Target a build variant

If you have different versions of your app based on different build variants, create custom keep rules for each variant. For example, if you have a free tier and a paid tier of your app with different features and dependencies, each tier should have its own keep rules.

Create keep rules

For AGP 9.3+:

To maintain specific keep rules for different flavors of your app, place the keep rules for each flavor in the relevant keep rules source set . For example, for flavor1, write keep rules in app/src/flavor1/keepRules/flavor1-rules.keep.

AGP 9.3+ (Kotlin)

android {
    buildTypes {
        release {
            optimization {
                enable = true // Enables code and resource optimizations.
            }
        }
    }
    flavorDimensions.add("version")
        productFlavors {
            create("flavor1") {
                ...
                // Place your keep rules in app/src/flavor1/keepRules/ with the file suffix .keep
            }
            create("flavor2") {
                ...
                // Place your keep rules in app/src/flavor2/keepRules/ with the file suffix .keep
            }
        }
}

AGP 9.3+ (Groovy)

android {
    buildTypes {
        release {
            optimization {
                enable = true // Enables code and resource optimizations.
            }
        }
    }
    flavorDimensions "version"
    productFlavors {
        flavor1 {
            ...
        }
        flavor2 {
            ...
            // Place your keep rules in app/src/flavor2/keepRules/ with the file suffix .keep
        }
    }
}

For AGP versions earlier than 9.3:

To create keep rules that are specific to a build variant, add the proguardFiles property in the corresponding flavor block under productFlavors.

Consider the following build script that adds the rules file flavor2‑rules.pro to the flavor2 product flavor:

Legacy DSL (Kotlin)

android {
    ...
    buildTypes {
        getByName("release") {
            isMinifyEnabled = true
            isShrinkResources = true
            proguardFiles(
                getDefaultProguardFile("proguard-android-optimize.txt"),
                "proguard-rules.pro"
            )
        }
    }
    flavorDimensions.add("version")
        productFlavors {
            create("flavor1") {
                ...
            }
            create("flavor2") {
                proguardFile("flavor2-rules.pro")
            }
        }
}

Legacy DSL (Groovy)

android {
    ...
    buildTypes {
        release {
            minifyEnabled = true
            shrinkResources = true
            proguardFiles(
                getDefaultProguardFile('proguard-android-optimize.txt'),
                'proguard-rules.pro'
            )
        }
    }
    flavorDimensions "version"
    productFlavors {
        flavor1 {
            ...
        }
        flavor2 {
            proguardFile 'flavor2-rules.pro'
        }
    }
}

Additional resources