TopBarBackgroundView impl

lib/android/app/src/main/java/com/reactnativenavigation/parse/LayoutFactory.java

 import com.reactnativenavigation.views.titlebar.TitleBarReactViewCreator;
 import com.reactnativenavigation.views.TopBarButtonCreator;
 import com.reactnativenavigation.views.TopTabsLayoutCreator;
+import com.reactnativenavigation.views.topbar.TopBarBackgroundViewCreator;
 
 import java.util.ArrayList;
 import java.util.List;
         StackController stackController = new StackController(activity,
                 new TopBarButtonCreator(reactInstanceManager),
                 new TitleBarReactViewCreator(reactInstanceManager),
+                new TopBarBackgroundViewCreator(reactInstanceManager),
                 node.id,
                 getOptions(node)
         );

lib/android/app/src/main/java/com/reactnativenavigation/parse/TopBarBackgroundOptions.java

 
 import com.reactnativenavigation.parse.params.Color;
 import com.reactnativenavigation.parse.params.NullColor;
+import com.reactnativenavigation.parse.params.NullText;
+import com.reactnativenavigation.parse.params.Text;
 import com.reactnativenavigation.parse.parsers.ColorParser;
+import com.reactnativenavigation.parse.parsers.TextParser;
 
 import org.json.JSONObject;
 
         }
 
         options.color = ColorParser.parse(json, "color");
+        options.component = TextParser.parse(json, "component");
 
         return options;
     }
 
     public Color color = new NullColor();
+    public Text component = new NullText();
 
     void mergeWith(final TopBarBackgroundOptions other) {
         if (other.color.hasValue()) color = other.color;

lib/android/app/src/main/java/com/reactnativenavigation/viewcontrollers/StackController.java

 import com.reactnativenavigation.views.StackLayout;
 import com.reactnativenavigation.views.TopBar;
 import com.reactnativenavigation.views.titlebar.TitleBarReactViewCreator;
+import com.reactnativenavigation.views.topbar.TopBarBackgroundViewCreator;
 
 import java.util.Collection;
 import java.util.Iterator;
     private final NavigationAnimator animator;
     private final ReactViewCreator topBarButtonCreator;
     private final TitleBarReactViewCreator titleBarReactViewCreator;
+    private TopBarBackgroundViewCreator topBarBackgroundViewCreator;
 
-    public StackController(final Activity activity, ReactViewCreator topBarButtonCreator, TitleBarReactViewCreator titleBarReactViewCreator, String id, Options initialOptions) {
+    public StackController(final Activity activity, ReactViewCreator topBarButtonCreator, TitleBarReactViewCreator titleBarReactViewCreator, TopBarBackgroundViewCreator topBarBackgroundViewCreator, String id, Options initialOptions) {
         super(activity, id, initialOptions);
         animator = createAnimator();
         this.topBarButtonCreator = topBarButtonCreator;
         this.titleBarReactViewCreator = titleBarReactViewCreator;
+        this.topBarBackgroundViewCreator = topBarBackgroundViewCreator;
     }
 
     public void applyOptions(Options options) {
     @NonNull
     @Override
     protected StackLayout createView() {
-        return new StackLayout(getActivity(), topBarButtonCreator, titleBarReactViewCreator, this::sendOnNavigationButtonPressed);
+        return new StackLayout(getActivity(), topBarButtonCreator, titleBarReactViewCreator, topBarBackgroundViewCreator, this::sendOnNavigationButtonPressed);
     }
 
     @NonNull

lib/android/app/src/main/java/com/reactnativenavigation/views/StackLayout.java

 import com.reactnativenavigation.viewcontrollers.ReactViewCreator;
 import com.reactnativenavigation.viewcontrollers.TopBarButtonController;
 import com.reactnativenavigation.views.titlebar.TitleBarReactViewCreator;
+import com.reactnativenavigation.views.topbar.TopBarBackgroundViewCreator;
 
 import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;
 import static android.view.ViewGroup.LayoutParams.WRAP_CONTENT;
     private TopBar topBar;
     private final OptionsPresenter optionsPresenter;
 
