Saving Data on Android

Create 
database
 button. The security rules dialog will open:
Saving Data on Android
Chapter 12: Introduction to Firebase Realtime Database
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Select the second option, 
Start in test mode
, and click the 
Enable
 button. You'll 
learn more about security rules in a bit.
Once your database is created you'll get this:
To add the Realtime Database service to your app, you only need to add one more 
dependency.  Open up 
build.gradle
 file, if you haven't got it open and add the 
following dependency, making sure you're using the latest version:
implementation 'com.google.firebase:firebase-database:
16.1
.
0
'
Database rules
In this section, you'll be working on 
WhatsUp
 app which has an authentication 
feature so the app can know who your users are. 
Authentication
 is the process of 
verifying users are who they say they are, and to give them certain security access to 
your service.
User identity is an important security concept. Different users have different data 
and different capabilities. In this app, the user will be able to delete posts it created 
but not the other people's posts. Because of this, you need a way to control who has 
access to what data in your database. The process of determining who has access to 
what is called 
authorization
.
To implement the various aspects of security, authentication and authorization 
would require a lot of work. Firebase has the Authentication service which can use 
for all those sides of security, and the Realtime Database service uses internal