diff --git a/app/src/main/java/com/simplemobiletools/gallery/activities/MainActivity.java b/app/src/main/java/com/simplemobiletools/gallery/activities/MainActivity.java
index db1a5a90e..17d64ed10 100644
--- a/app/src/main/java/com/simplemobiletools/gallery/activities/MainActivity.java
+++ b/app/src/main/java/com/simplemobiletools/gallery/activities/MainActivity.java
@@ -210,9 +210,10 @@ public class MainActivity extends SimpleActivity
                         final Directory directory = directories.get(fileDir);
                         final int newImageCnt = directory.getMediaCnt() + 1;
                         directory.setMediaCnt(newImageCnt);
+                        directory.addSize(file.length());
                     } else if (!mToBeDeleted.contains(fileDir)) {
                         final String dirName = Utils.getFilename(fileDir);
-                        directories.put(fileDir, new Directory(fileDir, path, dirName, 1, timestamp));
+                        directories.put(fileDir, new Directory(fileDir, path, dirName, 1, timestamp, file.length()));
                     }
                 } while (cursor.moveToNext());
                 cursor.close();
diff --git a/app/src/main/java/com/simplemobiletools/gallery/models/Directory.java b/app/src/main/java/com/simplemobiletools/gallery/models/Directory.java
index 9f8c155f1..14aafe3de 100644
--- a/app/src/main/java/com/simplemobiletools/gallery/models/Directory.java
+++ b/app/src/main/java/com/simplemobiletools/gallery/models/Directory.java
@@ -1,50 +1,60 @@
 package com.simplemobiletools.gallery.models;
 
 public class Directory implements Comparable {
-    private final String path;
-    private final String thumbnail;
-    private final String name;
-    private final long timestamp;
-    private int mediaCnt;
+    private final String mPath;
+    private final String mThumbnail;
+    private final String mName;
+    private final long mTimestamp;
+    private int mMediaCnt;
+    private long mBytes;
 
-    public Directory(String path, String thumbnail, String name, int mediaCnt, long timestamp) {
-        this.path = path;
-        this.thumbnail = thumbnail;
-        this.name = name;
-        this.mediaCnt = mediaCnt;
-        this.timestamp = timestamp;
+    public Directory(String path, String thumbnail, String name, int mediaCnt, long timestamp, long size) {
+        mPath = path;
+        mThumbnail = thumbnail;
+        mName = name;
+        mMediaCnt = mediaCnt;
+        mTimestamp = timestamp;
+        mBytes = size;
     }
 
     public String getPath() {
-        return path;
+        return mPath;
     }
 
     public String getThumbnail() {
-        return thumbnail;
+        return mThumbnail;
     }
 
     public String getName() {
-        return name;
+        return mName;
     }
 
     public int getMediaCnt() {
-        return mediaCnt;
+        return mMediaCnt;
     }
 
     public void setMediaCnt(int cnt) {
-        mediaCnt = cnt;
+        mMediaCnt = cnt;
     }
 
     public long getTimestamp() {
-        return timestamp;
+        return mTimestamp;
+    }
+
+    public long getSize() {
+        return mBytes;
+    }
+
+    public void addSize(long bytes) {
+        mBytes += bytes;
     }
 
     @Override
     public int compareTo(Object object) {
         final Directory directory = (Directory) object;
-        if (this.timestamp < directory.getTimestamp()) {
+        if (mTimestamp < directory.getTimestamp()) {
             return 1;
-        } else if (this.timestamp > directory.getTimestamp()) {
+        } else if (mTimestamp > directory.getTimestamp()) {
             return -1;
         }
         return 0;
diff --git a/app/src/main/java/com/simplemobiletools/gallery/models/Medium.java b/app/src/main/java/com/simplemobiletools/gallery/models/Medium.java
index d875ce946..c443536ff 100644
--- a/app/src/main/java/com/simplemobiletools/gallery/models/Medium.java
+++ b/app/src/main/java/com/simplemobiletools/gallery/models/Medium.java
@@ -4,26 +4,26 @@ import java.io.Serializable;
 
 public class Medium implements Serializable, Comparable {
     private static final long serialVersionUID = -6543139465975455L;
-    private final String path;
-    private final boolean isVideo;
-    private final long timestamp;
+    private final String mPath;
+    private final boolean mIsVideo;
+    private final long mTimestamp;
 
     public Medium(String path, boolean isVideo, long timestamp) {
-        this.path = path;
-        this.isVideo = isVideo;
-        this.timestamp = timestamp;
+        mPath = path;
+        mIsVideo = isVideo;
+        mTimestamp = timestamp;
     }
 
     public String getPath() {
-        return path;
+        return mPath;
     }
 
     public boolean getIsVideo() {
-        return isVideo;
+        return mIsVideo;
     }
 
     public long getTimestamp() {
-        return timestamp;
+        return mTimestamp;
     }
 
