Layouts are now implemented natively for Android.

ui/layouts/stack-layout/stack-layout.android.ts

@@ -0,0 +1,38 @@
+import dependencyObservable = require("ui/core/dependency-observable");
+import proxy = require("ui/core/proxy");
+import common = require("ui/layouts/stack-layout/stack-layout-common");
+import enums = require("ui/enums");
+
+// merge the exports of the common file with the exports of this file
+declare var exports;
+require("utils/module-merge").merge(common, exports);
+
+export class StackLayout extends common.StackLayout {
+
+    static setNativeOrientationProperty(data: dependencyObservable.PropertyChangeData): void {
+        var stackLayout = <StackLayout>data.object;
+        var nativeView = stackLayout._nativeView;
+        if (data.newValue === enums.Orientation.vertical) {
+            nativeView.setOrientation(org.nativescript.widgets.Orientation.vertical);
+        }
+        else {
+            nativeView.setOrientation(org.nativescript.widgets.Orientation.horzontal);
+        }        
+    }
+
+    private _layout: org.nativescript.widgets.StackLayout;
+
+    get android(): org.nativescript.widgets.StackLayout {
+        return this._layout;
+    }
+
+    get _nativeView(): org.nativescript.widgets.StackLayout {
+        return this._layout;
+    }
+
+    public _createUI() {
+        this._layout = new org.nativescript.widgets.StackLayout(this._context);
+    }
+}
+
+(<proxy.PropertyMetadata>common.StackLayout.orientationProperty.metadata).onSetNativeValue = StackLayout.setNativeOrientationProperty;