-    public StackLayout(Context context, ReactViewCreator topBarButtonCreator, TitleBarReactViewCreator titleBarReactViewCreator, TopBarButtonController.OnClickListener topBarButtonClickListener) {
+    public StackLayout(Context context, ReactViewCreator topBarButtonCreator, TitleBarReactViewCreator titleBarReactViewCreator, TopBarBackgroundViewCreator topBarBackgroundViewCreator, TopBarButtonController.OnClickListener topBarButtonClickListener) {
         super(context);
-        createLayout(topBarButtonCreator, titleBarReactViewCreator, topBarButtonClickListener);
+        createLayout(topBarButtonCreator, titleBarReactViewCreator, topBarBackgroundViewCreator, topBarButtonClickListener);
         optionsPresenter = new OptionsPresenter(topBar);
         setContentDescription("StackLayout");
     }
 
-    private void createLayout(ReactViewCreator topBarButtonCreator, TitleBarReactViewCreator titleBarReactViewCreator, TopBarButtonController.OnClickListener topBarButtonClickListener) {
-        topBar = new TopBar(getContext(), topBarButtonCreator, titleBarReactViewCreator, topBarButtonClickListener, this);
+    private void createLayout(ReactViewCreator buttonCreator, TitleBarReactViewCreator titleBarReactViewCreator, TopBarBackgroundViewCreator BackgroundViewCreator, TopBarButtonController.OnClickListener topBarButtonClickListener) {
+        topBar = new TopBar(getContext(), buttonCreator, titleBarReactViewCreator, BackgroundViewCreator, topBarButtonClickListener, this);
         topBar.setId(CompatUtils.generateViewId());
         addView(topBar, MATCH_PARENT, WRAP_CONTENT);
     }

lib/android/app/src/main/java/com/reactnativenavigation/views/TopBar.java

 import android.widget.RelativeLayout;
 import android.widget.TextView;
 
+import com.reactnativenavigation.R;
 import com.reactnativenavigation.anim.AnimationListener;
 import com.reactnativenavigation.anim.TopBarAnimator;
 import com.reactnativenavigation.anim.TopBarCollapseBehavior;
 import com.reactnativenavigation.interfaces.ScrollEventListener;
 import com.reactnativenavigation.parse.AnimationOptions;
 import com.reactnativenavigation.parse.TitleOptions;
+import com.reactnativenavigation.parse.TopBarBackgroundOptions;
 import com.reactnativenavigation.parse.params.Button;
 import com.reactnativenavigation.parse.params.Color;
 import com.reactnativenavigation.parse.params.Fraction;
 import com.reactnativenavigation.viewcontrollers.TopBarButtonController;
 import com.reactnativenavigation.views.titlebar.TitleBar;
 import com.reactnativenavigation.views.titlebar.TitleBarReactViewCreator;
+import com.reactnativenavigation.views.topbar.TopBarBackgroundView;
+import com.reactnativenavigation.views.topbar.TopBarBackgroundViewCreator;
 
 import java.util.List;
 
     private TopTabs topTabs;
     private RelativeLayout root;
     private StackLayout parentView;
+    private TopBarBackgroundViewCreator topBarBackgroundViewCreator;
 
-    public TopBar(final Context context, ReactViewCreator buttonCreator, TitleBarReactViewCreator titleBarReactViewCreator, TopBarButtonController.OnClickListener onClickListener, StackLayout parentView) {
+    public TopBar(final Context context, ReactViewCreator buttonCreator, TitleBarReactViewCreator titleBarReactViewCreator, TopBarBackgroundViewCreator topBarBackgroundViewCreator, TopBarButtonController.OnClickListener onClickListener, StackLayout parentView) {
         super(context);
         collapsingBehavior = new TopBarCollapseBehavior(this);
-        animator = new TopBarAnimator(this);
+        this.topBarBackgroundViewCreator = topBarBackgroundViewCreator;
         this.parentView = parentView;
+        animator = new TopBarAnimator(this);
         createLayout(buttonCreator, titleBarReactViewCreator, onClickListener);
     }
 
