CODEWITHSUNDEEP
javaandroidimageresourcesproguard
Mikel Pascual
Mikel Pascual

Reputation: 2211

Remove unused resources from Android app on compile time

I am currently trying to remove unused graphical resources from an app in compile time. I know Android Studio can help me manually remove unused ones, but I need to be able to remove them in compile time; this way, I can run Proguard to remove unused classes, and then remove any images referenced from those classes.

Right now I can do this, which gets me any unused image shrunk to a 1x1 black dot:

android {
    buildTypes {
        release {
            minifyEnabled true
            shrinkResources true
        }
    }
}

I can't have those files there (even shrunk). Is there a way to make Proguard actually remove those images (instead of shrink them) or rename them? Maybe I could use some other tool?

edit: just for clarification, I would need the resources rendered "unused" by Proguard to be removed or renamed.

Upvotes: 2

Views: 1551

Answers (3)

Eric Lafortune
Eric Lafortune

Reputation: 45648

ProGuard (or the new Jack compiler) only shrink and obfuscate bytecode. The resource shrinking tool subsequently removes or replaces unused resource files.

ProGuard's commercial extension DexGuard shrinks, optimizes, and obfuscates bytecode, the Android manifest, resources, resource files, asset files, and native libraries. As far as I'm aware, it's the only tool that analyzes and optimizes all contents at the same time. For instance, it indeed removes unused classes and corresponding unused resources and resource files.

[we develop ProGuard and DexGuard at GuardSquare]

Upvotes: 1

Neh
Neh

Reputation: 452

If you are looking for some utility, you can use https://code.google.com/archive/p/android-unused-resources/

or https://github.com/KeepSafe/android-resource-remover

Hope this helps.

Upvotes: 0

Shanto George
Shanto George

Reputation: 994

To remove unused resources you can use Android Lint tool from ADT 16. It will help you not only to remove unused resources, but also to find potential bugs.

http://tools.android.com/tips/lint

You can also enable proguard in release mode

The ProGuard tool shrinks, optimizes, and obfuscates your code by removing unused code and renaming classes, fields, and methods with semantically obscure names. The result is a smaller sized .apk file that is more difficult to reverse engineer.

http://developer.android.com/tools/help/proguard.html

You can easily search for unused resources from Android Studio. Just press Control + Alt + Shift + i and type "Unused resources" (without quotes). That will execute lint. Super easy way how run lint commands (and other stuff from IDE).

Upvotes: 0

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