[Firebase] 이메일/비밀번호 로그인

Android에서 비밀번호 기반 계정으로 Firebase에 인증  |  Firebase Documentation

 

1. 예제 코드

---

package com.example.fb_email_pw_auth

import android.content.ContentValues.TAG
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import android.widget.Button
import android.widget.EditText
import android.widget.Toast
import com.google.firebase.auth.FirebaseAuth
import com.google.firebase.auth.ktx.auth
import com.google.firebase.ktx.Firebase

class MainActivity : AppCompatActivity() {

    private lateinit var auth: FirebaseAuth

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)


        // ...
        // Initialize Firebase Auth
        auth = Firebase.auth

        //회원가입
        val joinBtn = findViewById<Button>(R.id.joinBtn)
        joinBtn.setOnClickListener {
            val email = findViewById<EditText>(R.id.emailArea)
            val password = findViewById<EditText>(R.id.passwordArea)

            Log.d("MAIN", email.text.toString())
            Log.d("MAIN", password.text.toString())

            //이메일,비번 로그인
            auth.createUserWithEmailAndPassword(email.text.toString(), password.text.toString())
                .addOnCompleteListener(this) { task ->
                    if (task.isSuccessful) {
                        // Sign in success, update UI with the signed-in user's information
                        Toast.makeText(this, "회원가입/로그인 성공", Toast.LENGTH_LONG).show()
                    } else {
                        // If sign in fails, display a message to the user.
                        Toast.makeText(this, "회원가입 실패", Toast.LENGTH_LONG).show()

                    }
                }
        }

        //로그인
        val loginBtn = findViewById<Button>(R.id.loginBtn)
        loginBtn.setOnClickListener {

            val email = findViewById<EditText>(R.id.emailArea)
            val password = findViewById<EditText>(R.id.passwordArea)

            auth.signInWithEmailAndPassword(email.text.toString(), password.text.toString())
                .addOnCompleteListener(this) { task ->
                    if (task.isSuccessful) {
                        // Sign in success, update UI with the signed-in user's information
                        Toast.makeText(this, "로그인 성공", Toast.LENGTH_LONG).show()
                    } else {
                        // If sign in fails, display a message to the user.
                        Toast.makeText(this, "로그인인 실패", Toast.LENGTH_LONG).show()
                    }
                }
        }

        //로그아웃
        val logoutBtn = findViewById<Button>(R.id.logoutBtn)
        logoutBtn.setOnClickListener {
            Firebase.auth.signOut()
            Toast.makeText(this, "로그아웃 완료", Toast.LENGTH_LONG).show()
        }


    }
}

 

2. layout

---

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:orientation="vertical">

    <EditText
        android:id="@+id/emailArea"
        android:hint="email"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

    <EditText
        android:id="@+id/passwordArea"
        android:hint="password"
        android:inputType="textPassword"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>


    <Button
        android:id="@+id/joinBtn"
        android:text="회원가입"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
    <Button
        android:id="@+id/loginBtn"
        android:text="로그인"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
    <Button
        android:id="@+id/logoutBtn"
        android:text="로그아웃"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

</LinearLayout>