I'm writing an android app, where I need to read some data from the firebase database. First I was doing it in the mainActivity.java class, but than it started looking messy. So, I made a new class, that would manage all the database related things. But for some reason I can't use the data I'm getting, outside of the ValueEventListener method.
Below you can see my code. I hope I was clear enough about my problem. I would be very grateful if somebody would like to help. Thanks!
public class UserManager {
public Long getUserScore() {
final Long[] score = new Long[1];
DatabaseReference databaseReferenceUser;
databaseReferenceUser = FirebaseDatabase.getInstance().getReference("users");
databaseReferenceUser.child(FirebaseAuth.getInstance().getCurrentUser().getUid()).addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (dataSnapshot.exists()) {
User user = dataSnapshot.getValue(User.class);
score[0] = user.getScore();
Log.w("Score: ", score[0].toString()); // output: value from the db- Works fine
}
Log.w("Score: ", score[0].toString()); // output: value from the db- Works fine
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
Log.w("Score: ", score[0].toString()); // output: NullPointerException
return score[0];
}}
