Basic push to containerStack

android/app/src/main/java/com/reactnativenavigation/layout/ContainerStackLayout.java

 package com.reactnativenavigation.layout;
 
 import android.content.Context;
+import android.view.View;
 import android.widget.FrameLayout;
 
 public class ContainerStackLayout extends FrameLayout {
     public ContainerStackLayout(Context context) {
         super(context);
     }
+
+    public void push(View view) {
+        addView(view);
+        removeView(getChildAt(0));
+    }
 }

android/app/src/main/java/com/reactnativenavigation/react/NavigationModule.java

         NavigationActivity.instance.runOnUiThread(new Runnable() {
             @Override
             public void run() {
-                LayoutFactory factory = new LayoutFactory(NavigationActivity.instance, new LayoutFactory.ReactRootViewCreator() {
-                    @Override
-                    public View create(String id, String name) {
-                        ReactRootView rootView = new ReactRootView(NavigationActivity.instance);
-                        Bundle opts = new Bundle();
-                        opts.putString("id", id);
-                        rootView.startReactApplication(NavigationActivity.instance.getHost().getReactInstanceManager(), name, opts);
-                        return rootView;
-                    }
-                }, new BottomTabsCreator());
+                LayoutFactory factory =
+                        new LayoutFactory(NavigationActivity.instance, new LayoutFactory.ReactRootViewCreator() {
+                            @Override
+                            public View create(String id, String name) {
+                                ReactRootView rootView = new ReactRootView(NavigationActivity.instance);
+                                Bundle opts = new Bundle();
+                                opts.putString("id", id);
+                                rootView.startReactApplication(NavigationActivity.instance.getHost().getReactInstanceManager(), name, opts);
+                                return rootView;
+                            }
+                        }, new BottomTabsCreator());
 
                 final LayoutNode layoutTreeRoot = readableMapToLayoutNode(layoutTree);
                 final View rootView = factory.create(layoutTreeRoot);
         });
     }
 
+    @ReactMethod
+    public void push(String onContainerId, final ReadableMap layout) {
+        NavigationActivity.instance.runOnUiThread(new Runnable() {
+            @Override
+            public void run() {
+                LayoutFactory factory =
+                        new LayoutFactory(NavigationActivity.instance, new LayoutFactory.ReactRootViewCreator() {
+                            @Override
+                            public View create(String id, String name) {
+                                ReactRootView rootView = new ReactRootView(NavigationActivity.instance);
+                                Bundle opts = new Bundle();
+                                opts.putString("id", id);
+                                rootView.startReactApplication(NavigationActivity.instance.getHost().getReactInstanceManager(), name, opts);
+                                return rootView;
+                            }
+                        }, new BottomTabsCreator());
+                final LayoutNode layoutNode = readableMapToLayoutNode(layout);
+                final View rootView = factory.create(layoutNode);
+                NavigationActivity.instance.setContentView(rootView);
+            }
+        });
+    }
+
     private LayoutNode readableMapToLayoutNode(ReadableMap readableMap) {
         final LayoutNode layoutNode = new LayoutNode();
         layoutNode.id = readableMap.getString("id");
 
     private Map<String, Object> readableMapToJavaMap(ReadableMap readableMap) {
         final Map<String, Object> map = new HashMap<>();
-        for (ReadableMapKeySetIterator it = readableMap.keySetIterator(); it.hasNextKey();) {
+        for (ReadableMapKeySetIterator it = readableMap.keySetIterator(); it.hasNextKey(); ) {
             final String key = it.nextKey();
             switch (readableMap.getType(key)) {
                 case String:

android/app/src/test/java/com/reactnativenavigation/LayoutFactoryTest.java

         verify(bottomTabsMock).add(eq("#1"));
     }
 
+    @Test
+    public void pushAScreenToScreenStack() throws Exception {
+        when(reactRootViewCreator.create(eq(NODE_ID), eq(REACT_ROOT_VIEW_KEY))).thenReturn(mockView);
+        final LayoutNode container = createContainerNode();
+        final LayoutNode stackNode = createContainerStackNode(container);
+        final ContainerStackLayout containerStackLayout = (ContainerStackLayout) createLayoutFactory().create(stackNode);
+
+        when(reactRootViewCreator.create(eq(OTHER_NODE_ID), eq(OTHER_REACT_ROOT_VIEW_KEY))).thenReturn(otherMockView);
+        final LayoutNode pushedContainer = createContainerNode(OTHER_NODE_ID, OTHER_REACT_ROOT_VIEW_KEY);
+        containerStackLayout.push(createLayoutFactory().create(pushedContainer));
+
+        ViewGroup result = (ViewGroup) TestUtils.assertViewChildrenCount(containerStackLayout, 1).get(0);
+        assertThat(result.getChildAt(0)).isEqualTo(otherMockView);
+    }
 
     @Test(expected = IllegalArgumentException.class)
     public void throwsExceptionForUnknownType() throws Exception {