Recover user name and email in Navigationdrawer?

Question

How do I recover the name and email of the logged-in user? I’m using Firebase BD.

    public class MenuActivity extends AppCompatActivity
    implements NavigationView.OnNavigationItemSelectedListener {

private Toolbar toolbar;
private TextView nomePefil, emailPerfil;
private FirebaseAuth autenticacao;
private DatabaseReference firebase;



@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_menu);
    toolbar = findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);


    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
            this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
    drawer.addDrawerListener(toggle);
    toggle.syncState();

    NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
    navigationView.setNavigationItemSelectedListener(this);

    //Recuperar Nome e E-mail para o Menu

    nomePefil = findViewById(R.id.tv_nomePerfil);
    emailPerfil = findViewById(R.id.tv_emailPerfil);

    autenticacao = FirebaseAuth.getInstance();
    String email = autenticacao.getCurrentUser().getEmail();

    //>>>>>>>> erro aqui <<<<<<<<<<
    emailPerfil.setText(email);

    firebase = FirebaseDatabase.getInstance().getReference();
    firebase.child("usuarios").orderByChild("email").equalTo(email).addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            for (DataSnapshot postSnapShot : dataSnapshot.getChildren()){
                String nome = postSnapShot.child("nome").getValue().toString();
                nomePefil.setText(nome);
            }

        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });

}

Answer 1

If you’re using the Navigationdrawer the template already provides:

NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);

navigationView.setNavigationItemSelectedListener(this);

    View headerView = navigationView.getHeaderView(0);

    // Obtém a referência dos TextViews a partir do NavigationView 
    TextView text1 = (TextView) headerView.findViewById(R.id.text1);
    TextView text2 = (TextView) headerView.findViewById(R.id.text2);

    text1.setText("meu_texto");
    text2.setText("meu_texto");

To recover from firebase do:

private FirebaseAuth autenticacao;
autenticacao = FirebaseAuth.getInstance();
String email = autenticacao.getCurrentUser().getEmail();

For the name, it must be saved in some node, to recover the values you do so:

private DatabaseReference referenciaFirebase;
 referenciaFirebase = FirebaseDatabase.getInstance().getReference();

//Em "usuarios" eu ordeno tudo pelo email onde o email for igual ao meu email, então aí eu tenho todo o meu nó a disposição para recuperar os dados
referenciaFirebase.child("usuarios").orderByChild("email").equalTo(email).addValueEventListener(new ValueEventListener() {
                @Override
                public void onDataChange(DataSnapshot dataSnapshot) {
                    for(DataSnapshot postSnapshot : dataSnapshot.getChildren()) {
                        String nome = postSnapshot.child("nome").getValue().toString();


                    }
                }

                @Override
                public void onCancelled(DatabaseError databaseError) {

                }
            });

"Users" is the name of the main node, you put yours, from it I order the list where the email is equal to my email I already took, so inside the for I can recover any node value within that user.

REMEMBERING - you must have saved in your node the user’s email, otherwise this query will not work, if you have not saved, use something that only that user has to be able to recover only it inside the for

In the example I did look like db: