diff --git a/app/src/main/java/com/simplemobiletools/filemanager/Constants.java b/app/src/main/java/com/simplemobiletools/filemanager/Constants.java
deleted file mode 100644
index 49ec4816..00000000
--- a/app/src/main/java/com/simplemobiletools/filemanager/Constants.java
+++ /dev/null
@@ -1,15 +0,0 @@
-package com.simplemobiletools.filemanager;
-
-public class Constants {
-    public static final String PATH = "path";
-
-    // shared preferences
-    public static final String PREFS_KEY = "File Manager";
-    public static final String IS_FIRST_RUN = "is_first_run";
-    public static final String IS_DARK_THEME = "is_dark_theme";
-    public static final String SHOW_HIDDEN = "show_hidden";
-    public static final String TREE_URI = "tree_uri";
-
-    // global intents
-    public static final int OPEN_DOCUMENT_TREE = 1000;
-}
diff --git a/app/src/main/java/com/simplemobiletools/filemanager/fragments/ItemsFragment.java b/app/src/main/java/com/simplemobiletools/filemanager/fragments/ItemsFragment.java
index 4199026c..25b54b23 100644
--- a/app/src/main/java/com/simplemobiletools/filemanager/fragments/ItemsFragment.java
+++ b/app/src/main/java/com/simplemobiletools/filemanager/fragments/ItemsFragment.java
@@ -107,7 +107,7 @@ public class ItemsFragment extends android.support.v4.app.Fragment
     }
 
     private void fillItems() {
-        mPath = getArguments().getString(Constants.PATH);
+        mPath = getArguments().getString(Constants.INSTANCE.getPATH());
         final List<FileDirItem> newItems = getItems(mPath);
         Collections.sort(newItems);
         if (mItems != null && newItems.toString().equals(mItems.toString())) {
diff --git a/app/src/main/kotlin/com/simplemobiletools/filemanager/Config.kt b/app/src/main/kotlin/com/simplemobiletools/filemanager/Config.kt
index fe400f04..15d9a0ed 100644
--- a/app/src/main/kotlin/com/simplemobiletools/filemanager/Config.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/filemanager/Config.kt
@@ -13,22 +13,22 @@ class Config(context: Context) {
     }
 
     init {
-        mPrefs = context.getSharedPreferences(Constants.PREFS_KEY, Context.MODE_PRIVATE)
+        mPrefs = context.getSharedPreferences(PREFS_KEY, Context.MODE_PRIVATE)
     }
 
     var isFirstRun: Boolean
-        get() = mPrefs.getBoolean(Constants.IS_FIRST_RUN, true)
-        set(firstRun) = mPrefs.edit().putBoolean(Constants.IS_FIRST_RUN, firstRun).apply()
+        get() = mPrefs.getBoolean(IS_FIRST_RUN, true)
+        set(firstRun) = mPrefs.edit().putBoolean(IS_FIRST_RUN, firstRun).apply()
 
     var isDarkTheme: Boolean
-        get() = mPrefs.getBoolean(Constants.IS_DARK_THEME, false)
-        set(isDarkTheme) = mPrefs.edit().putBoolean(Constants.IS_DARK_THEME, isDarkTheme).apply()
+        get() = mPrefs.getBoolean(IS_DARK_THEME, false)
+        set(isDarkTheme) = mPrefs.edit().putBoolean(IS_DARK_THEME, isDarkTheme).apply()
 
     var showHidden: Boolean
-        get() = mPrefs.getBoolean(Constants.SHOW_HIDDEN, false)
-        set(show) = mPrefs.edit().putBoolean(Constants.SHOW_HIDDEN, show).apply()
+        get() = mPrefs.getBoolean(SHOW_HIDDEN, false)
+        set(show) = mPrefs.edit().putBoolean(SHOW_HIDDEN, show).apply()
 
     var treeUri: String
-        get() = mPrefs.getString(Constants.TREE_URI, "")
-        set(uri) = mPrefs.edit().putString(Constants.TREE_URI, uri).apply()
+        get() = mPrefs.getString(TREE_URI, "")
+        set(uri) = mPrefs.edit().putString(TREE_URI, uri).apply()
 }
diff --git a/app/src/main/kotlin/com/simplemobiletools/filemanager/Constants.kt b/app/src/main/kotlin/com/simplemobiletools/filemanager/Constants.kt
new file mode 100644
index 00000000..19e75328
--- /dev/null
+++ b/app/src/main/kotlin/com/simplemobiletools/filemanager/Constants.kt
@@ -0,0 +1,15 @@
+package com.simplemobiletools.filemanager
+
+// shared preferences
+val PREFS_KEY = "File Manager"
+val IS_FIRST_RUN = "is_first_run"
+val IS_DARK_THEME = "is_dark_theme"
+val SHOW_HIDDEN = "show_hidden"
+val TREE_URI = "tree_uri"
+
+// global intents
+val OPEN_DOCUMENT_TREE = 1000
+
+object Constants {
+    val PATH = "path"
+}
diff --git a/app/src/main/kotlin/com/simplemobiletools/filemanager/activities/SimpleActivity.kt b/app/src/main/kotlin/com/simplemobiletools/filemanager/activities/SimpleActivity.kt
index 811b59df..2485b8a0 100644
--- a/app/src/main/kotlin/com/simplemobiletools/filemanager/activities/SimpleActivity.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/filemanager/activities/SimpleActivity.kt
@@ -7,9 +7,8 @@ import android.os.Build
 import android.os.Bundle
 import android.support.v7.app.AppCompatActivity
 import android.view.MenuItem
-
 import com.simplemobiletools.filemanager.Config
-import com.simplemobiletools.filemanager.Constants
+import com.simplemobiletools.filemanager.OPEN_DOCUMENT_TREE
 import com.simplemobiletools.filemanager.R
 import com.simplemobiletools.filepicker.extensions.isShowingWritePermissions
 import java.io.File
@@ -35,7 +34,7 @@ open class SimpleActivity : AppCompatActivity() {
 
     override fun onActivityResult(requestCode: Int, resultCode: Int, resultData: Intent?) {
         super.onActivityResult(requestCode, resultCode, resultData)
-        if (requestCode == Constants.OPEN_DOCUMENT_TREE && resultCode == Activity.RESULT_OK && resultData != null) {
+        if (requestCode == OPEN_DOCUMENT_TREE && resultCode == Activity.RESULT_OK && resultData != null) {
             saveTreeUri(resultData)
         }
     }
@@ -49,5 +48,5 @@ open class SimpleActivity : AppCompatActivity() {
         contentResolver.takePersistableUriPermission(treeUri, takeFlags)
     }
 
-    fun isShowingPermDialog(file: File) = isShowingWritePermissions(file, mConfig.treeUri, Constants.OPEN_DOCUMENT_TREE)
+    fun isShowingPermDialog(file: File) = isShowingWritePermissions(file, mConfig.treeUri, OPEN_DOCUMENT_TREE)
 }