use the initialization function for reloading the viewpager

app/src/main/kotlin/com/simplemobiletools/gallery/activities/ViewPagerActivity.kt

@@ -237,20 +237,12 @@ class ViewPagerActivity : SimpleActivity(), ViewPager.OnPageChangeListener, View
     }
 
     private fun reloadViewPager() {
-        val adapter = view_pager.adapter as MyPagerAdapter
-        val curPos = view_pager.currentItem
         mMedia = getMedia()
-
         if (isDirEmpty())
             return
 
         runOnUiThread {
-            adapter.updateItems(mMedia!!)
-
-            val newPos = Math.min(curPos, adapter.count)
-            view_pager.currentItem = newPos
-            updateActionbarTitle()
-            mPos = newPos
+            updatePagerItems()
         }
     }
 

app/src/main/kotlin/com/simplemobiletools/gallery/adapters/MyPagerAdapter.kt

@@ -55,10 +55,4 @@ class MyPagerAdapter(val activity: ViewPagerActivity, fm: FragmentManager, val m
         (-1..1).map { mFragments[pos + it] }
                 .forEach { it?.updateItem() }
     }
-
-    fun updateItems(newPaths: List<Medium>) {
-        media.clear()
-        media.addAll(newPaths)
-        notifyDataSetChanged()
-    }
 }