I would like to make the user data be sent to the Firestore database upon registration. I have already made the registration mechanism, but I don't know how to send this data to the database. I couldn't find the exact answer or code anywhere on how to do it, unfortunately :(

my RegisterActivity:

    class RegisterActivity : AppCompatActivity() {
    
        private val mailAuth = FirebaseAuth.getInstance()
    
        override fun onCreate(savedInstanceState: Bundle?) {
            super.onCreate(savedInstanceState)
            setContentView(R.layout.activity_register)
    
            findViewById<TextView>(R.id.tv_login).setOnClickListener {
    
                startActivity(Intent(this@RegisterActivity, LoginActivity::class.java))
                finish()
            }
    
                    findViewById<TextView>(R.id.tv_login).setOnClickListener {

            startActivity(Intent(this@RegisterActivity, LoginActivity::class.java))
            finish()
        }

        findViewById<Button>(R.id.btn_register).setOnClickListener {
            when {
                TextUtils.isEmpty(findViewById<EditText>(R.id.et_register_email).text.toString().trim { it <= ' ' }) -> {
                    Toast.makeText(
                        this@RegisterActivity,
                        "Please enter email.",
                        Toast.LENGTH_SHORT
                    ).show()
                }

                TextUtils.isEmpty(findViewById<EditText>(R.id.et_register_password).text.toString().trim { it <= ' ' }) -> {
                    Toast.makeText(
                        this@RegisterActivity,
                        "Please enter password.",
                        Toast.LENGTH_SHORT
                    ).show()
                }
                else -> {

                    val email: String = findViewById<EditText>(R.id.et_register_email).text.toString().trim { it <= ' ' }
                    val password: String = findViewById<EditText>(R.id.et_register_password).text.toString().trim { it <= ' ' }

                    FirebaseAuth.getInstance().createUserWithEmailAndPassword(email, password)
                        .addOnCompleteListener(


                            OnCompleteListener<AuthResult> { task ->

                                if (task.isSuccessful) {


                                    val rootRef = FirebaseFirestore.getInstance()
                                    val usersRef = rootRef.collection("users")
                                    val auth = FirebaseAuth.getInstance()
                                    auth.currentUser?.apply {
                                        usersRef.document(uid).set(mapOf(
                                            "uid" to uid,
                                            "email" to email
                                        )).addOnCompleteListener{ task ->
                                            if (task.isSuccessful) {
                                                Log.d("TAG", "User successfully added.")
                                            } else {
                                                Log.d("TAG", task.exception!!.message!!)
                                            }
                                        }
                                    }


                                    val firebaseUser: FirebaseUser = task.result!!.user!!


                                    Log.d(
                                        "RegisterActivity", "register-in"
                                    )
                                    val intent = Intent(this@RegisterActivity, NavigationActivity::class.java)
                                    intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK
                                    intent.putExtra("user_id", firebaseUser.uid)
                                    intent.putExtra("email_id", email)
                                    startActivity(intent)
                                    finish()
                                } else {
                                    Toast.makeText(
                                        this@RegisterActivity,
                                        task.exception!!.message.toString(),
                                        Toast.LENGTH_SHORT
                                    ).show()
                                }
                            }
                        )
                }
            }
        }
    }

    override fun onStart() {
        super.onStart()
        isCurrentUser()
    }
    private fun isCurrentUser() {
        mailAuth.currentUser?.let {
            val intent = Intent(applicationContext, NavigationActivity::class.java).apply {
                flags = (Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK)
            }
            startActivity(intent)
        }

    }
}

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CodePudding user response：

In order to be able to write user data to Firestore, you have to be sure that the user is authenticated. So please add the following lines of code:

val rootRef = FirebaseFirestore.getInstance()
val usersRef = rootRef.collection("users")
val auth = FirebaseAuth.getInstance()
auth.currentUser?.apply {
    usersRef.document(uid).set(mapOf(
        "uid" to uid,
        "email" to email
    )).addOnCompleteListener{ task ->
        if (task.isSuccessful) {
            Log.d("TAG", "User successfully added.")
        } else {
            Log.d("TAG", task.exception!!.message!!)
        }
    }
}

Right inside:

if (task.isSuccessful) {
    ...
}

The result in the logcat will be:

Firestore-root
  |
  --- users (collection)
       |
       --- $uid (document)
            |
            --- uid: "The uid that comes from the authentication process"
            |
            --- email: "The email address used to authenticate"