add a couple things related to displaying all media at once

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

@@ -81,6 +81,10 @@ class MainActivity : SimpleActivity(), DirectoryAdapter.DirOperationsListener {
                 startActivity(Intent(MediaStore.INTENT_ACTION_STILL_IMAGE_CAMERA))
                 true
             }
+            R.id.show_all -> {
+                showAllMedia()
+                true
+            }
             R.id.settings -> {
                 startActivity(Intent(applicationContext, SettingsActivity::class.java))
                 true
@@ -145,6 +149,14 @@ class MainActivity : SimpleActivity(), DirectoryAdapter.DirOperationsListener {
         }
     }
 
+    private fun showAllMedia() {
+        Intent(this, MediaActivity::class.java).apply {
+            putExtra(DIRECTORY, "/")
+            putExtra(SHOW_ALL, true)
+            startActivity(this)
+        }
+    }
+
     override fun prepareForDeleting(paths: ArrayList<String>) {
         toast(R.string.deleting)
         mToBeDeleted = paths

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

@@ -42,6 +42,7 @@ class MediaActivity : SimpleActivity(), MediaAdapter.MediaOperationsListener {
         private var mIsGetVideoIntent = false
         private var mIsGetAnyIntent = false
         private var mIsGettingMedia = false
+        private var mShowAll = false
     }
 
     override fun onCreate(savedInstanceState: Bundle?) {
@@ -56,6 +57,7 @@ class MediaActivity : SimpleActivity(), MediaAdapter.MediaOperationsListener {
         media_holder.setOnRefreshListener({ getMedia() })
         mPath = intent.getStringExtra(DIRECTORY)
         mMedia = ArrayList<Medium>()
+        mShowAll = intent.getBooleanExtra(SHOW_ALL, false)
     }
 
     override fun onResume() {
@@ -71,7 +73,7 @@ class MediaActivity : SimpleActivity(), MediaAdapter.MediaOperationsListener {
     private fun tryloadGallery() {
         if (hasStoragePermission()) {
             val dirName = getHumanizedFilename(mPath)
-            title = dirName
+            title = if (mShowAll) resources.getString(R.string.all_media) else dirName
             getMedia()
         } else {
             finish()
@@ -99,8 +101,8 @@ class MediaActivity : SimpleActivity(), MediaAdapter.MediaOperationsListener {
         menuInflater.inflate(R.menu.menu_media, menu)
 
         val isFolderHidden = mConfig.getIsFolderHidden(mPath)
-        menu.findItem(R.id.hide_folder).isVisible = !isFolderHidden
+        menu.findItem(R.id.hide_folder).isVisible = !isFolderHidden && !mShowAll
-        menu.findItem(R.id.unhide_folder).isVisible = isFolderHidden
+        menu.findItem(R.id.unhide_folder).isVisible = isFolderHidden && !mShowAll
         return true
     }
 
@@ -128,7 +130,8 @@ class MediaActivity : SimpleActivity(), MediaAdapter.MediaOperationsListener {
 
     private fun toggleFilenameVisibility() {
         mConfig.displayFileNames = !mConfig.displayFileNames
-        (media_grid.adapter as MediaAdapter).updateDisplayFilenames(mConfig.displayFileNames)
+        if (media_grid.adapter != null)
+            (media_grid.adapter as MediaAdapter).updateDisplayFilenames(mConfig.displayFileNames)
     }
 
     private fun showSortingDialog() {

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

@@ -26,6 +26,7 @@ val SORT_DESCENDING = 1024
 val OPEN_DOCUMENT_TREE = 1000
 
 val DIRECTORY = "directory"
+val SHOW_ALL = "show_all"
 val MEDIUM = "medium"
 val GET_IMAGE_INTENT = "get_image_intent"
 val GET_VIDEO_INTENT = "get_video_intent"

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

@@ -11,6 +11,10 @@
         android:icon="@mipmap/camera"
         android:title="@string/open_camera"
         app:showAsAction="ifRoom"/>
+    <item
+        android:id="@+id/show_all"
+        android:title="@string/show_all"
+        app:showAsAction="never"/>
     <item
         android:id="@+id/settings"
         android:title="@string/settings"

app/src/main/res/values-de/strings.xml

@@ -46,6 +46,8 @@
     <string name="moving_success_partial">Some files could not be moved</string>
     <string name="copying_success_partial">Some files could not be copied</string>
     <string name="invalid_name">Der Name enthält nicht erlaubte Zeichen</string>
+    <string name="show_all">Show all media files</string>
+    <string name="all_media">All media</string>
 
