Android Gradle 3.0.0-alpha2插件，无法设置只读属性'outputFile'的值

问题描述：

我正在使用此代码

i was using this code

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
    }
}

在我构建新的apk时更改apk文件的名称，但是由于我使用的是 Android Studio 3.0 Canary 2 ，因此会出现以下错误:
无法设置只读属性'outputFile'的值....

to change the name of apk file when i build new apk, but since i use the Android Studio 3.0 Canary 2 this error appear:
Cannot set the value of read-only property 'outputFile'....

答

作为

使用all()代替each()

如果仅更改文件名(这是您的情况)，请使用outputFileName而不是output.outputFile

Use all() instead of each()
Use outputFileName instead of output.outputFile if you change only file name (that is your case)

指南中的示例:

// 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"
    }
}

Android Gradle 3.0.0-alpha2插件，无法设置只读属性'outputFile'的值

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