change with one of above supported type ex. List<Type>.

Update

Thanks to Alex Mano comment,

• Above is Data Types is for Firebase Cloud Database, But Firebase Realtime Database as following.

• Pass types that correspond to the available JSON types as follows:

  • String
  • Long
  • Double
  • Boolean
  • Map
  • List

来源：https://stackoverflow.com/questions/51813160/firebase-realtime-database-set-additional-value-to-user-throws-exception