         titleBar.setComponent(componentName, alignment);
     }
 
+    public void setBackgroundComponent(TopBarBackgroundOptions options) {
+        if (options.component.hasValue()) {
+            TopBarBackgroundView background = topBarBackgroundViewCreator.create((Activity) getContext(), String.valueOf(CompatUtils.generateViewId()), options.component.get());
+            background.setId(R.id.topBarBackgroundComponent);
+            root.addView(background);
+        }
+    }
+
     public void setTopTabFontFamily(int tabIndex, Typeface fontFamily) {
         topTabs.setFontFamily(tabIndex, fontFamily);
     }

lib/android/app/src/main/java/com/reactnativenavigation/views/topbar/TopBarBackgroundView.java

+package com.reactnativenavigation.views.topbar;
+
+import android.annotation.SuppressLint;
+import android.content.Context;
+
+import com.facebook.react.ReactInstanceManager;
+import com.reactnativenavigation.react.ReactView;
+
+@SuppressLint("ViewConstructor")
+public class TopBarBackgroundView extends ReactView {
+
+    public TopBarBackgroundView(Context context, ReactInstanceManager reactInstanceManager, String componentId, String componentName) {
+        super(context, reactInstanceManager, componentId, componentName);
+    }
+
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        super.onMeasure(
+                getChildCount() > 0 ? MeasureSpec.makeMeasureSpec(getChildAt(0).getWidth(), MeasureSpec.EXACTLY) : widthMeasureSpec,
+                heightMeasureSpec
+        );
+    }
+}

lib/android/app/src/main/java/com/reactnativenavigation/views/topbar/TopBarBackgroundViewCreator.java

+package com.reactnativenavigation.views.topbar;
+
+import android.app.Activity;
+
+import com.facebook.react.ReactInstanceManager;
+import com.reactnativenavigation.viewcontrollers.ReactViewCreator;
+
+public class TopBarBackgroundViewCreator implements ReactViewCreator {
+
+    protected ReactInstanceManager instanceManager;
+
+    public TopBarBackgroundViewCreator(ReactInstanceManager instanceManager) {
+        this.instanceManager = instanceManager;
+	}
+
+	@Override
+	public TopBarBackgroundView create(Activity activity, String componentId, String componentName) {
+        return new TopBarBackgroundView(activity, instanceManager, componentId, componentName);
+    }
+}

lib/android/app/src/main/res/values/ids.xml

 <resources>
     <item name="react_root_view" type="id"/>
     <item name="fragment_screen_content" type="id"/>
+    <item name="topBarBackgroundComponent" type="id"/>
 </resources>

lib/android/app/src/test/java/com/reactnativenavigation/mocks/TopBarBackgroundViewCreatorMock.java

+package com.reactnativenavigation.mocks;
+
+import android.app.Activity;
+
+import com.facebook.react.ReactInstanceManager;
+import com.reactnativenavigation.views.topbar.TopBarBackgroundView;
+import com.reactnativenavigation.views.topbar.TopBarBackgroundViewCreator;
+
+import static org.mockito.Mockito.mock;
+
+public class TopBarBackgroundViewCreatorMock extends TopBarBackgroundViewCreator {
+    public TopBarBackgroundViewCreatorMock() {
+        super(mock(ReactInstanceManager.class));
+    }
+
+    @Override
+    public TopBarBackgroundView create(Activity activity, String componentId, String componentName) {
+        return new TopBarBackgroundView(activity, instanceManager, componentId, componentName);
+    }
+}

lib/android/app/src/test/java/com/reactnativenavigation/viewcontrollers/BottomTabsControllerTest.java

