diff --git a/packages/rn-tester/android/app/src/main/java/com/facebook/react/uiapp/component/MyLegacyViewManager.java b/packages/rn-tester/android/app/src/main/java/com/facebook/react/uiapp/component/MyLegacyViewManager.java
deleted file mode 100644
index e2f34691472..00000000000
--- a/packages/rn-tester/android/app/src/main/java/com/facebook/react/uiapp/component/MyLegacyViewManager.java
+++ /dev/null
@@ -1,111 +0,0 @@
-/*
- * Copyright (c) Meta Platforms, Inc. and affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- */
-
-package com.facebook.react.uiapp.component;
-
-import android.graphics.Color;
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
-import com.facebook.react.bridge.ReactApplicationContext;
-import com.facebook.react.bridge.ReadableArray;
-import com.facebook.react.common.MapBuilder;
-import com.facebook.react.module.annotations.ReactModule;
-import com.facebook.react.uimanager.SimpleViewManager;
-import com.facebook.react.uimanager.ThemedReactContext;
-import com.facebook.react.uimanager.ViewProps;
-import com.facebook.react.uimanager.annotations.ReactProp;
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.Map;
-
-/** Legacy View manager (non Fabric compatible) for {@link MyNativeView} components. */
-@ReactModule(name = MyLegacyViewManager.REACT_CLASS)
-public class MyLegacyViewManager extends SimpleViewManager<MyNativeView> {
-
-  public static final String REACT_CLASS = "RNTMyLegacyNativeView";
-  private static final int COMMAND_CHANGE_BACKGROUND_COLOR = 42;
-  private final ReactApplicationContext mCallerContext;
-
-  public MyLegacyViewManager(ReactApplicationContext reactContext) {
-    mCallerContext = reactContext;
-  }
-
-  @NonNull
-  @Override
-  public String getName() {
-    return REACT_CLASS;
-  }
-
-  @NonNull
-  @Override
-  protected MyNativeView createViewInstance(@NonNull ThemedReactContext reactContext) {
-    MyNativeView view = new MyNativeView(reactContext);
-    view.setBackgroundColor(Color.RED);
-    return view;
-  }
-
-  @Override
-  @ReactProp(name = ViewProps.OPACITY, defaultFloat = 1.f)
-  public void setOpacity(@NonNull MyNativeView view, float opacity) {
-    super.setOpacity(view, opacity);
-  }
-
-  @ReactProp(name = ViewProps.COLOR)
-  public void setColor(@NonNull MyNativeView view, @Nullable String color) {
-    view.setBackgroundColor(Color.parseColor(color));
-  }
-
-  @ReactProp(name = "cornerRadius")
-  public void setCornerRadius(@NonNull MyNativeView view, @Nullable float cornerRadius) {
-    view.setCornerRadius(cornerRadius);
-  }
-
-  @Override
-  public final Map<String, Object> getExportedViewConstants() {
-    return Collections.singletonMap("PI", 3.14);
-  }
-
-  @Override
-  public final Map<String, Object> getExportedCustomBubblingEventTypeConstants() {
-    return new HashMap<>(
-        MapBuilder.<String, Object>builder()
-            .put(
-                "onColorChanged",
-                MapBuilder.of(
-                    "phasedRegistrationNames",
-                    MapBuilder.of(
-                        "bubbled", "onColorChanged", "captured", "onColorChangedCapture")))
-            .build());
-  }
-
-  @Override
-  public void receiveCommand(
-      @NonNull MyNativeView view, String commandId, @Nullable ReadableArray args) {
-    if (commandId.contentEquals("changeBackgroundColor")) {
-      int sentColor = Color.parseColor(args.getString(0));
-      view.setBackgroundColor(sentColor);
-    }
-  }
-
-  @SuppressWarnings("deprecation") // We intentionally want to test against the legacy API here.
