how can do signup form include fname last name etc on firebase using android studio

this code for signup form on firebase using an android studio and it's working fine but I need to add first name, last name, gender with the signup form, and record to a firebase user group and direct go to a specific group

This picture shows what I want and I do it manually.

package com.example.showapps;
import android.content.Intent;
import android.os.Bundle;
import android.util.Patterns;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
public class signupActivity extends AppCompatActivity implements View.OnClickListener {
EditText s_email, s_password, s_cpasserd , fname,lname,phone;
ProgressBar progressBar;
FirebaseAuth firebaseAuth;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_signup);
s_email = findViewById(R.id.s_email);
s_password = findViewById(R.id.s_password);
s_cpasserd = findViewById(R.id.s_cpassword);
lname= findViewById(R.id.s_lname);
fname = findViewById(R.id.s_fname);
phone= findViewById(R.id.s_phone);
firebaseAuth = FirebaseAuth.getInstance();
progressBar = findViewById(R.id.progressBar2);
findViewById(R.id.btn_signup).setOnClickListener(this);
findViewById(R.id.mTologin).setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn_signup:
signup();
break;
case R.id.mTologin:
startActivity(new Intent(getApplicationContext(), login_Activity.class));
break;
}
}
private void signup() {
String email = s_email.getText().toString().trim();
String password = s_password.getText().toString().trim();
String cpassword = s_cpasserd.getText().toString().trim();
String fname= s_fname.getText().toString().trim();
String lname = s_lname.getText().toString().trim();
String phone = s_phone.getText().toString().trim();
if (email.isEmpty()) {
s_email.setError("The Email is required");
s_email.requestFocus();
return;
}
if (Patterns.EMAIL_ADDRESS.matcher(email).matches()) {
Toast.makeText(getApplicationContext(), "The Email is regietered", 
Toast.LENGTH_SHORT).show();
}
if (password.length() < 6) {
s_password.setError("The password is less than 6 characters");
s_password.requestFocus();
return;
}
if (password.isEmpty()) {
s_password.setError("The password is required");
s_password.requestFocus();
return;
}
if (cpassword.isEmpty()) {
s_password.setError("The comfirm password is required");
s_password.requestFocus();
return;
}
if(!cpassword.equals(password)){
s_cpasserd.setError("The password is not much! ");
s_cpasserd.requestFocus();
return;
}
progressBar.setVisibility(View.VISIBLE);
firebaseAuth.createUserWithEmailAndPassword(email, password).addOnCompleteListener(new 
OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
progressBar.setVisibility(View.GONE);
if (!task.isSuccessful()) {
Toast.makeText(getApplicationContext(), "Error ! ", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(getApplicationContext(), "The user has been registered ", 
Toast.LENGTH_SHORT).show();
startActivity(new Intent(getApplicationContext(), login_Activity.class));
}
}
});
}
}

here what i need to add for this code to complete my task ?

firebaseAuth.createUserWithEmailAndPassword(email, password).addOnCompleteListener(new 
OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
progressBar.setVisibility(View.GONE);
if (!task.isSuccessful()) {
Toast.makeText(getApplicationContext(), "Error ! ", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(getApplicationContext(), "The user has been registered ", 
Toast.LENGTH_SHORT).show();
startActivity(new Intent(getApplicationContext(), login_Activity.class));
}
}
});

Thanks

Inside the else statement, you need to send the data to firestore:

 } else {
Map<String, Object> userInfo = new HashMap<>();
city.put("name", "name_here");
city.put("gender", "gender_here");
city.put("email", email);
FirebaseFirestore db = FirebaseFirestore.getInstance();
db.collection("customer _user").document("1")
.set(userInfo)
.addOnSuccessListener(new OnSuccessListener<Void>() {
@Override
public void onSuccess(Void aVoid) {
Log.d(TAG, "DocumentSnapshot successfully written!");
Toast.makeText(getApplicationContext(), "The user has been registered ", 
Toast.LENGTH_SHORT).show();
startActivity(new Intent(getApplicationContext(), login_Activity.class));
}
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
Log.w(TAG, "Error writing document", e);
}
});
}

Create a hashmap then using set you can add the data to the document and navigate to the other activity in case it was successful.