Use isVisible and isGone extensions for View.

app/src/main/java/org/schabi/newpipe/local/feed/FeedFragment.kt

@@ -30,6 +30,7 @@ import android.view.View
 import android.view.ViewGroup
 import androidx.appcompat.app.AlertDialog
 import androidx.core.os.bundleOf
+import androidx.core.view.isVisible
 import androidx.lifecycle.Observer
 import androidx.lifecycle.ViewModelProvider
 import androidx.preference.PreferenceManager
@@ -254,11 +255,9 @@ class FeedFragment : BaseListFragment<FeedState, Unit>() {
 
         oldestSubscriptionUpdate = loadedState.oldestUpdate
 
+        refresh_subtitle_text.isVisible = loadedState.notLoadedCount > 0
         if (loadedState.notLoadedCount > 0) {
-            refresh_subtitle_text.visibility = View.VISIBLE
             refresh_subtitle_text.text = getString(R.string.feed_subscription_not_loaded_count, loadedState.notLoadedCount)
-        } else {
-            refresh_subtitle_text.visibility = View.GONE
         }
 
         if (loadedState.itemsErrors.isNotEmpty()) {

app/src/main/java/org/schabi/newpipe/local/subscription/dialog/FeedGroupDialog.kt

@@ -13,6 +13,8 @@ import android.view.inputmethod.InputMethodManager
 import android.widget.Toast
 import androidx.core.content.getSystemService
 import androidx.core.os.bundleOf
+import androidx.core.view.isGone
+import androidx.core.view.isVisible
 import androidx.fragment.app.DialogFragment
 import androidx.lifecycle.Observer
 import androidx.lifecycle.ViewModelProvider
@@ -415,21 +417,14 @@ class FeedGroupDialog : DialogFragment(), BackPressable {
             else -> android.R.string.ok
         })
 
-        delete_button.visibility = when {
+        delete_button.isGone = currentScreen != InitialScreen || groupId == NO_GROUP_SELECTED
-            currentScreen != InitialScreen -> View.GONE
-            groupId == NO_GROUP_SELECTED -> View.GONE
-            else -> View.VISIBLE
-        }
 
         hideKeyboard()
         hideSearch()
     }
 
     private fun View.onlyVisibleIn(vararg screens: ScreenState) {
-        visibility = when (currentScreen) {
+        isVisible = currentScreen in screens
-            in screens -> View.VISIBLE
-            else -> View.GONE
-        }
     }
 
     /*/​//////////////////////////////////////////////////////////////////////////

app/src/main/java/org/schabi/newpipe/local/subscription/item/HeaderWithMenuItem.kt

@@ -1,9 +1,8 @@
 package org.schabi.newpipe.local.subscription.item
 
-import android.view.View.GONE
 import android.view.View.OnClickListener
-import android.view.View.VISIBLE
 import androidx.annotation.DrawableRes
+import androidx.core.view.isVisible
 import com.xwray.groupie.kotlinandroidextensions.GroupieViewHolder
 import com.xwray.groupie.kotlinandroidextensions.Item
 import kotlinx.android.synthetic.main.header_with_menu_item.header_menu_item
@@ -47,6 +46,6 @@ class HeaderWithMenuItem(
     }
 
     private fun updateMenuItemVisibility(viewHolder: GroupieViewHolder) {
-        viewHolder.header_menu_item.visibility = if (showMenuItem) VISIBLE else GONE
+        viewHolder.header_menu_item.isVisible = showMenuItem
     }
 }

app/src/main/java/org/schabi/newpipe/local/subscription/item/PickerSubscriptionItem.kt

@@ -1,6 +1,7 @@
 package org.schabi.newpipe.local.subscription.item
 
 import android.view.View
+import androidx.core.view.isVisible
 import com.nostra13.universalimageloader.core.ImageLoader
 import com.xwray.groupie.kotlinandroidextensions.GroupieViewHolder
 import com.xwray.groupie.kotlinandroidextensions.Item
@@ -25,7 +26,7 @@ data class PickerSubscriptionItem(
                 viewHolder.thumbnail_view, ImageDisplayConstants.DISPLAY_AVATAR_OPTIONS)
 
         viewHolder.title_view.text = subscriptionEntity.name
-        viewHolder.selected_highlight.visibility = if (isSelected) View.VISIBLE else View.GONE
+        viewHolder.selected_highlight.isVisible = isSelected
     }
 
     override fun unbind(viewHolder: GroupieViewHolder) {