Java Code Sample to Access Firebase Data

Pre-requisite for Firebase Database Access

It is recommended to not allow anyone to access Firebase database without any kind of authentication. The minimum that could be done is enable “Anonymous Authentication” by logging in Firebase console.

Java Code Sample for Firebase Database Access

In the code below, note some of the following:

• Code for anonymous authentication
• Code for accessing a user object based on a given userId

Firebase firebase = new Firebase("https://dbname.firebaseio.com/");
firebase.authAnonymously(new Firebase.AuthResultHandler() {
    @Override
    public void onAuthenticated(AuthData authData) {
        // we've authenticated this session with your Firebase app
        firebase.child("users/" + userId).addListenerForSingleValueEvent(new ValueEventListener() {
         @Override
   public void onDataChange(DataSnapshot snapshot) {
    String emailAddress = (String)snapshot.child("emailAddress").getValue();
    String firstname = (String)snapshot.child("firstname").getValue();
   }

   @Override
   public void onCancelled(FirebaseError arg0) {
   }
     });
    }
    @Override
    public void onAuthenticationError(FirebaseError firebaseError) {
        // there was an error
    }
});