Ignore particular buildType in Android Project

build.gradle

// Variant 1: For app or library project's build.gradle 
android {
  variantFilter {
    if (it.buildType.name.equals('debug')) {
      it.ignore = true
    }
  }
}

// Variant 2: For root build.gradle with applying only to library projects
// For example we use it for StorIO because we don't have debug-specific code
// It makes our build faster
allprojects {
  project.plugins.whenPluginAdded { plugin ->
    if ('com.android.build.gradle.LibraryPlugin'.equals(plugin.class.name)) {
      project.android.variantFilter {
        if (it.buildType.name.equals('debug')) {
          it.ignore = true
        }
      }
    }
  }
}

// Source: https://groups.google.com/forum/#!topic/adt-dev/1ffLwedWTXc
// https://twitter.com/artem_zin