     public boolean isGif() {
@@ -33,9 +33,9 @@ public class Medium implements Serializable, Comparable {
     @Override
     public int compareTo(Object object) {
         final Medium medium = (Medium) object;
-        if (this.timestamp < medium.getTimestamp()) {
+        if (mTimestamp < medium.getTimestamp()) {
             return 1;
-        } else if (this.timestamp > medium.getTimestamp()) {
+        } else if (mTimestamp > medium.getTimestamp()) {
             return -1;
         }
         return 0;
diff --git a/app/src/main/res/mipmap-hdpi/sort.png b/app/src/main/res/mipmap-hdpi/sort.png
new file mode 100644
index 000000000..c62475e1f
Binary files /dev/null and b/app/src/main/res/mipmap-hdpi/sort.png differ
diff --git a/app/src/main/res/mipmap-mdpi/sort.png b/app/src/main/res/mipmap-mdpi/sort.png
new file mode 100644
index 000000000..552bb7c33
Binary files /dev/null and b/app/src/main/res/mipmap-mdpi/sort.png differ
diff --git a/app/src/main/res/mipmap-xhdpi/sort.png b/app/src/main/res/mipmap-xhdpi/sort.png
new file mode 100644
index 000000000..1f9dccfd8
Binary files /dev/null and b/app/src/main/res/mipmap-xhdpi/sort.png differ
diff --git a/app/src/main/res/mipmap-xxhdpi/sort.png b/app/src/main/res/mipmap-xxhdpi/sort.png
new file mode 100644
index 000000000..42cf9765f
Binary files /dev/null and b/app/src/main/res/mipmap-xxhdpi/sort.png differ
diff --git a/app/src/main/res/mipmap-xxxhdpi/sort.png b/app/src/main/res/mipmap-xxxhdpi/sort.png
new file mode 100644
index 000000000..f2454f114
Binary files /dev/null and b/app/src/main/res/mipmap-xxxhdpi/sort.png differ
diff --git a/app/src/main/res/values-it/strings.xml b/app/src/main/res/values-it/strings.xml
index 73c48a107..34d383b94 100644
--- a/app/src/main/res/values-it/strings.xml
+++ b/app/src/main/res/values-it/strings.xml
@@ -20,6 +20,12 @@
     <string name="setting_wallpaper">Impostazione sfondo</string>
     <string name="open_camera">Apri fotocamera</string>
     <string name="unknown_error">Riscontrato un errore sconosciuto</string>
+    <string name="sort_by">Sort by</string>
+    <string name="name">Name</string>
+    <string name="size">Size</string>
+    <string name="date">Date</string>
+    <string name="ascending">Ascending</string>
+    <string name="descending">Descending</string>
 
     <plurals name="folders_deleted">
         <item quantity="one">1 cartella eliminata</item>
diff --git a/app/src/main/res/values-ja/strings.xml b/app/src/main/res/values-ja/strings.xml
index 9f0df7ada..f21a4df01 100644
--- a/app/src/main/res/values-ja/strings.xml
+++ b/app/src/main/res/values-ja/strings.xml
@@ -20,6 +20,12 @@
     <string name="setting_wallpaper">壁紙の設定</string>
     <string name="open_camera">カメラを開く</string>
     <string name="unknown_error">不明なエラーが発生しました</string>
+    <string name="sort_by">Sort by</string>
+    <string name="name">Name</string>
+    <string name="size">Size</string>
+    <string name="date">Date</string>
+    <string name="ascending">Ascending</string>
+    <string name="descending">Descending</string>
 
     <plurals name="folders_deleted">
         <item quantity="one">1 フォルダーを削除しました</item>
diff --git a/app/src/main/res/values-sv/strings.xml b/app/src/main/res/values-sv/strings.xml
index b72801714..9a23192db 100644
--- a/app/src/main/res/values-sv/strings.xml
+++ b/app/src/main/res/values-sv/strings.xml
@@ -20,6 +20,12 @@
     <string name="setting_wallpaper">Inställningar för bakgrundsbild</string>
     <string name="open_camera">Starta kameran</string>
     <string name="unknown_error">Ett okänt fel har uppstått</string>
+    <string name="sort_by">Sort by</string>
+    <string name="name">Name</string>
+    <string name="size">Size</string>
+    <string name="date">Date</string>
+    <string name="ascending">Ascending</string>
+    <string name="descending">Descending</string>
 
     <plurals name="folders_deleted">
         <item quantity="one">1 mapp borttagen</item>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index ba4cd6245..839595de3 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -20,6 +20,12 @@
     <string name="setting_wallpaper">Setting wallpaper</string>
     <string name="open_camera">Open camera</string>
     <string name="unknown_error">An unknown error occurred</string>
+    <string name="sort_by">Sort by</string>
+    <string name="name">Name</string>
+    <string name="size">Size</string>
+    <string name="date">Date</string>
+    <string name="ascending">Ascending</string>
+    <string name="descending">Descending</string>
 
     <plurals name="folders_deleted">
         <item quantity="one">1 folder deleted</item>