FireBase - Khởi tạo

+ file json firebase : 





+ 


+ build gradle (app) :
compile 'com.google.firebase:firebase-database:9.6.1'
// dòng này để cuối cùng
apply plugin: 'com.google.gms.google-services' 


+ Build project : 
classpath 'com.google.gms:google-services:3.0.0'




+ main.java : 

FirebaseDatabase Database ;
DatabaseReference Goc ;



// viet code
Database = FirebaseDatabase.getInstance();
Goc = Database.getReference("message"); // nut goc