Java Code Sample to Access Firebase Data

This article represents Java code sample which can be used to access Firebase database. Please feel free to comment/suggest if I missed to mention one or more important points. Also, sorry for the typos.
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
    }
});

 

Ajitesh Kumar
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Ajitesh Kumar

I have been recently working in the area of Data Science and Machine Learning / Deep Learning. In addition, I am also passionate about various different technologies including programming languages such as Java/JEE, Javascript, Python, R, Julia etc and technologies such as Blockchain, mobile computing, cloud-native technologies, application security, cloud computing platforms, big data etc. I would love to connect with you on Linkedin.
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