diff --git a/app/src/main/java/com/simplemobiletools/contacts/App.kt b/app/src/main/kotlin/com/simplemobiletools/contacts/App.kt
similarity index 100%
rename from app/src/main/java/com/simplemobiletools/contacts/App.kt
rename to app/src/main/kotlin/com/simplemobiletools/contacts/App.kt
diff --git a/app/src/main/java/com/simplemobiletools/contacts/activities/MainActivity.kt b/app/src/main/kotlin/com/simplemobiletools/contacts/activities/MainActivity.kt
similarity index 98%
rename from app/src/main/java/com/simplemobiletools/contacts/activities/MainActivity.kt
rename to app/src/main/kotlin/com/simplemobiletools/contacts/activities/MainActivity.kt
index a5709603..efed2b46 100644
--- a/app/src/main/java/com/simplemobiletools/contacts/activities/MainActivity.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/contacts/activities/MainActivity.kt
@@ -16,7 +16,7 @@ import com.simplemobiletools.contacts.extensions.config
 import com.simplemobiletools.contacts.helpers.ContactsHelper
 
 class MainActivity : SimpleActivity() {
-    var storedUseEnglish = false
+    private var storedUseEnglish = false
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
diff --git a/app/src/main/java/com/simplemobiletools/contacts/activities/SettingsActivity.kt b/app/src/main/kotlin/com/simplemobiletools/contacts/activities/SettingsActivity.kt
similarity index 100%
rename from app/src/main/java/com/simplemobiletools/contacts/activities/SettingsActivity.kt
rename to app/src/main/kotlin/com/simplemobiletools/contacts/activities/SettingsActivity.kt
diff --git a/app/src/main/java/com/simplemobiletools/contacts/activities/SimpleActivity.kt b/app/src/main/kotlin/com/simplemobiletools/contacts/activities/SimpleActivity.kt
similarity index 100%
rename from app/src/main/java/com/simplemobiletools/contacts/activities/SimpleActivity.kt
rename to app/src/main/kotlin/com/simplemobiletools/contacts/activities/SimpleActivity.kt
diff --git a/app/src/main/java/com/simplemobiletools/contacts/activities/SplashActivity.kt b/app/src/main/kotlin/com/simplemobiletools/contacts/activities/SplashActivity.kt
similarity index 100%
rename from app/src/main/java/com/simplemobiletools/contacts/activities/SplashActivity.kt
rename to app/src/main/kotlin/com/simplemobiletools/contacts/activities/SplashActivity.kt
diff --git a/app/src/main/java/com/simplemobiletools/contacts/extensions/Context.kt b/app/src/main/kotlin/com/simplemobiletools/contacts/extensions/Context.kt
similarity index 100%
rename from app/src/main/java/com/simplemobiletools/contacts/extensions/Context.kt
rename to app/src/main/kotlin/com/simplemobiletools/contacts/extensions/Context.kt
diff --git a/app/src/main/java/com/simplemobiletools/contacts/helpers/Config.kt b/app/src/main/kotlin/com/simplemobiletools/contacts/helpers/Config.kt
similarity index 100%
rename from app/src/main/java/com/simplemobiletools/contacts/helpers/Config.kt
rename to app/src/main/kotlin/com/simplemobiletools/contacts/helpers/Config.kt
diff --git a/app/src/main/java/com/simplemobiletools/contacts/helpers/Constants.kt b/app/src/main/kotlin/com/simplemobiletools/contacts/helpers/Constants.kt
similarity index 100%
rename from app/src/main/java/com/simplemobiletools/contacts/helpers/Constants.kt
rename to app/src/main/kotlin/com/simplemobiletools/contacts/helpers/Constants.kt
diff --git a/app/src/main/java/com/simplemobiletools/contacts/helpers/ContactsHelper.kt b/app/src/main/kotlin/com/simplemobiletools/contacts/helpers/ContactsHelper.kt
similarity index 100%
rename from app/src/main/java/com/simplemobiletools/contacts/helpers/ContactsHelper.kt
rename to app/src/main/kotlin/com/simplemobiletools/contacts/helpers/ContactsHelper.kt
diff --git a/app/src/main/java/com/simplemobiletools/contacts/models/Contact.kt b/app/src/main/kotlin/com/simplemobiletools/contacts/models/Contact.kt
similarity index 100%
rename from app/src/main/java/com/simplemobiletools/contacts/models/Contact.kt
rename to app/src/main/kotlin/com/simplemobiletools/contacts/models/Contact.kt