[Firebase] 이메일 회원가입&로그인

파이어베이스 이메일 로그인

AndroidStudio 3.0.1

Kotlin

1. Firebase선택하고 Authentication - Email and password authentication - Connect App to Firebase. 

번호대로 따라하면 다 자동으로 해준다. 

2. 코드

MainActivity.Kt

-로그인 로그아웃 처리는 콜백으로 하는게 아니라 auth리스너에서 처리한다.

package com.example.lipnus.firebaseauth

import android.content.Intent
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import android.widget.Toast
import com.example.lipnus.firebaseauth.R.id.*
import com.google.firebase.auth.FirebaseAuth
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {

    var authStateListener: FirebaseAuth.AuthStateListener? = null

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

        //로그인 세션을 체크하는 부분
        authStateListener = FirebaseAuth.AuthStateListener { firebaseAuth ->

            Log.e("LLPP", "로그인")

            var user = firebaseAuth.currentUser
            if(user != null){
                var iT = Intent(this, HomeActivity::class.java)
                startActivity(iT)
            }

        }

        //버튼입력을 통합처리
        btnClick()
    }

    override fun onResume() {
        super.onResume()
        FirebaseAuth.getInstance().addAuthStateListener (authStateListener!!)
    }

    override fun onStop() {
        super.onStop()
        FirebaseAuth.getInstance().removeAuthStateListener (authStateListener!!)
    }


    fun createEmailId(){
        FirebaseAuth.getInstance().createUserWithEmailAndPassword(et_id.text.toString(), et_pw.text.toString())
                .addOnCompleteListener { task ->
                    if(task.isSuccessful){
                        Toast.makeText(this, "회원가입 성공", Toast.LENGTH_LONG).show()
                    }else{
                        Toast.makeText(this, task.exception.toString(), Toast.LENGTH_LONG).show()
                    }
                }
    }

    fun loginId(){
        FirebaseAuth.getInstance().signInWithEmailAndPassword(et_id.text.toString(), et_pw.text.toString())
                .addOnCompleteListener { task ->
                    if(task.isSuccessful){
                        Toast.makeText(this, "로그인 성공", Toast.LENGTH_LONG).show()
                    }else{
                        Toast.makeText(this, task.exception.toString(), Toast.LENGTH_LONG).show()
                    }
                }
    }


    fun btnClick(){
        //회원가입 버튼을 눌렀을때
        btn_join.setOnClickListener{
            createEmailId()
        }

        //로그인 버튼을 눌렀을때
        btn_login.setOnClickListener{
            loginId()
        }
    }

}

HomeActivity.Kt

-로그인하면 여기로 이동, 버튼을 누르면 로그아웃

class HomeActivity : AppCompatActivity() {

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

        //로그아웃
        btn_logout.setOnClickListener {
            FirebaseAuth.getInstance().signOut()
            finish()
        }
    }
}