-  @Override
-  public void receiveCommand(
-      @NonNull MyNativeView view, int commandId, @Nullable ReadableArray args) {
-    switch (commandId) {
-      case COMMAND_CHANGE_BACKGROUND_COLOR:
-        int sentColor = Color.parseColor(args.getString(0));
-        view.setBackgroundColor(sentColor);
-        break;
-    }
-  }
-
-  @Nullable
-  @Override
-  public Map<String, Integer> getCommandsMap() {
-    return MapBuilder.of("changeBackgroundColor", COMMAND_CHANGE_BACKGROUND_COLOR);
-  }
-}
diff --git a/packages/rn-tester/android/app/src/main/java/com/facebook/react/uiapp/component/MyLegacyViewManager.kt b/packages/rn-tester/android/app/src/main/java/com/facebook/react/uiapp/component/MyLegacyViewManager.kt
new file mode 100644
index 00000000000..5845e85af53
--- /dev/null
+++ b/packages/rn-tester/android/app/src/main/java/com/facebook/react/uiapp/component/MyLegacyViewManager.kt
@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+package com.facebook.react.uiapp.component
+
+import android.graphics.Color
+import com.facebook.react.bridge.ReactApplicationContext
+import com.facebook.react.bridge.ReadableArray
+import com.facebook.react.common.MapBuilder
+import com.facebook.react.module.annotations.ReactModule
+import com.facebook.react.uimanager.SimpleViewManager
+import com.facebook.react.uimanager.ThemedReactContext
+import com.facebook.react.uimanager.ViewProps
+import com.facebook.react.uimanager.annotations.ReactProp
+
+/** Legacy View manager (non Fabric compatible) for {@link MyNativeView} components. */
+@ReactModule(name = MyLegacyViewManager.REACT_CLASS)
+internal class MyLegacyViewManager(reactContext: ReactApplicationContext) :
+    SimpleViewManager<MyNativeView>() {
+
+  private val callerContext: ReactApplicationContext = reactContext
+
+  override fun getName(): String = REACT_CLASS
+
+  override fun createViewInstance(reactContext: ThemedReactContext): MyNativeView =
+      MyNativeView(reactContext).apply { setBackgroundColor(Color.RED) }
+
+  @ReactProp(name = ViewProps.OPACITY, defaultFloat = 1f)
+  override fun setOpacity(view: MyNativeView, opacity: Float) {
+    super.setOpacity(view, opacity)
+  }
+
+  @ReactProp(name = ViewProps.COLOR)
+  fun setColor(view: MyNativeView, color: String) {
+    view.setBackgroundColor(Color.parseColor(color))
+  }
+
+  @ReactProp(name = "cornerRadius")
+  fun setCornerRadius(view: MyNativeView, cornerRadius: Float) {
+    if (cornerRadius !== null) {
+      view.setCornerRadius(cornerRadius)
+    }
+  }
+
+  override fun getExportedViewConstants(): Map<String, Any> = mapOf("PI" to 3.14)
+
+  override fun getExportedCustomBubblingEventTypeConstants(): Map<String, Any> {
+    return MapBuilder.builder<String, Any>()
+        .put(
+            "onColorChanged",
+            MapBuilder.of(
+                "phasedRegistrationNames",
+                MapBuilder.of("bubbled", "onColorChanged", "captured", "onColorChangedCapture")))
+        .build()
+  }
+
+  override fun receiveCommand(view: MyNativeView, commandId: String, args: ReadableArray?) {
+    if (commandId.contentEquals("changeBackgroundColor")) {
+      val sentColor: Int = Color.parseColor(args?.getString(0))
+      view.setBackgroundColor(sentColor)
+    }
+  }
+
+  @Suppress("DEPRECATION") // We intentionally want to test against the legacy API here.
+  override fun receiveCommand(view: MyNativeView, commandId: Int, args: ReadableArray?) {
+    when (commandId) {
+      COMMAND_CHANGE_BACKGROUND_COLOR -> {
+        val sentColor: Int = Color.parseColor(args?.getString(0))
+        view.setBackgroundColor(sentColor)
+      }
+    }
+  }
+
+  override fun getCommandsMap(): Map<String, Int> =
+      mapOf("changeBackgroundColor" to COMMAND_CHANGE_BACKGROUND_COLOR)
+
+  companion object {
+    const val REACT_CLASS = "RNTMyLegacyNativeView"
+    const val COMMAND_CHANGE_BACKGROUND_COLOR = 42
+  }
+}