Initializing Firebase in Modulair Android project written in kotlin gives not initialized error

问题

I'm having difficulty trying to implement firebase into an modulair android project written in kotlin.

My structure looks like this:

• App
  • Feature
  • Base

And then in my main activity oncreate I'm calling the FirebaseApp.inialize(this)

override fun onCreate(savedInstanceState: Bundle?) {
  super.onCreate(savedInstanceState)
  FirebaseApp.initializeApp(this)
  setContentView(R.layout.activity_main)
  spotifyAuthDataViewModel = ViewModelProviders.of(this)
    .get(SpotifyAuthDataViewModel::class.java)

  val liveData = spotifyAuthDataViewModel.getAuthData()
  info { liveData.value!!.spotifyToken }
}

My viewmodel with livedata looks like this:

    class SpotifyAuthDataViewModel : ViewModel() {
  var authData: MutableLiveData<SpotifyAuthData> = MutableLiveData()
  private var mDatabase: DatabaseReference? = null

  fun getAuthData(): LiveData<SpotifyAuthData> {
    mDatabase = FirebaseDatabase.getInstance().reference
    FirebaseDatabase.getInstance()
          .getReference("/spotify_data")
          .addListenerForSingleValueEvent(object : ValueEventListener {
            override fun onCancelled(p0: DatabaseError?) {
            }

            override fun onDataChange(dataSnapshot: DataSnapshot) {
              if (dataSnapshot.exists()) {
                var spotifyAuthData: SpotifyAuthData? =
                  dataSnapshot.getValue<SpotifyAuthData>(SpotifyAuthData::class.java)
                authData.postValue(spotifyAuthData)
              }
            }
          }
          )

    return authData

  }
}

But when i try to run the app i'm getting this message

  java.lang.RuntimeException: Unable to resume activity {com.jd.test.app/com.jd.test.feature.MainActivity}: java.lang.IllegalStateException: Default FirebaseApp is not initialized in this process com.jd.test.app. Make sure to call FirebaseApp.initializeApp(Context) first.

I also tried creating an class extending my application and calling firebaseapp.initialize(this) and adding this to my manifest but i still got the same error.

Manifest:

 <?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        package="com.jd.test.feature">
      <uses-permission android:name="android.permission.INTERNET" />
      <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
  <application android:name=".BaseApplication">
    <activity android:name=".MainActivity"
        android:theme="@style/AppTheme">
      <intent-filter android:order="1">
        <action android:name="android.intent.action.VIEW"/>
        <category android:name="android.intent.category.BROWSABLE"/>
        <category android:name="android.intent.category.DEFAULT"/>

        <data
            android:host=""
            android:pathPrefix="/.*"
            android:scheme="https"/>
      </intent-filter>
      <intent-filter>
        <action android:name="android.intent.action.MAIN"/>

        <category android:name="android.intent.category.LAUNCHER"/>
      </intent-filter>
    </activity>
    <activity android:name=".spotify.views.SpotifyLogin"/>
  </application>


</manifest>

BaseApplication.kt:

class BaseApplication : Application() {
  override fun onCreate() {
    super.onCreate()
    FirebaseApp.initializeApp(this)
  }
}

My feature gradle

    apply plugin: 'com.android.feature'

apply plugin: 'kotlin-android'

apply plugin: 'kotlin-android-extensions'

apply plugin: 'kotlin-kapt'

android {
  compileSdkVersion 27
  defaultConfig {
    minSdkVersion 23
    targetSdkVersion 27
    versionCode 1
    versionName "1.0"
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
  }
  buildTypes {
    debug {
      useProguard false
      minifyEnabled false
    }
    release {
      minifyEnabled false
      proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
  }
}

repositories {
  flatDir {
    dirs 'libs'
  }
}

dependencies {
  def lifecycle_version = "1.1.0"

  implementation fileTree(dir: 'libs', include: ['*.jar'])
  implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
  implementation 'io.github.tonnyl:spark:0.1.0-alpha'
  implementation 'com.github.Joran-Dob:PlayPauseFab:0.0.3'
  implementation project(':base')
  implementation 'com.android.support:cardview-v7:27.1.1'
  implementation 'com.android.support:recyclerview-v7:27.1.1'
  implementation 'com.github.bumptech.glide:glide:4.4.0'
  implementation "com.squareup.retrofit2:retrofit:2.3.0"
  implementation "com.squareup.retrofit2:adapter-rxjava2:2.3.0"
  implementation "com.squareup.retrofit2:converter-gson:2.3.0"
  implementation 'com.squareup.okhttp3:logging-interceptor:3.9.1'
  implementation "io.reactivex.rxjava2:rxandroid:2.0.1"
  implementation 'com.spotify.android:auth:1.1.0'
  implementation 'com.spotify.sdk:spotify-player-24-noconnect-2.20b@aar'
  implementation "org.jetbrains.anko:anko:0.10.5"
  implementation 'com.android.support:palette-v7:27.1.1'
  implementation 'com.android.support:appcompat-v7:27.1.1'
  implementation 'com.android.support.constraint:constraint-layout:1.1.0'
  implementation 'com.google.firebase:firebase-core:15.0.2'
  implementation 'com.google.firebase:firebase-database:15.0.1'
  implementation "android.arch.lifecycle:extensions:$lifecycle_version"
  implementation "android.arch.lifecycle:viewmodel:$lifecycle_version" // use -ktx for Kotlin
  implementation "android.arch.lifecycle:livedata:$lifecycle_version"
  kapt "android.arch.lifecycle:compiler:$lifecycle_version"
  kapt 'com.github.bumptech.glide:compiler:4.4.0'
  testImplementation 'junit:junit:4.12'
  androidTestImplementation 'com.android.support.test:runner:1.0.2'
  androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}
apply plugin: 'com.google.gms.google-services'

回答1:

The com.google.gms.google-services Gradle plugin only works with modules that are Android application modules that apply the com.android.application plugin. It doesn't work with library modules or feature modules.

When you apply the google-services plugin, it will make changes to your app that allow it to initialize automatically, using information found in your google-services.json file.

回答2:

If you are using features (apply plugin: 'com.android.feature' ) then the apply plugin: 'com.google.gms.google-services' and the SDK's (api 'com.google.firebase.~~~~~~) need to be added to the baseFeature gradle file.

You should also add the google-services.json to this modules folder!

来源：https://stackoverflow.com/questions/50308838/initializing-firebase-in-modulair-android-project-written-in-kotlin-gives-not-in