1)。谷歌提供什么服务?Json真的有用吗?

关注这个:https://stackoverflow.com/a/31598587/2382964

2)。谷歌是如何服务的。Json文件影响你的android工作室项目?

关注这个:https://stackoverflow.com/a/33083898/2382964

简单来说就是第二个url，如果你添加google-services。Json在你的项目中必须有一个自动生成的google-services文件夹在这个路径下调试变量

app/build/generated/res/google-services/debug/values/values.xml

3)。该怎么做，才能把事情做好?

在project_level构建中添加google-services依赖项。Gradle，如果你使用app_compact库，你也可以使用3.0.0版本。

// Top-level build.gradle file
classpath 'com.google.gms:google-services:2.1.2'

现在在app_level build中。你必须在底部添加Gradle。

// app-level build.gradle file
apply plugin: 'com.google.gms.google-services'

注意:在gradle文件底部添加这一行非常重要。否则Gradle构建不会给你任何错误，但它不能正常工作。

4)。谷歌服务该放在哪里?Json文件在你的结构。

如果你没有build_flavor，就把它放在inside /app/google-service中。json文件夹。

情况2.)如果你有多个build_flavor并且你有不同的google_services。Json文件放在app/src/build_flavor/google-service.json中。

情况3.)如果你有多个build_flavor和单个google_services。Json文件放在app/google-service.json中。

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

    ...
    gradle.taskGraph.beforeTask { Task task ->
        if (task.name ==~ /process.*GoogleServices/) {
            android.applicationVariants.all { variant ->
                if (task.name ==~ /(?i)process${variant.flavorName}(Debug|Release)GoogleServices/) {
                    copy {
                        from "src/tenants/${variant.flavorName}"
                        include 'google-services.json'
                        into '.'
                    }
                }
            }
        }
    }

    gradle.taskGraph.afterTask { Task task ->
        if (task.name ==~ /process.*GoogleServices/) {
            android.applicationVariants.all { variant ->
                if (task.name ==~ /(?i)process${variant.flavorName}(Debug|Release)GoogleServices/) {
                    delete fileTree(".").matching {
                        include 'google-services.json'
                    }
                }
            }
        }
    }

我们对调试构建有不同的包名(*.debug)，所以我想要一些基于flavor和buildType的东西，而不必在processDebugFlavorGoogleServices的模式中编写任何与flavor相关的东西。

我在每个版本中创建了一个名为“google-services”的文件夹，包含了json文件的调试版本和发布版本:

在gradle文件的buildTypes部分，添加以下内容:

    applicationVariants.all { variant ->
            def buildTypeName = variant.buildType.name
            def flavorName = variant.productFlavors[0].name;

            def googleServicesJson = 'google-services.json'
            def originalPath = "src/$flavorName/google-services/$buildTypeName/$googleServicesJson"
            def destPath = "."

            copy {
                if (flavorName.equals(getCurrentFlavor()) && buildTypeName.equals(getCurrentBuildType())) {
                    println originalPath
                    from originalPath
                    println destPath
                    into destPath
                }
            }
    }

当你切换构建变量时，它会自动在你的应用模块的根处复制正确的json文件。

在build.gradle的根中添加这两个被调用的方法，以获取当前风格和当前构建类型

def getCurrentFlavor() {
    Gradle gradle = getGradle()
    String  tskReqStr = gradle.getStartParameter().getTaskRequests().toString()

    Pattern pattern;

    if( tskReqStr.contains( "assemble" ) )
        pattern = Pattern.compile("assemble(\\w+)(Release|Debug)")
    else
        pattern = Pattern.compile("generate(\\w+)(Release|Debug)")

    Matcher matcher = pattern.matcher( tskReqStr )

    if( matcher.find() ) {
        println matcher.group(1).toLowerCase()
        return matcher.group(1).toLowerCase()
    }
    else
    {
        println "NO MATCH FOUND"
        return "";
    }
}

def getCurrentBuildType() {
    Gradle gradle = getGradle()
    String  tskReqStr = gradle.getStartParameter().getTaskRequests().toString()

        if (tskReqStr.contains("Release")) {
            println "getCurrentBuildType release"
            return "release"
        }
        else if (tskReqStr.contains("Debug")) {
            println "getCurrentBuildType debug"
            return "debug"
        }

    println "NO MATCH FOUND"
    return "";
}

就是这样，你不必担心从你的gradle文件中删除/添加/修改口味，它得到调试或发布谷歌服务。自动json。

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”

谷歌服务。Json文件是不必要的接收通知。只要在你的构建中为每种味道添加一个变量。gradle文件:

buildConfigField "String", "GCM_SENDER_ID", "\"111111111111\""

使用这个变量BuildConfig。GCM_SENDER_ID代替getString(R.string.gcm_defaultSenderId)注册时:

instanceID.getToken(BuildConfig.GCM_SENDER_ID, GoogleCloudMessaging.INSTANCE_ID_SCOPE, null);