I faced a problem with showing data. Before I used current users UID as a key but now I'm using the custom key and I don't know how to call this key as a string in my code.

My code this part ( child(user.getUid() )

FirebaseUser userUID;
userUID = FirebaseAuth.getInstance().getCurrentUser();

        final DatabaseReference NameRef = database.getReference().child("No server").child(userUID.getUid()).child("name");
        final DatabaseReference LastNameRef = database.getReference().child("No server").child(userUID.getUid()).child("lastName");
        final DatabaseReference EmailRef = database.getReference().child("No server").child(userUID.getUid()).child("email");

What changed

I want make user a string "dan ned".

Edit:

 FirebaseDatabase database = FirebaseDatabase.getInstance();

        final DatabaseReference NameRef = database.getReference().child("No server").child(user.getUid()).child("name");
        final DatabaseReference LastNameRef = database.getReference().child("No server").child(user.getUid()).child("lastName");
        final DatabaseReference EmailRef = database.getReference().child("No server").child(user.getUid()).child("email");

      NameRef.addValueEventListener(new ValueEventListener() {
          @Override
          public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
              if (dataSnapshot.exists()){
                  final String strName = dataSnapshot.getValue(String.class);
                  textName.setText(strName);
              }
          }

          @Override
          public void onCancelled(@NonNull DatabaseError error) {

          }
      });

        LastNameRef.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                if (dataSnapshot.exists()){
                    final String strLastName = dataSnapshot.getValue(String.class);
                    textLastName.setText(strLastName);
                }
            }

            @Override
            public void onCancelled(@NonNull DatabaseError error) {

            }
        });

        EmailRef.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                if (dataSnapshot.exists()){
                    final String strEmail = dataSnapshot.getValue(String.class);
                    textEmail.setText(strEmail);
                }
            }

            @Override
            public void onCancelled(@NonNull DatabaseError error) {

            }
        });

CodePudding user response：

There is no need to attach three listeners in order to read those three values. You can use only one, as you can see in the following lines of code:

String name = FirebaseAuth.getInstance().getCurrentUser().getDisplayName();
DatabaseReference db = FirebaseDatabase.getInstance().getReference();
DatabaseReference nameRef = db.child("No server").child(name);
nameRef.get().addOnCompleteListener(new OnCompleteListener<DataSnapshot>() {
    @Override
    public void onComplete(@NonNull Task<DataSnapshot> task) {
        if (task.isSuccessful()) {
            DataSnapshot snapshot = task.getResult();
            String key = snapshot.getKey();
            Log.d("TAG", key); //It will print "dan ned"
            String email = snapshot.child("email").getValue(String.class);
            Log.d("TAG", email); //It will print "[email protected]"
            String lastName = snapshot.child("lastName").getValue(String.class);
            Log.d("TAG", lastName); //It will print "Ned"
            String name = snapshot.child("name").getValue(String.class);
            Log.d("TAG", name); //It will print "Dan"
        } else {
            Log.d("TAG", task.getException().getMessage()); //Never ignore potential errors!
        }
    }
});