diff --git a/toothpick-sample/src/main/java/com/example/toothpick/activity/AddNewActivity.java b/toothpick-sample/src/main/java/com/example/toothpick/activity/AddNewActivity.java
deleted file mode 100644
index 7a8287e9..00000000
--- a/toothpick-sample/src/main/java/com/example/toothpick/activity/AddNewActivity.java
+++ /dev/null
@@ -1,49 +0,0 @@
-package com.example.toothpick.activity;
-
-import android.app.Activity;
-import android.content.Intent;
-import android.os.Bundle;
-import android.widget.Button;
-import android.widget.EditText;
-import androidx.appcompat.app.AppCompatActivity;
-import com.example.toothpick.R;
-import com.example.toothpick.annotation.ApplicationScope;
-import com.example.toothpick.helper.BackpackItemValidator;
-import javax.inject.Inject;
-import toothpick.Toothpick;
-
-public class AddNewActivity extends AppCompatActivity {
-
-    public final static String NEW_ITEM_NAME_KEY = "name";
-
-    //will be created as a singleton in the root scope
-    //and is releasable under memory pressure
-    @Inject BackpackItemValidator backpackItemValidator;
-
-    @Override
-    public void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-
-        // 1. Open Activity scope as child of Application scope
-        // 2. Inject dependencies
-        Toothpick.openScopes(ApplicationScope.class, this)
-            .inject(this);
-
-        setupUIComponents();
-    }
-
-    private void setupUIComponents() {
-        setContentView(R.layout.backpack_new);
-        final EditText editText = findViewById(R.id.new_name);
-        Button button = findViewById(R.id.add_item);
-        button.setOnClickListener( view ->  {
-            String text = editText.getText().toString();
-            if (backpackItemValidator.isValidName(text)) {
-                Intent intent = new Intent()
-                    .putExtra(NEW_ITEM_NAME_KEY, text);
-                setResult(Activity.RESULT_OK, intent);
-                finish();
-            }
-        });
-    }
-}
diff --git a/toothpick-sample/src/main/java/com/example/toothpick/activity/AddNewActivity.kt b/toothpick-sample/src/main/java/com/example/toothpick/activity/AddNewActivity.kt
new file mode 100644
index 00000000..e524bd65
--- /dev/null
+++ b/toothpick-sample/src/main/java/com/example/toothpick/activity/AddNewActivity.kt
@@ -0,0 +1,54 @@
+package com.example.toothpick.activity
+
+import android.content.Intent
+import android.os.Bundle
+import android.view.View
+import android.widget.Button
+import android.widget.EditText
+import androidx.appcompat.app.AppCompatActivity
+import com.example.toothpick.R
+import com.example.toothpick.annotation.ApplicationScope
+import com.example.toothpick.helper.BackpackItemValidator
+import toothpick.Toothpick
+import toothpick.ktp.KTP
+import toothpick.smoothie.lifecycle.closeOnDestroy
+import javax.inject.Inject
+
+class AddNewActivity : AppCompatActivity() {
+
+    companion object {
+        const val NEW_ITEM_NAME_KEY = "name"
+    }
+
+    //will be created as a singleton in the root scope
+    //and is releasable under memory pressure
+    @Inject
+    lateinit var backpackItemValidator: BackpackItemValidator
+
+    public override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        // 1. Open Activity scope as child of Application scope
+        // 2. Inject dependencies
+        KTP.openScope(ApplicationScope::class.java)
+                .openSubScope(this)
+                .closeOnDestroy(this)
+                .inject(this)
+        setupUIComponents()
+    }
+
+    private fun setupUIComponents() {
+        setContentView(R.layout.backpack_new)
+        val editText = findViewById<EditText>(R.id.new_name)
+        val button = findViewById<Button>(R.id.add_item)
+        button.setOnClickListener {
+            val text = editText.text.toString()
+            if (backpackItemValidator.isValidName(text)) {
+                val intent = Intent()
+                        .putExtra(NEW_ITEM_NAME_KEY, text)
+                setResult(RESULT_OK, intent)
+                finish()
+            }
+        }
+    }
+}
diff --git a/toothpick-sample/src/main/java/com/example/toothpick/activity/SimpleBackpackItemsActivity.kt b/toothpick-sample/src/main/java/com/example/toothpick/activity/SimpleBackpackItemsActivity.kt
index 3af09af8..525e3cb8 100644
--- a/toothpick-sample/src/main/java/com/example/toothpick/activity/SimpleBackpackItemsActivity.kt
+++ b/toothpick-sample/src/main/java/com/example/toothpick/activity/SimpleBackpackItemsActivity.kt
@@ -10,7 +10,7 @@ import androidx.recyclerview.widget.DividerItemDecoration
 import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
 import com.example.toothpick.R
-import com.example.toothpick.activity.AddNewActivity.NEW_ITEM_NAME_KEY
+import com.example.toothpick.activity.AddNewActivity.Companion.NEW_ITEM_NAME_KEY
 import com.example.toothpick.adapter.BackpackAdapter
 import com.example.toothpick.adapter.IBackpackAdapter
 import com.example.toothpick.annotation.ApplicationScope
@@ -86,7 +86,6 @@ class SimpleBackpackItemsActivity : AppCompatActivity() {
         }
     }
 
-
     private fun setupUIComponents() {
         setContentView(R.layout.backpack_list)
         coordinatorLayout = findViewById(R.id.coordinatorLayout)