diff --git a/app/src/main/java/com/nextcloud/client/jobs/MediaFoldersDetectionWork.kt b/app/src/main/java/com/nextcloud/client/jobs/MediaFoldersDetectionWork.kt
index b647b58010..47e653e577 100644
--- a/app/src/main/java/com/nextcloud/client/jobs/MediaFoldersDetectionWork.kt
+++ b/app/src/main/java/com/nextcloud/client/jobs/MediaFoldersDetectionWork.kt
@@ -105,12 +105,19 @@ class MediaFoldersDetectionWork constructor(
         )
         val imageMediaFolderPaths: MutableList<String> = ArrayList()
         val videoMediaFolderPaths: MutableList<String> = ArrayList()
+
         for (imageMediaFolder in imageMediaFolders) {
-            imageMediaFolderPaths.add(imageMediaFolder.absolutePath)
+            imageMediaFolder.absolutePath?.let {
+                imageMediaFolderPaths.add(it)
+            }
         }
+
         for (videoMediaFolder in videoMediaFolders) {
-            imageMediaFolderPaths.add(videoMediaFolder.absolutePath)
+            videoMediaFolder.absolutePath?.let {
+                imageMediaFolderPaths.add(it)
+            }
         }
+
         val arbitraryDataString = arbitraryDataProvider.getValue(ACCOUNT_NAME_GLOBAL, KEY_MEDIA_FOLDERS)
         if (!TextUtils.isEmpty(arbitraryDataString)) {
             mediaFoldersModel = gson.fromJson(arbitraryDataString, MediaFoldersModel::class.java)
diff --git a/app/src/main/java/com/owncloud/android/datamodel/MediaFolder.kt b/app/src/main/java/com/owncloud/android/datamodel/MediaFolder.kt
index b2655e0b55..5a7da2d20b 100644
--- a/app/src/main/java/com/owncloud/android/datamodel/MediaFolder.kt
+++ b/app/src/main/java/com/owncloud/android/datamodel/MediaFolder.kt
@@ -16,29 +16,31 @@
  * GNU AFFERO GENERAL PUBLIC LICENSE for more details.
  *
  * You should have received a copy of the GNU Affero General Public
- * License along with this program. If not, see <http://www.gnu.org/licenses/>.
+ * License along with this program. If not, see <http:></http:>//www.gnu.org/licenses/>.
  */
-package com.owncloud.android.datamodel;
-
-import java.util.ArrayList;
-import java.util.List;
+package com.owncloud.android.datamodel
 
 /**
  * Business object representing a media folder with all information that are gathered via media queries.
  */
-public class MediaFolder {
-    /** name of the folder. */
-    public String folderName;
+class MediaFolder {
+    /** name of the folder.  */
+    @JvmField
+    var folderName: String? = null
 
-    /** absolute path of the folder. */
-    public String absolutePath;
-    
-    /** list of file paths of the folder's content */
-    public List<String> filePaths = new ArrayList<>();
+    /** absolute path of the folder.  */
+    @JvmField
+    var absolutePath: String? = null
 
-    /** total number of files in the media folder. */
-    public long numberOfFiles;
+    /** list of file paths of the folder's content  */
+    @JvmField
+    var filePaths: List<String> = ArrayList()
 
-    /** type of media folder. */
-    public MediaFolderType type;
+    /** total number of files in the media folder.  */
+    @JvmField
+    var numberOfFiles: Long = 0
+
+    /** type of media folder.  */
+    @JvmField
+    var type: MediaFolderType? = null
 }
diff --git a/app/src/main/java/com/owncloud/android/datamodel/MediaFolderType.kt b/app/src/main/java/com/owncloud/android/datamodel/MediaFolderType.kt
index efd3cf9774..c89ea65927 100644
--- a/app/src/main/java/com/owncloud/android/datamodel/MediaFolderType.kt
+++ b/app/src/main/java/com/owncloud/android/datamodel/MediaFolderType.kt
@@ -17,37 +17,28 @@
  * You should have received a copy of the GNU Affero General Public
  * License along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
-package com.owncloud.android.datamodel;
+package com.owncloud.android.datamodel
 
-import android.util.SparseArray;
+import android.util.SparseArray
 
 /**
  * Types of media folder.
  */
-public enum MediaFolderType {
-    CUSTOM(0),
-    IMAGE(1),
-    VIDEO(2);
+enum class MediaFolderType(@JvmField val id: Int) {
+    CUSTOM(0), IMAGE(1), VIDEO(2);
 
-    private Integer id;
+    companion object {
+        private val reverseMap = SparseArray<MediaFolderType>(3)
 
-    private static SparseArray<MediaFolderType> reverseMap = new SparseArray<>(3);
+        init {
+            reverseMap.put(CUSTOM.id, CUSTOM)
+            reverseMap.put(IMAGE.id, IMAGE)
+            reverseMap.put(VIDEO.id, VIDEO)
+        }
 
