Cannot set the value of read-only property 'outputFile' for ApkVariantOutputImpl_Decorated

之前在旧版本Android Studio中用以下代码修改过release版本的apk名：

applicationVariants.all { variant ->     variant.outputs.each { output ->        def SEP = "_"        def flavor = variant.productFlavors[0].name        def buildType =         variant.variantData.variantConfiguration.buildType.name        def version = variant.versionName        def date = new Date()        def formattedDate = date.format('ddMMyy_HHmm')        def newApkName = PROJECT_NAME + SEP + flavor + SEP + buildType + SEP + version + SEP + formattedDate + ".apk"        def file = new File(newApkName)        output.outputFile = file    }} 

然而升级Android Studio 3.0 后编译不通过，并报了以下错误：

Cannot set the value of read-only property ‘outputFile’ for ApkVariantOutputImpl_Decorated{apkData=Main{type=MAIN, fullName=debug, filters=[]}} of type com.android.build.gradle.internal.api.ApkVariantOutputImpl.

原因

Android Studio 3.0 修改了打包规则，详细规则见 Android plugin 3.0 migration guide（需翻墙）

解决方法

• 使用 all() 替换 each()

• 使用 outputFileName 替换 output.outputFile

示例

// If you use each() to iterate through the variant objects,// you need to start using all(). That's because each() iterates// through only the objects that already exist during configuration time—// but those object don't exist at configuration time with the new model.// However, all() adapts to the new model by picking up object as they are// added during execution.android.applicationVariants.all { variant ->    variant.outputs.all {        outputFileName = "${variant.name}-${variant.versionName}.apk"    }}

参考链接：
https://stackoverflow.com/questions/44239235/android-gradle-3-0-0-alpha2-plugin-cannot-set-the-value-of-read-only-property