我发现google-services插件对于想要添加GCM的项目来说是非常无用的。它只生成以下文件，简单地将您的项目ID添加为字符串资源:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <!-- Your API key would be on the following line -->
    <string name="gcm_defaultSenderId">111111111111</string>
</resources>

似乎只有在直接从Cloud Messaging for Android指南复制样例代码时才需要它。下面是示例行:

String token = instanceID.getToken(getString(R.string.gcm_defaultSenderId),              GoogleCloudMessaging.INSTANCE_ID_SCOPE, null);

解决方案

如果您希望能够为不同的构建类型或产品风格切换API项目，您只需定义自己的常量，并在调用getToken() API时选择适当的常量。

private static final String SENDER_ID = "111111111111";
private static final String SANDBOX_SENDER_ID = "222222222222";

String token = instanceID.getToken(
        BuildConfig.DEBUG ? SENDER_ID : SANDBOX_SENDER_ID,
        GoogleCloudMessaging.INSTANCE_ID_SCOPE,
        null);

产品口味

上面的代码用于在调试和发布版本之间切换。对于产品类型，您可以在java源文件中定义不同的API键，并将这些文件放在相应的产品类型目录中。参考:Gradle Build variables

只需在同一个项目中添加调味应用程序id和口味的名称，下载google-service。Json文件，它将在客户端数组[]中包含所有口味，这将适用于所有口味。

谷歌在play服务插件的2.0版本中包含了对不同口味的支持。由于这个版本的gradle插件com.google.gms:google-services:2.0.0-alpha3

你可以这样做

第一步:添加到gradle

// To auto-generate google map api key of google-services.json
implementation 'com.google.android.gms:play-services-maps:17.0.0'

第二步:在应用程序标签中添加到AndroidManifest.xml

<meta-data
    android:name="com.google.android.geo.API_KEY"
    android:value="@string/google_api_key" />

第三步:从firebase下载每个flavor JSON文件并添加

app/src/
    flavor1/google-services.json
    flavor2/google-services.json

3.0.0版本的插件在这些位置搜索JSON文件(考虑到你有一个flavor flavor1和一个构建类型调试):

/app/src/debug/google-services.json
/app/src/debug/flavor1/google-services.json
/app/google-services.json

即使使用flavorDimensions，我也能做到。一个维度是免费和付费，另一个维度是模拟和刺激。我还有3个构建类型:调试、发布和登台。这是它在我的FreeProd项目中的外观:

有多少谷歌服务?json文件将取决于你的项目的特点，但你将需要至少一个json文件为每个谷歌项目。

如果你想了解更多关于这个插件如何处理这些JSON文件的细节，下面是: https://github.com/googlesamples/google-services/issues/54#issuecomment-165824720

官方文档链接: https://developers.google.com/android/guides/google-services-plugin

更新信息的博客文章:https://firebase.googleblog.com/2016/08/organizing-your-firebase-enabled-android-app-builds.html

去这里查看这个插件的最新版本:https://mvnrepository.com/artifact/com.google.gms/google-services?repo=google

简短的回答:

实现: 默认情况下，您应该复制google-services。Json到app dir。

如果想要获得其他效果，可以复制谷歌的服务。Json到app/src/{flavor-name}目录

测试: 尝试构建，打开构建选项卡，然后使用解析json文件检查输出消息:.....

remove the existing google-services.json from your project. Build > Clean Project compile and run your app look at the error message that comes up to figure out where you can put your google-services.json..mine looked like this File google-services.json is missing. The Google Services Plugin cannot function without it. Searched Location: C:\Users\username\Desktop\HelloWorld\app\src\devSuffixYes_EnvQaApistaging_\google-services.json C:\Users\username\Desktop\HelloWorld\app\src\debug\google-services.json C:\Users\username\Desktop\HelloWorld\app\src\devSuffixYes_EnvQaApistaging_Debug\google-services.json C:\Users\username\Desktop\HelloWorld\app\src\dev\google-services.json C:\Users\username\Desktop\HelloWorld\app\src\devDebug\google-services.json C:\Users\username\Desktop\HelloWorld\app\src\devSuffixYes_EnvQaApistaging_\debug\google-services.json C:\Users\username\Desktop\HelloWorld\app\src\debug\devSuffixYes_EnvQaApistaging_\google-services.json C:\Users\username\Desktop\HelloWorld\app\src\dev\debug\google-services.json C:\Users\username\Desktop\HelloWorld\app\src\dev\suffix\google-services.json C:\Users\username\Desktop\HelloWorld\app\src\dev\suffixDebug\google-services.json C:\Users\username\Desktop\HelloWorld\app\src\dev\suffix\debug\google-services.json C:\Users\username\Desktop\HelloWorld\app\src\dev\suffix\yes_\google-services.json C:\Users\username\Desktop\HelloWorld\app\src\dev\suffix\yes_Debug\google-services.json C:\Users\username\Desktop\HelloWorld\app\src\dev\suffix\yes_\debug\google-services.json C:\Users\username\Desktop\HelloWorld\app\src\dev\suffix\yes_\env\google-services.json C:\Users\username\Desktop\HelloWorld\app\src\dev\suffix\yes_\envDebug\google-services.json C:\Users\username\Desktop\HelloWorld\app\src\dev\suffix\yes_\env\debug\google-services.json C:\Users\username\Desktop\HelloWorld\app\src\dev\suffix\yes_\env\qa\google-services.json C:\Users\username\Desktop\HelloWorld\app\src\dev\suffix\yes_\env\qaDebug\google-services.json C:\Users\username\Desktop\HelloWorld\app\src\dev\suffix\yes_\env\qa\debug\google-services.json C:\Users\username\Desktop\HelloWorld\app\src\dev\suffix\yes_\env\qa\apistaging_\google-services.json C:\Users\username\Desktop\HelloWorld\app\src\dev\suffix\yes_\env\qa\apistaging_Debug\google-services.json C:\Users\username\Desktop\HelloWorld\app\src\dev\suffix\yes_\env\qa\apistaging_\debug\google-services.json C:\Users\username\Desktop\HelloWorld\app\google-services.json

注意:它还关心flavorDimensions中声明的顺序。我的是flavorDimensions“dev_suffix”，“environment”

根据@ZakTaccardi的回答，并且假设您不想在两个版本中都使用一个项目，请将此添加到构建的末尾。gradle文件:

def appModuleRootFolder = '.'
def srcDir = 'src'
def googleServicesJson = 'google-services.json'

task switchToStaging(type: Copy) {
    outputs.upToDateWhen { false }
    def flavor = 'staging'
    description = "Switches to $flavor $googleServicesJson"
    delete "$appModuleRootFolder/$googleServicesJson"
    from "${srcDir}/$flavor/"
    include "$googleServicesJson"
    into "$appModuleRootFolder"
}

task switchToProduction(type: Copy) {
    outputs.upToDateWhen { false }
    def flavor = 'production'
    description = "Switches to $flavor $googleServicesJson"
    from "${srcDir}/$flavor/"
    include "$googleServicesJson"
    into "$appModuleRootFolder"
}

afterEvaluate {
    processStagingDebugGoogleServices.dependsOn switchToStaging
    processStagingReleaseGoogleServices.dependsOn switchToStaging
    processProductionDebugGoogleServices.dependsOn switchToProduction
    processProductionReleaseGoogleServices.dependsOn switchToProduction
}

你需要src/staging/google-services文件。Json和src/production/google-services.json。替换您所使用的风味名称。