dont always recreate the list, just update the items

Author: tibbi

app/src/main/kotlin/com/simplemobiletools/filemanager/adapters/ItemsAdapter.kt

@@ -26,7 +26,7 @@ import kotlinx.android.synthetic.main.list_item.view.*
 import java.io.File
 import java.util.*
 
-class ItemsAdapter(val activity: SimpleActivity, val mItems: List<FileDirItem>, val listener: ItemOperationsListener?, val itemClick: (FileDirItem) -> Unit) :
+class ItemsAdapter(val activity: SimpleActivity, var mItems: List<FileDirItem>, val listener: ItemOperationsListener?, val itemClick: (FileDirItem) -> Unit) :
         RecyclerView.Adapter<ItemsAdapter.ViewHolder>() {
     val multiSelector = MultiSelector()
     val views = ArrayList<View>()
@@ -179,6 +179,11 @@ class ItemsAdapter(val activity: SimpleActivity, val mItems: List<FileDirItem>,
         return selectedMedia
     }
 
+    fun updateItems(newItems: List<FileDirItem>) {
+        mItems = newItems
+        notifyDataSetChanged()
+    }
+
     override fun onCreateViewHolder(parent: ViewGroup?, viewType: Int): ViewHolder {
         val view = LayoutInflater.from(parent?.context).inflate(R.layout.list_item, parent, false)
         return ViewHolder(activity, view, itemClick)

app/src/main/kotlin/com/simplemobiletools/filemanager/fragments/ItemsFragment.kt

@@ -76,10 +76,16 @@ class ItemsFragment : android.support.v4.app.Fragment(), ItemsAdapter.ItemOperat
         val adapter = ItemsAdapter(activity as SimpleActivity, mItems, this) {
             itemClicked(it)
         }
-        items_list.apply {
-            this@apply.adapter = adapter
-            addItemDecoration(RecyclerViewDivider(context))
-            setOnTouchListener { view, motionEvent -> checkDelete(); false }
+
+        val currAdapter = items_list.adapter
+        if (currAdapter == null) {
+            items_list.apply {
+                this@apply.adapter = adapter
+                addItemDecoration(RecyclerViewDivider(context))
+                setOnTouchListener { view, motionEvent -> checkDelete(); false }
+            }
+        } else {
+            (currAdapter as ItemsAdapter).updateItems(mItems)
         }
     }