firebase-database FirebaseRealtime database with Android Using setValue to save data

Example

ThesetValue() method overwrites data at the specified location, including any child nodes.

You can use this method to:

1. Pass types that correspond to the available JSON types as follows:

• String
• Long
• Double
• Boolean
• Map<String, Object>
• List

2. Pass a custom Java object, if the class that defines it has a default constructor that takes no arguments and has public getters for the properties to be assigned.

This is an example with a CustomObject.
First define the object.

@IgnoreExtraProperties
public class User {

    public String username;
    public String email;

    public User() {
        // Default constructor required for calls to DataSnapshot.getValue(User.class)
    }

    public User(String username, String email) {
        this.username = username;
        this.email = email;
    }

Then get the Database reference and set the value:

   User user = new User(name, email);
   DatabaseReference mDatabase mDatabase = FirebaseDatabase.getInstance().getReference();
   mDatabase.child("users").child(userId).setValue(user);