当前用户字符串

Question

我在显示数据时遇到了问题。在我使用当前用户 UID 作为密钥之前，但现在我使用自定义密钥，我不知道如何在我的代码中将此密钥作为字符串调用。

我的代码这部分 ( 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");

发生了什么变化

我想让用户输入一个字符串“dan ned”。

编辑：

 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) {

            }
        });

Answer 1

无需附加三个侦听器即可读取这三个值。您只能使用一个，如以下代码行所示：

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 "DanilNed@gmail.com"
            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!
        }
    }
});

当前用户字符串

Current user to string

java

android

firebase

google-cloud-platform

firebase-realtime-database