Cannot set the value of read-only property 'outputFile' for ApkVariantOutputImpl_Decorated with android studio 3.1.3

Question

Hello friends,
I am facing one issue in app.gradle file when use proguard ruls with new android studio version is 3.1.3. its working proper on old studio version 2.3.3.
My full error 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.

App.Gradle file:
android { ..................... buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' applicationVariants.all { variant -> variant.outputs.each { output -> output.outputFile = new File(output.outputFile.parent, output.outputFile.name.replace(".apk", "-" + defaultConfig.versionName + ".apk")) } } } } }

Thnaks,

Answer 1

For Gradle 3.0+**

android {
...
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        applicationVariants.all { variant ->
            variant.outputs.all {
                def formattedDate = new Date().format('yyyyMMddHHmmss')
                def flavor = variant.name
                def versionName = variant.versionName
                outputFileName = "AppName_${versionName}_${flavor}_${formattedDate}.apk"
            }
        }
    }
}
...
}

Result :

AppName_release_1_20200121175123.apk

Answer 2

The outputFile property is not available from the variant output anymore. You should be able to get it like that:

def variantOutput = ...
def outputFile

try
{
    outputFile = variantOutput.outputFile
}
catch (Exception ex)
{
    def packageTask = variantOutput.packageApplication
    outputFile = packageTask.outputFile
}