View FireBase data

Question

How do I display the data that signed up in Firebase in my application and make them persist in it, so they can be viewed even offline Would you like some practical examples ...

//Classe dos usuarios

public class Usuarios {

private String Nome;
private String Data;
private String Rg;
private String Cpf;
private String Endereco;
private String Doenca;
private String Profissao;

public Usuarios(String Nome, String Data, String Rg, String Cpf, String Endereco, String Doenca, String Profissao) {
    this.Nome = Nome;
    this.Data = Data;
    this.Rg = Rg;
    this.Cpf = Cpf;
    this.Endereco = Endereco;
    this.Doenca = Doenca;
    this.Profissao = Profissao;
}
public Usuarios() {

}

public String getNome() {
    return Nome;
}

public void setNome(String nome) {
    Nome = nome;
}

public String getData() {
    return Data;
}

public void setData(String data) {
    Data = data;
}

public String getRg() {
    return Rg;
}

public void setRg(String rg) {
    Rg = rg;
}

public String getCpf() {
    return Cpf;
}

public void setCpf(String cpf) {
    Cpf = cpf;
}

public String getEndereco() {
    return Endereco;
}

public void setEndereco(String endereco) {
    Endereco = endereco;
}

public String getDoenca() {
    return Doenca;
}

public void setDoenca(String doenca) {
    Doenca = doenca;
}

public String getProfissao() {
    return Profissao;
}

public void setProfissao(String profissao) {
    Profissao = profissao;
   }
}

//Class Main public class Main extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
}
private void writeNewUser(String userId,String Nome, String Data, String Rg, String Cpf, String Endereco, String Doenca, String Profissao) {
    FirebaseDatabase database = FirebaseDatabase.getInstance();
    DatabaseReference myRef = database.getReference();
    Usuarios user = new Usuarios(Nome, Data, Rg, Cpf, Endereco, Doenca, Profissao);

    myRef.child("users").child(userId).setValue(user);
    myRef.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            Usuarios user = dataSnapshot.getValue(Usuarios.class);

           String nome = Usuarios.class.getName();

        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });
}

//Classe cadastro public void cadastro(View view){ FirebaseDatabase database = FirebaseDatabase.getInstance(); DatabaseReference myRef = database.getReference(); myRef.child("Users").child(etRg.getText().toString()).child("UserName").setValue(etNome.getText().toString()); myRef.child("Users").child(etRg.getText().toString()).child("UserData").setValue(etData.getText().toString()); myRef.child("Users").child(etRg.getText().toString()).child("UserRg").setValue(etRg.getText().toString()); myRef.child("Users").child(etRg.getText().toString()).child("UserCpf").setValue(etCpf.getText().toString()); myRef.child("Users").child(etRg.getText().toString()).child("UserEndereco").setValue(etEndereco.getText().toString()); myRef.child("Users").child(etRg.getText().toString()).child("UserDoenca").setValue(etDoenca.getText().toString()); myRef.child("Users").child(etRg.getText().toString()).child("UserProfissao").setValue(etProfissao.getText().toString()); } public void mostrarDados(View view){ textViewInfo.setText("UserName"); }

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Answer 1

1st of All it is not best practice to save your data, witch way you doing this, make a Java POJO object to save data Into firebase, here is video Tutorial i make to save java Obj to Firebase , here is Example How you Writer java obj to firebase

step one make your java Class

@IgnoreExtraProperties
public class User {

    public String username;
    public String email;

    public User() {
        // Default constructor required for calls to DataSnapshot.getValue(User.class)
    }

    public User(String username, String email) {
        this.username = username;
        this.email = email;
    }

}

step 2

private void writeNewUser(String userId, String name, String email) {
    User user = new User(name, email);

    mDatabase.child("users").child(userId).setValue(user);
}

Then You need add ValueEventListener To read data

      myRef.addValueEventListener(new ValueEventListener() {
                    @Override
                    public void onDataChange(DataSnapshot dataSnapshot) {
                         User user = dataSnapshot.getValue(User.class);

String Name user.getName();

                    }

                    @Override
                    public void onCancelled(DatabaseError databaseError) {

                    }
                });

For more read The google Doc