-    static {
-        reverseMap.put(CUSTOM.getId(), CUSTOM);
-        reverseMap.put(IMAGE.getId(), IMAGE);
-        reverseMap.put(VIDEO.getId(), VIDEO);
-    }
-
-    MediaFolderType(Integer id) {
-        this.id = id;
-    }
-
-    public static MediaFolderType getById(Integer id) {
-        return reverseMap.get(id);
-    }
-
-    public Integer getId() {
-        return this.id;
+        @JvmStatic
+        fun getById(id: Int?): MediaFolderType {
+            return reverseMap[id!!]
+        }
     }
 }
diff --git a/app/src/main/java/com/owncloud/android/datamodel/MediaFoldersModel.kt b/app/src/main/java/com/owncloud/android/datamodel/MediaFoldersModel.kt
index 5b164012eb..8af5310219 100644
--- a/app/src/main/java/com/owncloud/android/datamodel/MediaFoldersModel.kt
+++ b/app/src/main/java/com/owncloud/android/datamodel/MediaFoldersModel.kt
@@ -19,33 +19,6 @@
  * You should have received a copy of the GNU Affero General Public
  * License along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
+package com.owncloud.android.datamodel
 
-package com.owncloud.android.datamodel;
-
-import java.util.List;
-
-public class MediaFoldersModel {
-    private List<String> imageMediaFolders;
-    private List<String> videoMediaFolders;
-
-    public MediaFoldersModel(List<String> imageMediaFolders, List<String> videoMediaFolders) {
-        this.imageMediaFolders = imageMediaFolders;
-        this.videoMediaFolders = videoMediaFolders;
-    }
-
-    public List<String> getImageMediaFolders() {
-        return this.imageMediaFolders;
-    }
-
-    public List<String> getVideoMediaFolders() {
-        return this.videoMediaFolders;
-    }
-
-    public void setImageMediaFolders(List<String> imageMediaFolders) {
-        this.imageMediaFolders = imageMediaFolders;
-    }
-
-    public void setVideoMediaFolders(List<String> videoMediaFolders) {
-        this.videoMediaFolders = videoMediaFolders;
-    }
-}
+class MediaFoldersModel(var imageMediaFolders: List<String>, var videoMediaFolders: List<String>)
diff --git a/app/src/main/java/com/owncloud/android/datamodel/SyncedFolderProvider.java b/app/src/main/java/com/owncloud/android/datamodel/SyncedFolderProvider.java
index f36f27dfbb..baa107efdc 100644
--- a/app/src/main/java/com/owncloud/android/datamodel/SyncedFolderProvider.java
+++ b/app/src/main/java/com/owncloud/android/datamodel/SyncedFolderProvider.java
@@ -415,7 +415,7 @@ public class SyncedFolderProvider extends Observable {
         cv.put(ProviderMeta.ProviderTableMeta.SYNCED_FOLDER_UPLOAD_ACTION, syncedFolder.getUploadAction());
         cv.put(ProviderMeta.ProviderTableMeta.SYNCED_FOLDER_NAME_COLLISION_POLICY,
                syncedFolder.getNameCollisionPolicyInt());
-        cv.put(ProviderMeta.ProviderTableMeta.SYNCED_FOLDER_TYPE, syncedFolder.getType().getId());
+        cv.put(ProviderMeta.ProviderTableMeta.SYNCED_FOLDER_TYPE, syncedFolder.getType().id);
         cv.put(ProviderMeta.ProviderTableMeta.SYNCED_FOLDER_HIDDEN, syncedFolder.isHidden());
         cv.put(ProviderMeta.ProviderTableMeta.SYNCED_FOLDER_SUBFOLDER_RULE, syncedFolder.getSubfolderRule().ordinal());
 
diff --git a/app/src/main/java/com/owncloud/android/ui/adapter/SyncedFolderAdapter.java b/app/src/main/java/com/owncloud/android/ui/adapter/SyncedFolderAdapter.java
index 8a377a544d..2f31692980 100644
--- a/app/src/main/java/com/owncloud/android/ui/adapter/SyncedFolderAdapter.java
+++ b/app/src/main/java/com/owncloud/android/ui/adapter/SyncedFolderAdapter.java
@@ -248,7 +248,7 @@ public class SyncedFolderAdapter extends SectionedRecyclerViewAdapter<SectionedV
     public int getSectionByLocalPathAndType(String localPath, int type) {
         for (int i = 0; i < filteredSyncFolderItems.size(); i++) {
             if (filteredSyncFolderItems.get(i).getLocalPath().equalsIgnoreCase(localPath) &&
-                filteredSyncFolderItems.get(i).getType().getId().equals(type)) {
+                filteredSyncFolderItems.get(i).getType().id == type) {
                 return i;
             }
         }
diff --git a/app/src/main/java/com/owncloud/android/ui/dialog/parcel/SyncedFolderParcelable.java b/app/src/main/java/com/owncloud/android/ui/dialog/parcel/SyncedFolderParcelable.java
index 2972465c33..c1a223d20e 100644
--- a/app/src/main/java/com/owncloud/android/ui/dialog/parcel/SyncedFolderParcelable.java
+++ b/app/src/main/java/com/owncloud/android/ui/dialog/parcel/SyncedFolderParcelable.java
@@ -105,7 +105,7 @@ public class SyncedFolderParcelable implements Parcelable {
         dest.writeInt(existing ? 1 : 0);
         dest.writeInt(enabled ? 1 : 0);
         dest.writeInt(subfolderByDate ? 1 : 0);
-        dest.writeInt(type.getId());
+        dest.writeInt(type.id);
         dest.writeString(account);
         dest.writeInt(uploadAction);
         dest.writeInt(nameCollisionPolicy.serialize());