add a menu button for temporarily showing hidden items

app/build.gradle

@@ -32,7 +32,7 @@ android {
 }
 
 dependencies {
-    compile 'com.simplemobiletools:commons:2.21.10'
+    compile 'com.simplemobiletools:commons:2.21.11'
     compile 'com.bignerdranch.android:recyclerview-multiselect:0.2'
     compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
 }

app/src/main/kotlin/com/simplemobiletools/filemanager/Config.kt

@@ -16,6 +16,12 @@ class Config(context: Context) : BaseConfig(context) {
         get() = prefs.getBoolean(SHOW_HIDDEN, false)
         set(show) = prefs.edit().putBoolean(SHOW_HIDDEN, show).apply()
 
+    var temporarilyShowHidden: Boolean
+        get() = prefs.getBoolean(TEMPORARILY_SHOW_HIDDEN, false)
+        set(temporarilyShowHidden) = prefs.edit().putBoolean(TEMPORARILY_SHOW_HIDDEN, temporarilyShowHidden).apply()
+
+    var shouldShowHidden = showHidden || temporarilyShowHidden
+
     var homeFolder: String
         get(): String {
             var home = prefs.getString(HOME_FOLDER, "")

app/src/main/kotlin/com/simplemobiletools/filemanager/Constants.kt

@@ -9,3 +9,4 @@ val HOME_FOLDER = "home_folder"
 val FAVORITES = "favorites"
 val SORT_ORDER = "sort_order"
 val SORT_FOLDER_PREFIX = "sort_folder_"
+val TEMPORARILY_SHOW_HIDDEN = "temporarily_show_hidden"

app/src/main/kotlin/com/simplemobiletools/filemanager/activities/FavoritesActivity.kt

@@ -56,7 +56,7 @@ class FavoritesActivity : SimpleActivity() {
     }
 
     private fun addFavorite() {
-        FilePickerDialog(this, pickFile = false, showHidden = config.showHidden) {
+        FilePickerDialog(this, pickFile = false, showHidden = config.shouldShowHidden) {
             config.addFavorite(it)
             updateFavorites()
         }

app/src/main/kotlin/com/simplemobiletools/filemanager/activities/MainActivity.kt

@@ -66,6 +66,11 @@ class MainActivity : SimpleActivity(), ItemsFragment.ItemInteractionListener, Br
         mStoredTextColor = config.textColor
     }
 
+    override fun onDestroy() {
+        super.onDestroy()
+        config.temporarilyShowHidden = false
+    }
+
     private fun tryInitFileManager() {
         if (hasWriteStoragePermission()) {
             initRootFileManager()
@@ -109,6 +114,7 @@ class MainActivity : SimpleActivity(), ItemsFragment.ItemInteractionListener, Br
             findItem(R.id.add_favorite).isVisible = !favorites.contains(currentPath)
             findItem(R.id.remove_favorite).isVisible = favorites.contains(currentPath)
             findItem(R.id.go_to_favorite).isVisible = favorites.isNotEmpty()
+            menu.findItem(R.id.temporarily_show_hidden).isVisible = !config.showHidden
         }
 
         return true
@@ -122,6 +128,7 @@ class MainActivity : SimpleActivity(), ItemsFragment.ItemInteractionListener, Br
             R.id.remove_favorite -> removeFavorite()
             R.id.go_to_favorite -> goToFavorite()
             R.id.set_as_home -> setAsHome()
+            R.id.temporarily_show_hidden -> temporarilyShowHidden()
             R.id.settings -> startActivity(Intent(this, SettingsActivity::class.java))
             R.id.about -> launchAbout()
             else -> return super.onOptionsItemSelected(item)
@@ -176,6 +183,11 @@ class MainActivity : SimpleActivity(), ItemsFragment.ItemInteractionListener, Br
         toast(R.string.home_folder_updated)
     }
 
+    private fun temporarilyShowHidden() {
+        config.temporarilyShowHidden = true
+        openPath(currentPath)
+    }
+
     private fun launchAbout() {
         startAboutActivity(R.string.app_name, LICENSE_KOTLIN or LICENSE_MULTISELECT, BuildConfig.VERSION_NAME)
     }

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

@@ -125,11 +125,11 @@ class ItemsAdapter(val activity: SimpleActivity, var mItems: MutableList<FileDir
 
     private fun showProperties() {
         if (selectedPositions.size <= 1) {
-            PropertiesDialog(activity, mItems[selectedPositions.first()].path, config.showHidden)
+            PropertiesDialog(activity, mItems[selectedPositions.first()].path, config.shouldShowHidden)
         } else {
             val paths = ArrayList<String>()
             selectedPositions.forEach { paths.add(mItems[it].path) }
-            PropertiesDialog(activity, paths, config.showHidden)
+            PropertiesDialog(activity, paths, config.shouldShowHidden)
         }
     }
 
@@ -157,7 +157,7 @@ class ItemsAdapter(val activity: SimpleActivity, var mItems: MutableList<FileDir
 
     private fun addFileUris(file: File, uris: ArrayList<Uri>) {
         if (file.isDirectory) {
-            file.listFiles()?.filter { if (config.showHidden) true else !it.isHidden }?.forEach {
+            file.listFiles()?.filter { if (config.shouldShowHidden) true else !it.isHidden }?.forEach {
                 addFileUris(it, uris)
             }
         } else {
@@ -183,7 +183,7 @@ class ItemsAdapter(val activity: SimpleActivity, var mItems: MutableList<FileDir
         selectedPositions.forEach { files.add(File(mItems[it].path)) }
 
         val source = if (files[0].isFile) files[0].parent else files[0].absolutePath
-        FilePickerDialog(activity, source, false, config.showHidden, true) {
+        FilePickerDialog(activity, source, false, config.shouldShowHidden, true) {
             activity.copyMoveFilesTo(files, source, it, isCopyOperation, false) {
                 if (!isCopyOperation) {
                     listener?.refreshItems()

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

@@ -44,7 +44,7 @@ class ItemsFragment : Fragment(), ItemsAdapter.ItemOperationsListener {
 
     override fun onViewCreated(view: View?, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
-        mShowHidden = context.config.showHidden
+        mShowHidden = context.config.shouldShowHidden
         fillItems()
 
         items_swipe_refresh.setOnRefreshListener({ fillItems() })
@@ -54,7 +54,7 @@ class ItemsFragment : Fragment(), ItemsAdapter.ItemOperationsListener {
     override fun onResume() {
         super.onResume()
         val config = context.config
-        if (mShowHidden != config.showHidden) {
+        if (mShowHidden != config.shouldShowHidden) {
             mShowHidden = !mShowHidden
             fillItems()
         }

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

@@ -29,6 +29,10 @@
         android:id="@+id/set_as_home"
         android:title="@string/set_as_home_folder"
         app:showAsAction="never"/>
+    <item
+        android:id="@+id/temporarily_show_hidden"
+        android:title="@string/temporarily_show_hidden"
+        app:showAsAction="never"/>
     <item
         android:id="@+id/settings"
         android:title="@string/settings"