buildConfigField depending on flavor + buildType

Question

I\'m trying to define a buildConfigVariable depending on the flavor + buildType. Ideally, this is what I want

productFlavors {
            


        

Answer 1

Warning: this might be a fragile solution, use at your own risk. See https://code.google.com/p/android/issues/detail?id=67416

This is how I accomplished what I wanted. You need to change the values just before the task is executed, so I needed a way to hook my code in there.

final projectName = project.name
gradle.taskGraph.beforeTask { Task task ->
    if (task.path ==~ /:$projectName:generate.*BuildConfig/) {
        //extracts flavor and buildType name. See http://stackoverflow.com/a/7594052/218473 for regex
        final values = task.name.replace("generate","").replace("BuildConfig","").split("(?
            if (currentVariant.getVariantData().getVariantConfiguration().getBuildType().getName() == buildTypeName) {
                if (currentVariant.getVariantData().getVariantConfiguration().getFlavorName() == flavorName) {
                    variant = currentVariant;
                }
            }
        }

        if(variant != null) {
            com.android.builder.internal.ClassFieldImpl apiKeyField
            if (flavorName == 'strawberry') {    
                if (buildTypeName == 'release') {
                    apiKeyField = new com.android.builder.internal.ClassFieldImpl("String", "WS_API_KEY", '"strawberry_release"')
                } else {
                    apiKeyField = new com.android.builder.internal.ClassFieldImpl("String", "WS_API_KEY", '"strawberry_debug"')
                }
            } else if (flavorName == 'chocolate') {                        
                if (buildTypeName == 'release') {
                    apiKeyField = new com.android.builder.internal.ClassFieldImpl("String", "WS_API_KEY", '"chocolate_release"')
                } else {
                    apiKeyField = new com.android.builder.internal.ClassFieldImpl("String", "WS_API_KEY", '"chocolate_debug"')
                }
            }

            variant.getVariantData().getVariantConfiguration().getFlavorConfigs().get(0).addBuildConfigField(apiKeyField)
        }
    }
}

To understand why this works, download the AOSP source code and check VariantConfiguration.getBuildConfigItems()

Using Xavier's answer throws a MethodMissingError. If I use variant.mergedFlavor.addBuildConfigField() there's no error, but the variable isn't added.