Google xml generator without google services gradle plugin

build.gradle

android {
productFlavors { // or build types
        dev {
            project.ext.setProperty("googleAppId", "your google app id") // for task in google_service_xml_generator.gradle
        }
        
        prod {
            project.ext.setProperty("googleAppId", "your google app id") // for task in google_service_xml_generator.gradle
        }
}

apply from: "${rootDir}/gradle_helper/google_service_xml_generator.gradle"

google_service_xml_generator.gradle

import groovy.xml.MarkupBuilder

import javax.inject.Inject

class GoogleXmlGenerator extends DefaultTask {
    private File outputDir
    private File outputFile
    private final String googleAppId

    @Inject
    GoogleXmlGenerator(String buildType, String flavor, String googleAppId) {
        this.googleAppId = googleAppId
        outputDir = new File(project.getBuildDir(), "generated/res/google-services/$flavor/$buildType/values/")
        outputFile = new File(outputDir, "values.xml")
    }

    @OutputFile
    File getOutputFile() {
        return outputFile
    }

    @TaskAction
    void letsDoTheShit() {
        def appId = googleAppId
        if (!outputFile.exists())
            outputFile.createNewFile()
        outputFile.withWriter { writer ->
            def xml = new MarkupBuilder(writer)
            xml.doubleQuotes = true
            xml.mkp.xmlDeclaration(version: '1.0', encoding: 'utf-8')
            xml.resources {
                string(name: "google_app_id", appId)

                mkp.yield('\n    ')
                mkp.comment("AUTO-GENERATED FILE.  DO NOT MODIFY. ${outputFile.name} is generated by the $name gradle task")
            }
        }
    }
}

afterEvaluate {
    android.applicationVariants.all { variant ->
        def variantName = variant.name.capitalize()
        def taskName = "generateGoogleXml${variantName}"
        if (variant.buildType.name == "release") {
            def projectId = project.ext.getProperty("googleAppId")
            def xmlGenerator = task "$taskName"(type: GoogleXmlGenerator, constructorArgs: [variant.buildType.name, variant.flavorName, projectId]) {
                group = "Osome"
                description = "Generate xml with google project id and oter properties for Crashlytics"
            }
            tasks.named("uploadCrashlyticsMappingFile$variantName").configure {
                dependsOn xmlGenerator
            }
        }
    }
}