allow selecting Cover photo from any folder

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

@@ -215,10 +215,11 @@ class DirectoryAdapter(val activity: SimpleActivity, var dirs: MutableList<Direc
     }
 
     private fun pinFolders(pin: Boolean) {
-        if (pin)
+        if (pin) {
             config.addPinnedFolders(getSelectedPaths())
-        else
+        } else {
             config.removePinnedFolders(getSelectedPaths())
+        }
 
         pinnedFolders = config.pinnedFolders
         listener?.recheckPinnedFolders()
@@ -302,20 +303,30 @@ class DirectoryAdapter(val activity: SimpleActivity, var dirs: MutableList<Direc
             return
 
         val path = dirs[selectedPositions.first()].path
-        var albumCovers = config.parseAlbumCovers()
 
         if (useDefault) {
-            albumCovers = albumCovers.filterNot { it.path == path } as ArrayList
+            val albumCovers = getAlbumCoversWithout(path)
             storeCovers(albumCovers)
         } else {
+            pickMediumFrom(path, path)
+        }
+    }
+
+    private fun pickMediumFrom(targetFolder: String, path: String) {
         PickMediumDialog(activity, path) {
-                albumCovers = albumCovers.filterNot { it.path == path } as ArrayList
+            if (File(it).isDirectory) {
-                albumCovers.add(AlbumCover(path, it))
+                pickMediumFrom(targetFolder, it)
+            } else {
+                val albumCovers = getAlbumCoversWithout(path)
+                val cover = AlbumCover(targetFolder, it)
+                albumCovers.add(cover)
                 storeCovers(albumCovers)
             }
         }
     }
 
+    private fun getAlbumCoversWithout(path: String) = config.parseAlbumCovers().filterNot { it.path == path } as ArrayList
+
     private fun storeCovers(albumCovers: ArrayList<AlbumCover>) {
         activity.config.albumCovers = Gson().toJson(albumCovers)
         actMode?.finish()

app/src/main/kotlin/com/simplemobiletools/gallery/dialogs/PickDirectoryDialog.kt

@@ -37,6 +37,7 @@ class PickDirectoryDialog(val activity: SimpleActivity, val sourcePath: String,
                 .setNeutralButton(R.string.other_folder, { dialogInterface, i -> showOtherFolder() })
                 .create().apply {
             activity.setupDialogStuff(view, this, R.string.select_destination)
+        }
 
         val dirs = activity.getCachedDirectories()
         if (dirs.isNotEmpty()) {
@@ -47,7 +48,6 @@ class PickDirectoryDialog(val activity: SimpleActivity, val sourcePath: String,
             gotDirectories(activity.addTempFolderIfNeeded(it))
         }.execute()
     }
-    }
 
     private fun showOtherFolder() {
         val showHidden = activity.config.shouldShowHidden

app/src/main/kotlin/com/simplemobiletools/gallery/dialogs/PickMediumDialog.kt

@@ -31,8 +31,10 @@ class PickMediumDialog(val activity: SimpleActivity, val path: String, val callb
         dialog = AlertDialog.Builder(activity)
                 .setPositiveButton(R.string.ok, null)
                 .setNegativeButton(R.string.cancel, null)
+                .setNeutralButton(R.string.other_folder, { dialogInterface, i -> showOtherFolder() })
                 .create().apply {
             activity.setupDialogStuff(view, this, R.string.select_photo)
+        }
 
         val media = activity.getCachedMedia(path).filter { !it.video } as ArrayList
         if (media.isNotEmpty()) {
@@ -43,6 +45,12 @@ class PickMediumDialog(val activity: SimpleActivity, val path: String, val callb
             gotMedia(it)
         }.execute()
     }
+
+    private fun showOtherFolder() {
+        PickDirectoryDialog(activity, path) {
+            callback(it)
+            dialog.dismiss()
+        }
     }
 
     private fun gotMedia(media: ArrayList<Medium>) {