问题
I have the following code that should return the user data logged in by Firebase, it returns the user with no problem, ID and Email, but the value of the name returns empty or null. As if the user had been registered without a name, but in the register the name of the user appears. Does anyone know why? I already searched it and it looks like it has some bug with the Firebase getDisplayName. Does anyone have a solution?
public static FirebaseUser getUsuarioAtual() {
FirebaseAuth usuario = ConfiguracaoFirebase.getFirebaseAutenticacao();
return usuario.getCurrentUser();
}
public static Usuario getDadosUsuarioLogado() {
FirebaseUser firebaseUser = getUsuarioAtual();
Usuario usuario = new Usuario();
usuario.setId(firebaseUser.getUid());
usuario.setEmail(firebaseUser.getEmail());
usuario.setNome(firebaseUser.getDisplayName());
return usuario;
}
Returns the instance of FirebaseAuth:
public static FirebaseAuth getFirebaseAutenticacao(){
if (auth == null) {
auth = FirebaseAuth.getInstance();
}
return auth;
}
Code that creates an account:
public void cadastrarUsuario(final Usuario usuario){
autenticacao = ConfiguracaoFirebase.getFirebaseAutenticacao();
autenticacao.createUserWithEmailAndPassword(
usuario.getEmail(),
usuario.getSenha()
).addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
if (task.isSuccessful()){
try {
String idUsuario = task.getResult().getUser().getUid();
usuario.setId( idUsuario );
usuario.salvar();
UsuarioFirebase.atualizarNomeUsuario(usuario.getNome());
//Redireciona o usuário com base no seu tipo
if ( verificaTipoUsuario() == "P" ) {
startActivity(new Intent(CadastroActivity.this, PassageiroActivity.class));
finish();
Toast.makeText(CadastroActivity.this, "Cadastro realizado com sucesso!", Toast.LENGTH_SHORT).show();
} else {
startActivity(new Intent(CadastroActivity.this, RequisicoesActivity.class));
finish();
Toast.makeText(CadastroActivity.this, "Parabéns! Você agora é nosso parceiro!", Toast.LENGTH_SHORT).show();
}
} catch (Exception e) {
e.printStackTrace();
}
} else {
String excecao = "";
try {
throw task.getException();
} catch ( FirebaseAuthWeakPasswordException e ) {
excecao = "Digite uma senha mais forte!";
} catch ( FirebaseAuthInvalidCredentialsException e ) {
excecao = "Por favor, digite um e-mail válido";
} catch ( FirebaseAuthUserCollisionException e ) {
excecao = "Já existe uma conta com esse e-mail";
} catch ( Exception e ) {
excecao = "Erro ao cadastrar usuário: " + e.getMessage();
e.printStackTrace();
}
Toast.makeText(CadastroActivity.this, excecao, Toast.LENGTH_SHORT).show();
}
}
});
}
Update User Name:
public static boolean atualizarNomeUsuario (String nome) {
try {
FirebaseUser user = getUsuarioAtual();
UserProfileChangeRequest profile = new UserProfileChangeRequest.Builder()
.setDisplayName( nome )
.build();
user.updateProfile(profile).addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
if (!task.isSuccessful()){
Log.d("Perfil", "Erro ao atualizar nome de perfil.");
}
}
});
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
回答1:
In order to get your display name , you will need to set it up when you create the new account with email and password
For example
mAuth.createUserWithEmailAndPassword(email,pass).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
if(task.isSuccessful()){
saveUser(email,pass,name);
FirebaseUser user = mAuth.getCurrentUser();
UserProfileChangeRequest profileUpdates = new UserProfileChangeRequest.Builder().setDisplayName(name).build();
user.updateProfile(profileUpdates);
finish();
...
Now, you will need an AuthStateListener, and then when it's complete (you successful logged in or created the account), you can get the name. Since firebase manages this Asynchronous
mAuthListener = new FirebaseAuth.AuthStateListener() {
@Override
public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
FirebaseUser user = firebaseAuth.getCurrentUser();
if (user != null) {
usuario.setNome(firebaseUser.getDisplayName());
} else {
finish();
...
Check UserProfileChangeRequest Here
Important
If you log in with a provider like Google sign-in, it will handle automatically your display name (as well as the profile photo), and just calling user.getDisplayName() without setting it will do the job correctly
Remember that when you create a new account with emailAndPassword, the ID of the account and the email are automatically stored at Firebase, that's why you can access those data without setting them. This is an example of the metadata that is created along with the user. In this case, the metadata defining your user is only the UserID and the Email.
But there is never set a displayName or a photoUri for that account, that's why you need to also set them up when you create a new account as I mentioned above.
Tip
Avoid doing your owns methods like this, you will be confused when the app scales.
public static FirebaseAuth getFirebaseAutenticacao(){
if (auth == null) {
auth = FirebaseAuth.getInstance();
}
return auth;
}
instead, just use this
FirebaseAuth usuario = FirebaseAuth.getInstance();
And then use your usuario to get what you need
usuario.getCurrentUser().getUid(); //for example, getting the uid of the user logged in
来源：https://stackoverflow.com/questions/53395256/firebase-getdisplayname-returns-empty