인프런 커뮤니티 질문&답변

해당 부분 에서 FirebaseAuth, Firebase는 자동으로 import가 되는데 Firebase.auth 부분에서 뒤에 auth가 자동 import가 뜨질 않고 Unresolved reference:auth 에러가 계속 발생합니다. 한 번만 확인해주시면 감사하겠습니다. 

// LoginActivity
package com.fitdback.userinterface

import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import android.widget.Button
import android.widget.Toast
import com.fitdback.pointdetection.R
import com.google.firebase.auth.FirebaseAuth
import com.google.firebase.ktx.Firebase

class LoginTestActivity : AppCompatActivity() {

    private lateinit var auth: FirebaseAuth

    override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_login_test)

        // Initialize Firebase Auth
        auth = Firebase.auth

        val btnAnonymousLogin = findViewById<Button>(R.id.btnAnonymousLogin)
        btnAnonymousLogin.setOnClickListener {

            auth.signInAnonymously()
                .addOnCompleteListener(this) { task ->
                    if (task.isSuccessful) {
                        // Sign in success, update UI with the signed-in user's information
                        Log.d("LoginTestActivity", "signInAnonymously:success")
                        val user = auth.currentUser
//                        updateUI(user)
                    } else {
                        // If sign in fails, display a message to the user.
                        Log.w("LoginTesetActivity", "signInAnonymously:failure", task.exception)
                        Toast.makeText(
                            baseContext, "Authentication failed.",
                            Toast.LENGTH_SHORT
                        ).show()
//                       updateUI(null)
                    }
                }

        }

    }
}

// build.gradle(app)

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'

apply plugin: 'com.google.gms.google-services'

android {
    compileSdkVersion buildConfig.compileSdk
    defaultConfig {
        applicationId 'com.fitdback.userinterface'
        minSdkVersion buildConfig.minSdk
        targetSdkVersion buildConfig.targetSdk
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

        externalNativeBuild {
            cmake {
                arguments  '-DANDROID_TOOLCHAIN=clang', '-DANDROID_STL=gnustl_static'
                cppFlags "-std=c++11","-frtti", "-fexceptions"
            }
        }
        ndk {
            abiFilters 'armeabi-v7a'
        }
    }

//    externalNativeBuild {
//        cmake {
//            path "CMakeLists.txt"
//        }
//    }

    lintOptions {
        abortOnError false
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }

        debug {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }

    aaptOptions {
        noCompress "tflite"
    }

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    sourceSets {
        main {
            jniLibs.srcDirs = ['libs']
        }
    }
}

repositories {
    maven {
        url 'https://google.bintray.com/tensorflow'
    }
    flatDir {
        dirs 'libs'
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation project(':openCVLibrary341')
    implementation deps.kotlin.stdlib.jdk
//    implementation(name:'tensorflow-lite', ext:'aar')
    implementation deps.android.support.appcompatV7
    implementation deps.android.support.constraintLayout
    implementation deps.android.support.design
    implementation deps.android.support.annotations
    implementation deps.android.support.supportV13
    implementation deps.timber

    implementation 'org.tensorflow:tensorflow-lite:0.0.0-nightly'
    implementation 'org.tensorflow:tensorflow-lite-gpu:0.0.0-nightly'

    // Import the Firebase BoM
    implementation platform('com.google.firebase:firebase-bom:29.2.1')

    // Declare the dependency for the Firebase Authentication library
    // When using the BoM, you don't specify versions in Firebase library dependencies
    implementation 'com.google.firebase:firebase-auth-ktx'

    testImplementation deps.junit

    androidTestImplementation(deps.android.test.espresso, {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
}