 import com.reactnativenavigation.mocks.MockPromise;
 import com.reactnativenavigation.mocks.SimpleViewController;
 import com.reactnativenavigation.mocks.TitleBarReactViewCreatorMock;
+import com.reactnativenavigation.mocks.TopBarBackgroundViewCreatorMock;
 import com.reactnativenavigation.mocks.TopBarButtonCreatorMock;
 import com.reactnativenavigation.parse.Options;
 import com.reactnativenavigation.parse.params.Color;
     }
 
     private StackController createStack(String id) {
-        return new StackController(activity, new TopBarButtonCreatorMock(), new TitleBarReactViewCreatorMock(), id, tabOptions);
+        return new StackController(activity, new TopBarButtonCreatorMock(), new TitleBarReactViewCreatorMock(), new TopBarBackgroundViewCreatorMock(), id, tabOptions);
     }
 }

lib/android/app/src/test/java/com/reactnativenavigation/viewcontrollers/ComponentViewControllerTest.java

 import com.reactnativenavigation.mocks.TestComponentLayout;
 import com.reactnativenavigation.mocks.TestReactView;
 import com.reactnativenavigation.mocks.TitleBarReactViewCreatorMock;
+import com.reactnativenavigation.mocks.TopBarBackgroundViewCreatorMock;
 import com.reactnativenavigation.mocks.TopBarButtonCreatorMock;
 import com.reactnativenavigation.parse.Options;
 import com.reactnativenavigation.views.StackLayout;
         super.beforeEach();
         Activity activity = newActivity();
         view = spy(new TestComponentLayout(activity, new TestReactView(activity)));
-        ParentController<StackLayout> parentController = new StackController(activity, new TopBarButtonCreatorMock(), new TitleBarReactViewCreatorMock(), "stack", new Options());
+        ParentController<StackLayout> parentController = new StackController(activity, new TopBarButtonCreatorMock(), new TitleBarReactViewCreatorMock(), new TopBarBackgroundViewCreatorMock(), "stack", new Options());
         uut = new ComponentViewController(activity, "componentId1", "componentName", (activity1, componentId, componentName) -> view, new Options());
         uut.setParentController(parentController);
         parentController.ensureViewIsCreated();

lib/android/app/src/test/java/com/reactnativenavigation/viewcontrollers/FloatingActionButtonTest.java

 import com.reactnativenavigation.mocks.MockPromise;
 import com.reactnativenavigation.mocks.SimpleViewController;
 import com.reactnativenavigation.mocks.TitleBarReactViewCreatorMock;
+import com.reactnativenavigation.mocks.TopBarBackgroundViewCreatorMock;
 import com.reactnativenavigation.mocks.TopBarButtonCreatorMock;
 import com.reactnativenavigation.parse.FabOptions;
 import com.reactnativenavigation.parse.Options;
     public void beforeEach() {
         super.beforeEach();
         activity = newActivity();
-        stackController = new StackController(activity, new TopBarButtonCreatorMock(), new TitleBarReactViewCreatorMock(), "stackController", new Options());
+        stackController = new StackController(activity, new TopBarButtonCreatorMock(), new TitleBarReactViewCreatorMock(), new TopBarBackgroundViewCreatorMock(),"stackController", new Options());
         Options options = getOptionsWithFab();
         childFab = new SimpleViewController(activity, "child1", options);
         childNoFab = new SimpleViewController(activity, "child2", new Options());

lib/android/app/src/test/java/com/reactnativenavigation/viewcontrollers/NavigatorTest.java

 import com.reactnativenavigation.mocks.SimpleComponentViewController;
 import com.reactnativenavigation.mocks.SimpleViewController;
 import com.reactnativenavigation.mocks.TitleBarReactViewCreatorMock;
+import com.reactnativenavigation.mocks.TopBarBackgroundViewCreatorMock;
 import com.reactnativenavigation.mocks.TopBarButtonCreatorMock;
 import com.reactnativenavigation.parse.Options;
 import com.reactnativenavigation.parse.params.Text;
 
