AndResGuard

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AndResGuard is a tooling for reducing your apk size, it works like the ProGuard for Java source code, but only aim at the resource files. It changes res/drawable/wechat to r/d/a, and renames the resource file wechat.png to a.png. Finally, it repackages the apk with 7zip, which can reduce the package size obviously.

AndResGuard is fast, and it does NOT need the source codes. Input an Android apk, then we can get a 'ResGuard' apk in a few seconds.

Some uses of AndResGuard are:

1. Obfuscate android resources. It contains all the resource type(such as drawable、layout、string...). It can prevent your apk from being reversed by Apktool.

2. Shrinking the apk size. It can reduce the resources.arsc and the package size obviously.

3. Repackage with 7zip. It supports repackage apk with 7zip, and we can specify the compression method for each file.

AndResGuard is a command-line tool, it supports Windows, Linux and Mac. We suggest you to use 7zip in Linux or Mac platform for a higher compression ratio.

How to use

With Gradle

This has been released on Bintray

apply plugin: 'AndResGuard'

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.tencent.mm:AndResGuard-gradle-plugin:1.1.14'
    }
}

andResGuard {
    // mappingFile = file("./resource_mapping.txt")
    mappingFile = null
    use7zip = true
    useSign = true
    // it will keep the origin path of your resources when it's true
    keepRoot = false
    whiteList = [
        // your icon
        "R.drawable.icon",
        // for fabric
        "R.string.com.crashlytics.*",
        // for umeng update
        "R.string.umeng*",
        "R.string.UM*",
        "R.string.tb_*",
        "R.layout.umeng*",
        "R.layout.tb_*",
        "R.drawable.umeng*",
        "R.drawable.tb_*",
        "R.anim.umeng*",
        "R.color.umeng*",
        "R.color.tb_*",
        "R.style.*UM*",
        "R.style.umeng*",
        "R.id.umeng*",
        // umeng share for sina
        "R.drawable.sina*",
        // for google-services.json
        "R.string.google_app_id",
        "R.string.gcm_defaultSenderId",
        "R.string.default_web_client_id",
        "R.string.ga_trackingId",
        "R.string.firebase_database_url",
        "R.string.google_api_key",
        "R.string.google_crash_reporting_api_key"
    ]
    compressFilePattern = [
        "*.png",
        "*.jpg",
        "*.jpeg",
        "*.gif",
        "resources.arsc"
    ]
    sevenzip {
        artifact = 'com.tencent.mm:SevenZip:1.1.14'
        //path = "/usr/local/bin/7za"
    }
}

If you are using Android Studio, you can find the generate task option in andresguard group. Or alternatively, you run ./gradlew resguard[BuildType | Flavor] in your terminal. The format of task name is as same as assemble.

The sevenzip can be set by path or artifact. Mutiple assignments are allowed, but the winner is always path.

The outputted apk will be stored in {App}/build/output/apk/AndResGuard_{apk_name}/{apk_name}_signed_7zip_aligned.apk.

Looking for more detail

Thanks

Apktool Used ASRCDecoder.