How get value from dataSnapshot?

Question

When I debug this code, in databaseUser dataSnapshot has the values from User in database, but in the object user1, did not add, it\'s all null. And I don\'t un

Answer 1

I once faced that problem, and the solution was quite amazing.

You should add setters in your User class.

Try it, and you won't regret it.

Answer 2

When you execute a query against the Firebase Database, there will potentially be multiple results. By attaching a ValueListener you get those results in one snapshot, so the snapshot contains a list of those results. Even if there is only a single result, the snapshot will contain a list of one result.

Your code fails to take this "list of results" into account. It's easy to fix by looping over the DataSnapshot.getChildren():

databaseUser.orderByChild("userEmail").equalTo(user.getEmail()).addListenerForSingleValueEvent(new ValueEventListener() {
  @Override
  public void onDataChange(DataSnapshot dataSnapshot) {
     for (DataSnapshot userSnapshot: dataSnapshot.getChildren()) {
         User user1 = userSnapshot.getValue(User.class);