Firebase数据库getInstance崩溃

Question

我已经看到很多问题,询问为什么应用程序崩溃时出现以下错误日志:无法获取FirebaseDatabase实例:FirebaseApp对象的FirebaseOptions对象中没有DatabaseURL.

我通过Android studio配置了firebase.

我仍然遇到错误.

我相信google-services.json文件没有错误,因为这是由Android Studio自动创建的.

任何帮助,将不胜感激!

我很乐意添加有关我要求提供的任何代码的更多详细信息.

编辑:创建数据库实例

 FirebaseDatabase database = FirebaseDatabase.getInstance();

    DatabaseReference myRef = database.getReference("message");
    myRef.setValue("Hello, Wrld!");

这是我的应用程序级别:

apply plugin: 'com.android.application'

android {
compileSdkVersion 24
buildToolsVersion "24.0.3"

defaultConfig {
    applicationId "com.mypackage"
    minSdkVersion 15
    targetSdkVersion 24
    versionCode 1
    versionName "1.0"
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}

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

productFlavors {
    lite {
        applicationId "com.mypackage.a"
        versionCode 6
        versionName "3.0.0-lite"
    }
    pro {
        applicationId "com.mypackage.b"
        versionCode 1
        versionName "3.0.0-pro"
    }
}
}

dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
    exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:24.2.1'
compile 'com.facebook.android:facebook-android-sdk:4.16.1'
testCompile 'junit:junit:4.12'
compile 'com.google.firebase:firebase-database:9.8.0'
compile 'com.google.firebase:firebase-core:9.8.0'
compile 'com.google.firebase:firebase-crash:9.8.0'

compile 'com.google.android.gms:play-services-ads:9.8.0'

compile 'com.google.android.gms:play-services-places:9.8.0'
compile 'joda-time:joda-time:2.9.4'

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

这是我的项目级别:

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
repositories {
    jcenter()
}
dependencies {
    classpath 'com.android.tools.build:gradle:2.2.2'

    classpath 'com.google.gms:google-services:3.0.0'


    // NOTE: Do not place your application dependencies here; they belong
    // in the individual module build.gradle files
}
}

allprojects {
repositories {
    jcenter()
}
}

task clean(type: Delete) {
delete rootProject.buildDir
}

编辑:此外,即使我删除我的google-services.json文件,代码仍然编译并在运行时失败.这是出乎意料的.我应该得到一个不让文件编译的错误.

谢谢

Answer 1

请在Firebase上创建项目,然后使用适当的包名添加应用程序,将下载的json文件放入您的应用中:

我认为目前的文件没有

 "project_info": {
    "project_number": "566986018979",
    "firebase_url": "https://test-fcm-17958.firebaseio.com",
    "project_id": "test-fcm-17958",
    "storage_bucket": "test-fcm-17958.appspot.com"

  }

Firebase网址表示尚未添加任何应用程序可能在项目配置中存在一些问题

首先尝试使用默认引用
mDatabase = FirebaseDatabase.getInstance().getReference();