7 - 구글 로그인

 

이번에는 구글 아이디로 로그인을 만들어보겠습니다.

 

 

 

 

여기에서 구글 로그인 설정을 하고

 

아래와 같이 코드를 추가해줍니다.

 

package com.bd.baemin_before_video.Auth

import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import android.widget.Toast
import com.bd.baemin_before_video.MainActivity
import com.bd.baemin_before_video.R
import com.google.android.gms.auth.api.signin.GoogleSignIn
import com.google.android.gms.auth.api.signin.GoogleSignInAccount
import com.google.android.gms.auth.api.signin.GoogleSignInClient
import com.google.android.gms.auth.api.signin.GoogleSignInOptions
import com.google.android.gms.common.api.ApiException
import com.google.android.material.snackbar.Snackbar
import com.google.firebase.auth.FirebaseAuth
import com.google.firebase.auth.GoogleAuthProvider
import kotlinx.android.synthetic.main.activity_join.*

class JoinActivity : AppCompatActivity() {

    private lateinit var auth: FirebaseAuth

    private lateinit var googleSignInClient: GoogleSignInClient


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

        // Configure Google Sign In
        val gso = GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
            .requestIdToken(getString(R.string.default_web_client_id))
            .requestEmail()
            .build()

        googleSignInClient = GoogleSignIn.getClient(this, gso)


        auth = FirebaseAuth.getInstance()

        join_login_button.setOnClickListener {

            auth.createUserWithEmailAndPassword(join_email_area.text.toString(), join_password_area.text.toString())
                .addOnCompleteListener(this) { task ->
                    if (task.isSuccessful) {

                        // Sign in success, update UI with the signed-in user's information
                        val intent = Intent(this, JoinInfoActivity::class.java)
                        startActivity(intent)

                    } else {

                        // If sign in fails, display a message to the user.
                        Toast.makeText(baseContext, "Authentication failed.", Toast.LENGTH_SHORT).show()

                    }

                }

        }


        google_button.setOnClickListener {

            Log.e(TAG, "google")
            signIn()
        }


    }

    private fun signIn() {
        val signInIntent = googleSignInClient.signInIntent
        startActivityForResult(signInIntent, RC_SIGN_IN)
    }

    public override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)

        // Result returned from launching the Intent from GoogleSignInApi.getSignInIntent(...);
        if (requestCode == RC_SIGN_IN) {
            val task = GoogleSignIn.getSignedInAccountFromIntent(data)
            try {
                // Google Sign In was successful, authenticate with Firebase
                val account = task.getResult(ApiException::class.java)
                firebaseAuthWithGoogle(account!!)

                val intent = Intent(this, JoinInfoActivity::class.java)
                startActivity(intent)

            } catch (e: ApiException) {
                // Google Sign In failed, update UI appropriately
                Log.w(TAG, "Google sign in failed", e)
                // ...
            }
        }
    }

    private fun firebaseAuthWithGoogle(acct: GoogleSignInAccount) {
        Log.d(TAG, "firebaseAuthWithGoogle:" + acct.id!!)

        val credential = GoogleAuthProvider.getCredential(acct.idToken, null)
        auth.signInWithCredential(credential)
            .addOnCompleteListener(this) { task ->
                if (task.isSuccessful) {
                    // Sign in success, update UI with the signed-in user's information
                    Log.d(TAG, "signInWithCredential:success")
                    val user = auth.currentUser

                } else {
                    // If sign in fails, display a message to the user.
                    Log.w(TAG, "signInWithCredential:failure", task.exception)


                }

                // ...
            }
    }

    companion object {
        private const val TAG = "GoogleActivity"
        private const val RC_SIGN_IN = 9001
    }



}

 

그 다음, mycominActivity에서 logout버튼을 만들어서 기능을 만들어주고

 

 

이러고 나면 구글 로그인도 완성!