Saving Data on Android

Rules
 tab, replace the rules with the above snippet and click 
Publish
:
Saving Data on Android
Chapter 12: Introduction to Firebase Realtime Database
raywenderlich.com
209

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Now, only authenticated users are allowed to read from and write to your database.
You can learn more about database rules in the documentation here: 
https://
firebase.google.com/docs/database/security/
.
Communica/on with the Real/me Database
You need a way to talk to the Realtime Database. The first thing you need is a 
connection. To get a connection you need to create a database reference first. Open 
RealtimeDatabaseManager
 class and add the 
databaseReference
 property:
private
 val databaseReference = 
FirebaseDatabase
.getInstance().reference
This gets you a reference to the root of the Firebase JSON tree. You'll learn more 
about data structure later in this chapter.
For connectivity testing purposes, add a method to the 
RealtimeDatabaseManager
 
that will write some dummy data to the database.
fun addDummyData() { 
    databaseReference.setValue(
"Saving data on Android"
) 
}
Next, open 
HomeActivity
 class and add the 
realtimeDatabaseManager
 property:
private
 val realtimeDatabaseManager by 
lazy
 
{ 
RealtimeDatabaseManager
() }
Call 
realtimeDatabaseManager.addDummyData()
 from the 
initialize()
 method.
Saving Data on Android
Chapter 12: Introduction to Firebase Realtime Database
raywenderlich.com
210

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Run the app and sign in with your Google account by clicking the