Helpful FragmentManager extension functions

FragmentManagerExtensions

/**
 * Invokes func body in a fragment transaction
 *
 * @allowStateLoss - a flag which determines whether to use #commitAllowingStateLoss or #commit. See {@link FragmentTransaction#commitAllowingStateLoss}
 * @func - a body which is invoked inside a fragment transaction
 */
inline fun FragmentManager.inTransaction(
    allowStateLoss: Boolean = false,
    func: FragmentTransaction.() -> Unit
) {
  val transaction = beginTransaction()
  transaction.func()
  if (allowStateLoss) {
    transaction.commitAllowingStateLoss()
  } else {
    transaction.commit()
  }
}

/**
 * Returns the top fragment of the current FragmentManager
 * 
 * @return - a Fragment that is located on top of the FragmentManager
 */
fun FragmentManager.getCurrentFragment(): Fragment? {
  var fragmentTag: String? = ""
  if (backStackEntryCount > 0)
    fragmentTag = getBackStackEntryAt(backStackEntryCount - 1).name
  return findFragmentByTag(fragmentTag)
}