How to change the proguard mapping file name in gradle for Android project

Question

I have android project based on gradle and I want to change mapping.txt file name after it\'s generated for my build. How can it be done?

upd

How it can be d

Answer 1

Pinhassi's solution above works great and it is conforms to the latest Gradle changes. There are a couple of things though that I had to change:

1. The module name is hardcoded ("app"), which is not ideal since in a lot of cases (including mine) that will not be true. It is better to dynamically detect the module name.
2. The mapping file also only conforms to the Windows file system by having backward escaped slashes ("\"). If you are on a *NIX system like Linux or Mac, you need to replace those with forward non escaped slashes ("/")
3. Changed a bit the renaming of the .apk file to include the project name and added a date/time stamp at the end.

Here is the finished code:

import java.util.regex.Matcher
import java.util.regex.Pattern

buildTypes {
        release {
        debuggable false
        minifyEnabled true
        proguardFiles 'proguard.cfg'

        // Rename the apk file and copy the ProGuard mapping file to the root of the project
        applicationVariants.all { variant ->
            if (variant.getBuildType().name.equals("release")) {
                def formattedDate = new Date().format('yyyyMMddHHmmss')
                def projectName = ""
                variant.outputs.each { output ->
                    def fullName = output.outputFile.name
                    projectName = fullName.substring(0, fullName.indexOf('-'))
                    // ${variant.name} has the value of "paidRelease"
                    output.outputFile = new File((String) output.outputFile.parent, (String) output.outputFile.name.replace(".apk", "-v${variant.versionName}-${formattedDate}.apk"))
                }
                def mappingFile = "${rootDir}/${projectName}/build/outputs/mapping/${getCurrentFlavor()}/release/mapping.txt"
                println("mappingFile:  ${mappingFile}")
                if (variant.getBuildType().isMinifyEnabled()) {
                    variant.assemble.doLast {
                        copy {
                            from "${mappingFile}"
                            into "${rootDir}"
                            rename { String fileName ->
                                "mapping-${variant.name}.txt"
                            }
                        }
                    }
                }
            }
        }
    }

        debug {
            debuggable true
        }
    }

def getCurrentFlavor() {
    Gradle gradle = getGradle()
    String  tskReqStr = gradle.getStartParameter().getTaskRequests().toString()
    Pattern pattern;

    if( tskReqStr.contains( "assemble" ) )
        pattern = Pattern.compile("assemble(\\w+)(Release|Debug)")
    else
        pattern = Pattern.compile("generate(\\w+)(Release|Debug)")

    Matcher matcher = pattern.matcher( tskReqStr )

    if( matcher.find() )
        return matcher.group(1).toLowerCase()
    else {
        println "NO MATCH FOUND"
        return "";
    }
}