add a menu button for adding included folders

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

@@ -1,11 +1,34 @@
 package com.simplemobiletools.gallery.activities
 
 import android.os.Bundle
+import android.view.Menu
+import android.view.MenuItem
+import com.simplemobiletools.commons.dialogs.FilePickerDialog
 import com.simplemobiletools.gallery.R
+import com.simplemobiletools.gallery.extensions.config
 
 class IncludedFoldersActivity : SimpleActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_included_folders)
     }
+
+    override fun onCreateOptionsMenu(menu: Menu?): Boolean {
+        menuInflater.inflate(R.menu.menu_included_folders, menu)
+        return true
+    }
+
+    override fun onOptionsItemSelected(item: MenuItem): Boolean {
+        when (item.itemId) {
+            R.id.add_folder -> addIncludedFolder()
+            else -> return super.onOptionsItemSelected(item)
+        }
+        return true
+    }
+
+    private fun addIncludedFolder() {
+        FilePickerDialog(this, pickFile = false, showHidden = config.showHiddenFolders) {
+            config.addIncludedFolder(it)
+        }
+    }
 }

app/src/main/kotlin/com/simplemobiletools/gallery/helpers/Config.kt

@@ -78,14 +78,26 @@ class Config(context: Context) : BaseConfig(context) {
         excludedFolders = currExcludedFolders
     }
 
-    fun removeAllExcludedFolders() {
-        prefs.edit().remove(EXCLUDED_FOLDERS).apply()
-    }
-
     var excludedFolders: MutableSet<String>
         get() = prefs.getStringSet(EXCLUDED_FOLDERS, HashSet<String>())
         set(excludedFolders) = prefs.edit().remove(EXCLUDED_FOLDERS).putStringSet(EXCLUDED_FOLDERS, excludedFolders).apply()
 
+    fun addIncludedFolder(path: String) {
+        val currIncludedFolders = HashSet<String>(includedFolders)
+        currIncludedFolders.add(path)
+        includedFolders = currIncludedFolders
+    }
+
+    fun removeIncludedFolder(path: String) {
+        val currIncludedFolders = HashSet<String>(includedFolders)
+        currIncludedFolders.remove(path)
+        includedFolders = currIncludedFolders
+    }
+
+    var includedFolders: MutableSet<String>
+        get() = prefs.getStringSet(INCLUDED_FOLDERS, HashSet<String>())
+        set(includedFolders) = prefs.edit().remove(INCLUDED_FOLDERS).putStringSet(INCLUDED_FOLDERS, includedFolders).apply()
+
     fun saveFolderMedia(path: String, json: String) {
         prefs.edit().putString(SAVE_FOLDER_PREFIX + path, json).apply()
     }

app/src/main/kotlin/com/simplemobiletools/gallery/helpers/Constants.kt

@@ -18,6 +18,7 @@ val SHOW_MEDIA = "show_media"
 val SAVE_FOLDER_PREFIX = "folder_"
 val HIDE_FOLDER_TOOLTIP_SHOWN = "hide_folder_tooltip_shown"
 val EXCLUDED_FOLDERS = "excluded_folders"
+val INCLUDED_FOLDERS = "included_folders"
 
 val NOMEDIA = ".nomedia"
 

app/src/main/res/menu/menu_included_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/add_folder"
+        android:icon="@drawable/ic_plus"
+        android:title="@string/add_folder"
+        app:showAsAction="ifRoom"/>
+</menu>