Gradle task to change a boolean in build config

Question

I would like to create a very simple task which change a boolean in my gradle config.

I work on an Android application which can be run with several profiles, and for each build a need to specify if in my code the app must fake the bluetooth or not.

My gradle (relevant code) :

def fakeBluetooth = "true"

buildTypes {
    debug {
        minifyEnabled false
        signingConfig android.signingConfigs.debug
        buildConfigField "boolean", "fakeBluetooth", fakeBluetooth
    }
    release {
        minifyEnabled true
        signingConfig android.signingConfigs.release
        buildConfigField "boolean", "fakeBluetooth", fakeBluetooth
    }
}

task noFakeBluetooth {
    fakeBluetooth = "false"
}

Example of use in my java code :

if (BuildConfig.fakeBluetooth) {
    processFictiveBluetoothService();
} else {
    // other case
}

Examples of use in command line :

./gradlew iDebug noFakeBluetooth

and

./gradlew iDebug

Problem : in both cases the value of fakeBluetooth is always "true" (with or without "noFakeBluetooth" in cmd line).

Answer 1

You can use project properties to pass the value:

buildTypes {
    debug {
        minifyEnabled false
        signingConfig android.signingConfigs.debug
        buildConfigField "boolean", "fakeBluetooth", fakeBluetooth()
    }
    release {
        minifyEnabled true
        signingConfig android.signingConfigs.release
        buildConfigField "boolean", "fakeBluetooth", fakeBluetooth()
    }
}

def fakeBluetooth() {
    def value = project.getProperties().get("fakeBluetooth")
    return value != null ? value : "true"
}

And then you can pass the property with:

./gradlew iDebug -PfakeBluetooth=true

Answer 2

This works

 android.defaultConfig.buildConfigField "String", "value", "1"