     @NonNull
     private StackController newStack() {
-        return new StackController(activity, new TopBarButtonCreatorMock(), new TitleBarReactViewCreatorMock(), "stack" + CompatUtils.generateViewId(), tabOptions);
+        return new StackController(activity, new TopBarButtonCreatorMock(), new TitleBarReactViewCreatorMock(), new TopBarBackgroundViewCreatorMock(), "stack" + CompatUtils.generateViewId(), tabOptions);
     }
 
     @Test

lib/android/app/src/test/java/com/reactnativenavigation/viewcontrollers/OptionsApplyingTest.java

 import com.reactnativenavigation.mocks.TestComponentLayout;
 import com.reactnativenavigation.mocks.TestReactView;
 import com.reactnativenavigation.mocks.TitleBarReactViewCreatorMock;
+import com.reactnativenavigation.mocks.TopBarBackgroundViewCreatorMock;
 import com.reactnativenavigation.mocks.TopBarButtonCreatorMock;
 import com.reactnativenavigation.parse.Options;
 import com.reactnativenavigation.parse.params.Bool;
                 (activity1, componentId, componentName) -> view,
                 initialNavigationOptions
         );
-        stackController = new StackController(activity, new TopBarButtonCreatorMock(), new TitleBarReactViewCreatorMock(), "stack", new Options());
+        stackController = new StackController(activity, new TopBarButtonCreatorMock(), new TitleBarReactViewCreatorMock(), new TopBarBackgroundViewCreatorMock(), "stack", new Options());
         stackController.ensureViewIsCreated();
         uut.setParentController(stackController);
     }
     @Test
     public void initialOptionsAppliedOnAppear() throws Exception {
         uut.options.topBarOptions.title.text = new Text("the title");
-        StackController stackController = new StackController(activity, new TopBarButtonCreatorMock(), new TitleBarReactViewCreatorMock(), "stackId", new Options());
+        StackController stackController = new StackController(activity, new TopBarButtonCreatorMock(), new TitleBarReactViewCreatorMock(), new TopBarBackgroundViewCreatorMock(), "stackId", new Options());
         stackController.animatePush(uut, new MockPromise() {});
         assertThat(stackController.getTopBar().getTitle()).isEmpty();
 

lib/android/app/src/test/java/com/reactnativenavigation/viewcontrollers/ParentControllerTest.java

 import com.reactnativenavigation.mocks.MockPromise;
 import com.reactnativenavigation.mocks.SimpleViewController;
 import com.reactnativenavigation.mocks.TitleBarReactViewCreatorMock;
+import com.reactnativenavigation.mocks.TopBarBackgroundViewCreatorMock;
 import com.reactnativenavigation.mocks.TopBarButtonCreatorMock;
 import com.reactnativenavigation.parse.Options;
 import com.reactnativenavigation.parse.params.Text;
     }
 
     private StackController createStack() {
-        return new StackController(activity, new TopBarButtonCreatorMock(), new TitleBarReactViewCreatorMock(), "stack", new Options());
+        return new StackController(activity, new TopBarButtonCreatorMock(), new TitleBarReactViewCreatorMock(), new TopBarBackgroundViewCreatorMock(),"stack", new Options());
     }
 }

lib/android/app/src/test/java/com/reactnativenavigation/viewcontrollers/StackControllerTest.java

