Unable to read data from firebase in android

Question

I am working on android app where Firebase is being used for maintaining mobile back end. I have database in this format on Firebase

{
         


        

Answer 1

Are you mapping the dataSnapshot to the correct java class?.

Because I see you have named your file as Users.java and when you getValue, you create object for User.

            User user = dataSnapshot.getValue(User.class);

Instead should it be

Users user = dataSnapshot.getValue(Users.class);

Just curious whether you have named it right.

And also use a Map instead of a List for the Users and it will work for sure.

`

Answer 2

In order to display the data, you need change your code like this:

mDatabase.child("users").child(userId).addValueEventListener(new ValueEventListener() { 
    @Override 
    public void onDataChange(DataSnapshot dataSnapshot) { 
        String firstName = dataSnapshot.child("firstName").getValue(String.class); 
        Log.d("Scheduled", firstName); 
    } 

    @Override 
    public void onCancelled(DatabaseError error) { 
    // Failed to read value 
    } 
});   

In which userId is the unique id generated by the push() method.