Saving Data on Android

build.gradle
 file as 
applicationId
. Enter 
com.raywenderlich.whatsup
 as the 
package name.
App nickname is optional so you won't add it.
The second thing that you need to provide is the 
SHA1
 hash of your debug key. This 
is only required if you'll use specific Firebase features. In this project, it's needed for 
the 
Authentication
 feature. You can get your SHA1 hash in two ways, by using 
Android Studio, and Gradle, or by typing in a terminal command.
Saving Data on Android
Chapter 12: Introduction to Firebase Realtime Database
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For the first option, open up the 
Gradle
 tab from the right-hand side toolbar, and 
locate the following task:
Saving Data on Android
Chapter 12: Introduction to Firebase Realtime Database
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Run it, and you should see the output in the terminal. The alternative is running the 
following command:
keytool -list -v -keystore ~/.android/debug.keystore -alias 
androiddebugkey -storepass android -keypass android
In the Android Studio's