     <plurals name="folders_deleted">
         <item quantity="one">1 Ordner gelöscht</item>

app/src/main/res/values-es/strings.xml

@@ -46,6 +46,8 @@
     <string name="moving_success_partial">Some files could not be moved</string>
     <string name="copying_success_partial">Some files could not be copied</string>
     <string name="invalid_name">The name contains invalid characters</string>
+    <string name="show_all">Show all media files</string>
+    <string name="all_media">All media</string>
 
     <plurals name="folders_deleted">
         <item quantity="one">1 carpeta eliminada</item>

app/src/main/res/values-it/strings.xml

@@ -46,6 +46,8 @@
     <string name="moving_success_partial">Alcuni file non possono essere spostati</string>
     <string name="copying_success_partial">Alcuni file non possono essere copiati</string>
     <string name="invalid_name">Il nome contiene caratteri non validi</string>
+    <string name="show_all">Show all media files</string>
+    <string name="all_media">All media</string>
 
     <plurals name="folders_deleted">
         <item quantity="one">1 cartella eliminata</item>

app/src/main/res/values-ja/strings.xml

@@ -46,6 +46,8 @@
     <string name="moving_success_partial">一部のファイルが移動できませんでした</string>
     <string name="copying_success_partial">一部のファイルがコピーできませんでした</string>
     <string name="invalid_name">名前に無効な文字が含まれています</string>
+    <string name="show_all">Show all media files</string>
+    <string name="all_media">All media</string>
 
     <plurals name="folders_deleted">
         <item quantity="one">1 フォルダーを削除しました</item>

app/src/main/res/values-pt-rPT/strings.xml

@@ -46,6 +46,8 @@
     <string name="moving_success_partial">Alguns ficheiros não foram movidos</string>
     <string name="copying_success_partial">Alguns ficheiros não foram copiados</string>
     <string name="invalid_name">O nome contém caracteres inválidos</string>
+    <string name="show_all">Show all media files</string>
+    <string name="all_media">All media</string>
 
     <plurals name="folders_deleted">
         <item quantity="one">1 pasta apagada</item>

app/src/main/res/values-ru/strings.xml

@@ -47,6 +47,8 @@
     <string name="moving_success_partial">Некоторые файлы не могут быть перемещены</string>
     <string name="copying_success_partial">Некоторые файлы не могут быть скопированы</string>
     <string name="invalid_name">Имя содержит недопустимые символы</string>
+    <string name="show_all">Show all media files</string>
+    <string name="all_media">All media</string>
 
     <plurals name="folders_deleted">
         <item quantity="one">1 папка удалена</item>

app/src/main/res/values-sv/strings.xml

@@ -46,6 +46,8 @@
     <string name="moving_success_partial">Some files could not be moved</string>
     <string name="copying_success_partial">Some files could not be copied</string>
     <string name="invalid_name">Namnet innehåller ogiltiga tecken</string>
+    <string name="show_all">Show all media files</string>
+    <string name="all_media">All media</string>
 
     <plurals name="folders_deleted">
         <item quantity="one">1 mapp borttagen</item>

app/src/main/res/values-zh/strings.xml

@@ -47,6 +47,8 @@
     <string name="moving_success_partial">相同文件不能移动</string>
     <string name="copying_success_partial">相同文件不能复制</string>
     <string name="invalid_name">The name contains invalid characters</string>
+    <string name="show_all">Show all media files</string>
+    <string name="all_media">All media</string>
 
     <plurals name="folders_deleted">
         <item quantity="one">1 folder deleted</item>

app/src/main/res/values/strings.xml

@@ -46,6 +46,8 @@
     <string name="moving_success_partial">Some files could not be moved</string>
     <string name="copying_success_partial">Some files could not be copied</string>
     <string name="invalid_name">The name contains invalid characters</string>
+    <string name="show_all">Show all media files</string>
+    <string name="all_media">All media</string>
 
     <plurals name="folders_deleted">
         <item quantity="one">1 folder deleted</item>