FragmentExtensions.kt

inline fun <reified T : Fragment> FragmentManager.replaceFragment(
  @IdRes containerViewId: Int,
  vararg param: Pair<String, Any?>,
  tag: String = T::class.java.simpleName
): T? {
  return findFragment() ?: T::class.java.newInstance().also { newFragment ->
    newFragment.arguments = bundleOf(*param)
    beginTransaction()
      .replace(containerViewId, newFragment, tag)
      .commitAllowStateLoss()
  }
}
 
inline fun <reified T : Fragment> FragmentManager.findFragment(
  tag: String = T::class.java.simpleName
): T? {
  return findFragmentByTag(tag) as? T
}

inline fun <reified T : Fragment> FragmentActivity.replaceFragment(
  @IdRes containerViewId: Int,
  vararg param: Pair<String, Any?>,
  tag: String = T::class.java.simpleName
): T? {
  return supportFragmentManager.replaceFragment(containerViewId, *param, tag = tag)
}

inline fun <reified T : Fragment> FragmentActivity.findFragment(
  tag: String = T::class.java.simpleName
): T? {
  return supportFragmentManager.findFragment(tag)
}

inline fun <reified T : Fragment> Fragment.replaceFragment(
  @IdRes containerViewId: Int,
  vararg param: Pair<String, Any?>,
  tag: String = T::class.java.simpleName
): T? {
  return childFragmentManager.replaceFragment(containerViewId, *param, tag = tag)
}

inline fun <reified T : Fragment> Fragment.findFragment(
  tag: String = T::class.java.simpleName
): T? {
  return childFragmentManager.findFragment(tag)
}

/**
companion object {
  private const val ARG_KEY1 = "key1"
  private const val ARG_KEY2 = "key2"
  
  fun show(
    fragmentManager: FragmentManager,
    @IdRes containerViewId: Int,
    value1: String,
    value2: String
  ): DestinationFragment? {
    return fragmentManager.replaceFragment(
        containerViewId,
        ARG_KEY1 to value1,
        ARG_KEY2 to value2
    )
  }
}
**/