Android Checkstyles

check.gradle

// Checkstyle
apply plugin: 'checkstyle'
checkstyle {
  showViolations true
  configFile = rootProject.file('codequality/checkstyle.xml')
}
def isLibraryPlugin = project.plugins.findPlugin('android-library') != null

def setupCheck = { variant ->
  def name = variant.buildType.name

  def checkstyle = project.tasks.create "checkstyle${name.capitalize()}", Checkstyle
  checkstyle.dependsOn variant.javaCompile
  checkstyle.source variant.javaCompile.source
  checkstyle.classpath = project.fileTree(variant.javaCompile.destinationDir)
  checkstyle.exclude('**/BuildConfig.java')
  checkstyle.exclude('**/R.java')
  project.tasks.getByName("check").dependsOn checkstyle
}

if (isLibraryPlugin) {
  android.libraryVariants.all { variant -> setupCheck(variant) }
} else {
  android.applicationVariants.all { variant -> setupCheck(variant) }
}