How to change apk name by using gradle like this format?

I'd like to change "app-release.apk" file name to like following when I build an app by using gradle.

[format]
(appname of package name)V(version code)(yyMMdd)_(R|T)

[explain]
(appname of package name) : example) com.example.myApp -> myApp
(version code) : build version code 2.2.3 -> 223
(yyMMdd) : build date 2015.11.18 -> 151118

(R|T) : if app is release, "R" but debug is "T".

If I generate an apk file in release, result is : myApp_V223_151118_R.apk.

How to make a file name like this in gradle?

This may be the shortest way:

defaultConfig {
    ...
    applicationId "com.blahblah.example"
    versionCode 1
    versionName "1.0"
    setProperty("archivesBaseName", applicationId + "-v" + versionCode + "(" + versionName + ")")
}

buildType: like so

buildTypes {
    debug {
        ...
        versionNameSuffix "-T"
    }
    release {
        ...
        versionNameSuffix "-R"
    }
}

Keep in mind, Android Studio adds versionNameSuffix by build type name by default, so you may not need this.

Upd. In new versions of Android Studio you can it write little shorter(thanks for szx comment):

defaultConfig {
    ...
    archivesBaseName = "$applicationId-v$versionCode($versionName)"
}

Update: Please check Anrimian's answer below which is much simpler and shorter.

Try this:

gradle.properties

applicationName = MyApp

build.gradle

android {
  ...
  defaultConfig {
     versionCode 111
     ...
  }
  buildTypes {
     release {
         ...
         applicationVariants.all { variant ->
             renameAPK(variant, defaultConfig, 'R')
         }
     }
     debug {
         ...
         applicationVariants.all { variant ->
             renameAPK(variant, defaultConfig, 'T')
         }
     }
  }
}
def renameAPK(variant, defaultConfig, buildType) {
 variant.outputs.each { output ->
     def formattedDate = new Date().format('yyMMdd')

     def file = output.packageApplication.outputFile
     def fileName = applicationName + "_V" + defaultConfig.versionCode + "_" + formattedDate + "_" + buildType + ".apk"
     output.packageApplication.outputFile = new File(file.parent, fileName)
 }
}

Reference: https://stackoverflow.com/a/30332234/206292 https://stackoverflow.com/a/27104634/206292

2019 / 2020 - How to change APK name For Gradle 3.3, 3.4, 3.5, 4.0 and above

android {
   ......
   applicationVariants.all { variant ->
       variant.outputs.all {
           def flavor = variant.name
           def versionName = variant.versionName
           outputFileName = "prefix_${flavor}_${versionName}.apk"
       }
   }
}

The result would be like this,

> prefix_release_1.0.1.apk