Google Auth

Google Login 

https://grokonez.com/android/kotlin-firebase-authentication-google-sign-in-android

https://medium.com/@myric.september/authenticate-using-google-sign-in-kotlin-firebase-4490f71d9e44

Build.Gradle(Project: ~)

dependencies {
    classpath 'com.android.tools.build:gradle:3.3.0'
    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    classpath 'com.google.gms:google-services:4.2.0'
    // NOTE: Do not place your application dependencies here; they belong
    // in the individual module build.gradle files
}

Build.Gradle(Module: app)

    //Google Play Service
    implementation 'com.google.android.gms:play-services-auth:11.6.2'

    //Firebase
    implementation 'com.google.firebase:firebase-auth:11.6.2'
    implementation 'com.google.firebase:firebase-core:11.6.2'

GoogleAuth.kt (Activity)

class GoogleAuth : BaseActivity(), GoogleApiClient.OnConnectionFailedListener {

    //테스트
    //-----------------------------------------------------------------------
    val RC_SIGN_IN: Int = 1
    lateinit var mGoogleSignInClient: GoogleSignInClient
    lateinit var mGoogleSignInOptions: GoogleSignInOptions
    //-----------------------------------------------------------------------



    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(com.lipnus.R.layout.activity_googleAuth)

        configureGoogleSignIn()
        initLayout()

        mGoogleSignInClient.revokeAccess()
            .addOnCompleteListener(this) {
                // [START_EXCLUDE]
                Log.d("SSS", "revokeAccess()")
                // [END_EXCLUDE]
            }


    }

    private fun configureGoogleSignIn() {

        mGoogleSignInOptions = GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
            .requestIdToken("670975308456-s2pohalo6nhlktuhn8rke1ige00s66rj.apps.googleusercontent.com")
            .requestEmail()
            .build()

        mGoogleSignInClient = GoogleSignIn.getClient(this, mGoogleSignInOptions)
    }

    private fun signIn() {
        val signInIntent: Intent = mGoogleSignInClient.signInIntent
        startActivityForResult(signInIntent, RC_SIGN_IN)
    }


    override fun onStart() {
        super.onStart()

        val account = GoogleSignIn.getLastSignedInAccount(this)

        if(account!=null) {
            Log.d("SSS", "accout존재")
        }else{
            Log.d("SSS", "accout없음")
        }
    }


    override fun initLayout() {

        //구글로그인 버튼
        intro_google_btn.setOnClickListener {
            signIn()
        }

    }




    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        // Result returned from launching the Intent from GoogleSignInApi.getSignInIntent();

//        presenter.getGoogleSignInRequestCode()
        if (requestCode == 1) {
            val result = Auth.GoogleSignInApi.getSignInResultFromIntent(data)

            if (result.isSuccess) {
                // successful -> authenticate with Firebase
                val account = result.signInAccount
                Log.d("SSS", "구글토큰아이디: " + account!!.idToken)
                Log.d("SSS", "이메일: " + account!!.email)

            } else {
                // failed -> update UI
//                updateUI(null)
            }
        }
    }


    override fun onConnectionFailed(p0: ConnectionResult) {
        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
    }


}

mGoogleSignInClient.revokeAccess()

이걸 해줘야 선택창이 새로 뜬다. 안그러면 전에 했던 로그인 그대로 실행함.

이메일을 가져오는 용도로만 사용한다.