 import com.reactnativenavigation.mocks.MockPromise;
 import com.reactnativenavigation.mocks.SimpleViewController;
 import com.reactnativenavigation.mocks.TitleBarReactViewCreatorMock;
+import com.reactnativenavigation.mocks.TopBarBackgroundViewCreatorMock;
 import com.reactnativenavigation.mocks.TopBarButtonCreatorMock;
 import com.reactnativenavigation.parse.NestedAnimationsOptions;
 import com.reactnativenavigation.parse.Options;
     public void beforeEach() {
         super.beforeEach();
         activity = newActivity();
-        uut = createStackController("uut");
+        uut = createStackController();
         child1 = spy(new SimpleViewController(activity, "child1", new Options()));
         child2 = spy(new SimpleViewController(activity, "child2", new Options()));
         child3 = spy(new SimpleViewController(activity, "child3", new Options()));
     @Test
     public void pop_layoutHandlesChildWillDisappear() throws Exception {
         final StackLayout[] stackLayout = new StackLayout[1];
-        uut = new StackController(activity, new TopBarButtonCreatorMock(), new TitleBarReactViewCreatorMock(), "uut", new Options()) {
+        uut = new StackController(activity, new TopBarButtonCreatorMock(), new TitleBarReactViewCreatorMock(), new TopBarBackgroundViewCreatorMock(), "uut", new Options()) {
             @NonNull
             @Override
             protected StackLayout createView() {
 
     @Test
     public void findControllerById_Deeply() throws Exception {
-        StackController stack = createStackController("stack2");
+        StackController stack = createStackController("another");
         stack.animatePush(child2, new MockPromise());
         uut.animatePush(stack, new MockPromise());
         assertThat(uut.findControllerById(child2.getId())).isEqualTo(child2);
     @Test
     public void mergeChildOptions_updatesViewWithNewOptions() throws Exception {
         final StackLayout[] stackLayout = new StackLayout[1];
-        StackController uut = new StackController(activity, new TopBarButtonCreatorMock(), new TitleBarReactViewCreatorMock(), "stack", new Options()) {
+        StackController uut = new StackController(activity, new TopBarButtonCreatorMock(), new TitleBarReactViewCreatorMock(), new TopBarBackgroundViewCreatorMock(), "stack", new Options()) {
             @NonNull
             @Override
             protected StackLayout createView() {
     @Test
     public void mergeChildOptions_updatesParentControllerWithNewOptions() throws Exception {
         final StackLayout[] stackLayout = new StackLayout[1];
-        StackController uut = new StackController(activity, new TopBarButtonCreatorMock(), new TitleBarReactViewCreatorMock(), "stack", new Options()) {
+        StackController uut = new StackController(activity, new TopBarButtonCreatorMock(), new TitleBarReactViewCreatorMock(), new TopBarBackgroundViewCreatorMock(), "stack", new Options()) {
             @NonNull
             @Override
             protected StackLayout createView() {
         assertThat(uut.getChildControllers()).extracting((Extractor<ViewController, String>) ViewController::getId).containsOnly(ids);
     }
 
+    private StackController createStackController() {
+        return createStackController("stackId");
+    }
+
     private StackController createStackController(String id) {
-        return new StackController(activity, new TopBarButtonCreatorMock(), new TitleBarReactViewCreatorMock(), id, new Options()) {
+        return new StackController(activity, new TopBarButtonCreatorMock(), new TitleBarReactViewCreatorMock(), new TopBarBackgroundViewCreatorMock(), id, new Options()) {
             @Override
             NavigationAnimator createAnimator() {
                 animator = Mockito.mock(NavigationAnimator.class);

lib/android/app/src/test/java/com/reactnativenavigation/viewcontrollers/TopBarButtonControllerTest.java

 
 import com.reactnativenavigation.BaseTest;
 import com.reactnativenavigation.mocks.TitleBarReactViewCreatorMock;
+import com.reactnativenavigation.mocks.TopBarBackgroundViewCreatorMock;
 import com.reactnativenavigation.mocks.TopBarButtonCreatorMock;
 import com.reactnativenavigation.parse.Options;
 import com.reactnativenavigation.parse.params.Button;
 
         TopBarButtonCreatorMock buttonCreatorMock = new TopBarButtonCreatorMock();
         uut = spy(new TopBarButtonController(activity, button, buttonCreatorMock, (buttonId) -> {}));
-        stackController = spy(new StackController(activity, buttonCreatorMock, new TitleBarReactViewCreatorMock(), "stack", new Options()));
+        stackController = spy(new StackController(activity, buttonCreatorMock, new TitleBarReactViewCreatorMock(), new TopBarBackgroundViewCreatorMock(), "stack", new Options()));
 
