implement the hidden folder adapter for adding/removing items

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

@@ -7,6 +7,8 @@ import com.simplemobiletools.commons.dialogs.FilePickerDialog
 import com.simplemobiletools.commons.extensions.beVisibleIf
 import com.simplemobiletools.commons.interfaces.RefreshRecyclerViewListener
 import com.simplemobiletools.gallery.R
+import com.simplemobiletools.gallery.adapters.ManageHiddenFoldersAdapter
+import com.simplemobiletools.gallery.extensions.addNoMedia
 import com.simplemobiletools.gallery.extensions.config
 import com.simplemobiletools.gallery.extensions.getNoMediaFolders
 import kotlinx.android.synthetic.main.activity_manage_folders.*
@@ -25,6 +27,10 @@ class HiddenFoldersActivity : SimpleActivity(), RefreshRecyclerViewListener {
             beVisibleIf(folders.isEmpty())
             setTextColor(config.textColor)
         }
+
+        val adapter = ManageHiddenFoldersAdapter(this, folders, this, manage_folders_list) {}
+        adapter.setupDragListener(true)
+        manage_folders_list.adapter = adapter
     }
 
     override fun onCreateOptionsMenu(menu: Menu?): Boolean {
@@ -46,7 +52,11 @@ class HiddenFoldersActivity : SimpleActivity(), RefreshRecyclerViewListener {
 
     private fun addFolder() {
         FilePickerDialog(this, pickFile = false, showHidden = config.shouldShowHidden) {
-
+            Thread {
+                addNoMedia(it) {
+                    updateFolders()
+                }
+            }.start()
         }
     }
 }

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

@@ -0,0 +1,94 @@
+package com.simplemobiletools.gallery.adapters
+
+import android.view.Menu
+import android.view.View
+import android.view.ViewGroup
+import com.simplemobiletools.commons.activities.BaseSimpleActivity
+import com.simplemobiletools.commons.adapters.MyRecyclerViewAdapter
+import com.simplemobiletools.commons.extensions.isPathOnSD
+import com.simplemobiletools.commons.interfaces.RefreshRecyclerViewListener
+import com.simplemobiletools.commons.views.MyRecyclerView
+import com.simplemobiletools.gallery.R
+import com.simplemobiletools.gallery.extensions.config
+import com.simplemobiletools.gallery.extensions.removeNoMedia
+import kotlinx.android.synthetic.main.item_manage_folder.view.*
+import java.io.File
+import java.util.*
+
+class ManageHiddenFoldersAdapter(activity: BaseSimpleActivity, var folders: ArrayList<String>, val listener: RefreshRecyclerViewListener?,
+                                 recyclerView: MyRecyclerView, itemClick: (Any) -> Unit) : MyRecyclerViewAdapter(activity, recyclerView, itemClick) {
+
+    private val config = activity.config
+
+    override fun getActionMenuId() = R.menu.cab_hidden_folders
+
+    override fun prepareActionMode(menu: Menu) {}
+
+    override fun prepareItemSelection(view: View) {}
+
+    override fun markItemSelection(select: Boolean, view: View?) {
+        view?.manage_folder_holder?.isSelected = select
+    }
+
+    override fun actionItemPressed(id: Int) {
+        when (id) {
+            R.id.cab_unhide -> tryUnhideFolders()
+        }
+    }
+
+    override fun getSelectableItemCount() = folders.size
+
+    override fun onCreateViewHolder(parent: ViewGroup?, viewType: Int) = createViewHolder(R.layout.item_manage_folder, parent)
+
+    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
+        val folder = folders[position]
+        val view = holder.bindView(folder) { itemView, layoutPosition ->
+            setupView(itemView, folder)
+        }
+        bindViewHolder(holder, position, view)
+    }
+
+    override fun getItemCount() = folders.size
+
+    private fun setupView(view: View, folder: String) {
+        view.apply {
+            manage_folder_title.apply {
+                text = folder
+                setTextColor(config.textColor)
+            }
+        }
+    }
+
+    private fun tryUnhideFolders() {
+        val removeFolders = ArrayList<String>(selectedPositions.size)
+
+        val sdCardPaths = ArrayList<String>()
+        selectedPositions.forEach {
+            if (activity.isPathOnSD(folders[it])) {
+                sdCardPaths.add(folders[it])
+            }
+        }
+
+        if (sdCardPaths.isNotEmpty()) {
+            activity.handleSAFDialog(File(sdCardPaths.first())) {
+                unhideFolders(removeFolders)
+            }
+        } else {
+            unhideFolders(removeFolders)
+        }
+    }
+
+    private fun unhideFolders(removeFolders: ArrayList<String>) {
+        selectedPositions.sortedDescending().forEach {
+            val folder = folders[it]
+            removeFolders.add(folder)
+            activity.removeNoMedia(folder)
+        }
+
+        folders.removeAll(removeFolders)
+        removeSelectedItems()
+        if (folders.isEmpty()) {
+            listener?.refreshItems()
+        }
+    }
+}

app/src/main/res/menu/cab_hidden_folders.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+      xmlns:app="http://schemas.android.com/apk/res-auto">
+    <item
+        android:id="@+id/cab_unhide"
+        android:icon="@drawable/ic_unhide"
+        android:title="@string/unhide"
+        app:showAsAction="ifRoom"/>
+</menu>