在用Kotlin编写的Modulair Android项目中初始化Firebase会产生未初始化的错误 [英] Initializing Firebase in Modulair Android project written in kotlin gives not initialized error

问题描述

我在尝试将Firebase实施到以kotlin编写的modulair android项目中时遇到困难.

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

我的结构如下:

• 应用
  • 功能
  • 基础
  • App
    • Feature
    • Base

    然后在oncreate的主要活动中，我调用FirebaseApp.inialize(this)

    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 }
    }
    

    我的带有实时数据的视图模型如下:

    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
    
      }
    }
    

    但是当我尝试运行该应用程序时，我会收到此消息

    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.
    

    我还尝试创建一个扩展应用程序的类，并调用firebaseapp.initialize(this)并将其添加到清单中，但是我仍然遇到相同的错误.

    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.

    清单:

     <?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:

    BaseApplication.kt:

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

    我的功能gradle

    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'
    

    推荐答案

    如果您正在使用功能(apply plugin: 'com.android.feature' )，则apply plugin: 'com.google.gms.google-services'和SDK的功能(api'com.google.firebase.~~~~~~ )需要添加到baseFeature gradle文件中.

    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.

    您还应该将google-services.json添加到该模块文件夹中！

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

    这篇关于在用Kotlin编写的Modulair Android项目中初始化Firebase会产生未初始化的错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！