     }
 

lib/android/app/src/test/java/com/reactnativenavigation/viewcontrollers/TopTabsViewControllerTest.java

 import com.reactnativenavigation.mocks.TestComponentViewCreator;
 import com.reactnativenavigation.mocks.TestReactView;
 import com.reactnativenavigation.mocks.TitleBarReactViewCreatorMock;
+import com.reactnativenavigation.mocks.TopBarBackgroundViewCreatorMock;
 import com.reactnativenavigation.mocks.TopBarButtonCreatorMock;
 import com.reactnativenavigation.parse.Options;
 import com.reactnativenavigation.parse.params.Text;
 
     @NonNull
     private StackController createStackController(String id) {
-        return new StackController(activity, new TopBarButtonCreatorMock(), new TitleBarReactViewCreatorMock(), id, new Options());
+        return new StackController(activity, new TopBarButtonCreatorMock(), new TitleBarReactViewCreatorMock(), new TopBarBackgroundViewCreatorMock(), id, new Options());
     }
 
     @NonNull

lib/android/app/src/test/java/com/reactnativenavigation/viewcontrollers/ViewControllerTest.java

 import com.reactnativenavigation.mocks.MockPromise;
 import com.reactnativenavigation.mocks.SimpleViewController;
 import com.reactnativenavigation.mocks.TitleBarReactViewCreatorMock;
+import com.reactnativenavigation.mocks.TopBarBackgroundViewCreatorMock;
 import com.reactnativenavigation.mocks.TopBarButtonCreatorMock;
 import com.reactnativenavigation.parse.Options;
 
     @Test
     public void holdsAReferenceToStackControllerOrNull() throws Exception {
         assertThat(uut.getParentController()).isNull();
-        StackController nav = new StackController(activity, new TopBarButtonCreatorMock(), new TitleBarReactViewCreatorMock(), "stack", new Options());
+        StackController nav = new StackController(activity, new TopBarButtonCreatorMock(), new TitleBarReactViewCreatorMock(), new TopBarBackgroundViewCreatorMock(), "stack", new Options());
         nav.animatePush(uut, new MockPromise());
         assertThat(uut.getParentController()).isEqualTo(nav);
     }

lib/android/app/src/test/java/com/reactnativenavigation/views/TopBarBackgroundComponentTest.java

+package com.reactnativenavigation.views;
+
+import android.util.Log;
+
+import com.reactnativenavigation.BaseTest;
+import com.reactnativenavigation.R;
+import com.reactnativenavigation.mocks.TitleBarReactViewCreatorMock;
+import com.reactnativenavigation.mocks.TopBarBackgroundViewCreatorMock;
+import com.reactnativenavigation.mocks.TopBarButtonCreatorMock;
+import com.reactnativenavigation.parse.TopBarBackgroundOptions;
+import com.reactnativenavigation.parse.params.Text;
+import com.reactnativenavigation.react.ReactView;
+import com.reactnativenavigation.viewcontrollers.TopBarButtonController;
+
+import org.junit.Test;
+
+import static org.assertj.core.api.Java6Assertions.assertThat;
+import static org.mockito.Mockito.spy;
+
+public class TopBarBackgroundComponentTest extends BaseTest {
+    private TopBar uut;
+
+    @SuppressWarnings("Convert2Lambda")
+    @Override
+    public void beforeEach() {
+        TopBarButtonController.OnClickListener onClickListener = spy(new TopBarButtonController.OnClickListener() {
+            @Override
+            public void onPress(String buttonId) {
+                Log.i("TopBarTest", "onPress: " + buttonId);
+            }
+        });
+        StackLayout parent = new StackLayout(newActivity(), new TopBarButtonCreatorMock(), new TitleBarReactViewCreatorMock(), new TopBarBackgroundViewCreatorMock(), onClickListener);
+        uut = new TopBar(newActivity(), new TopBarButtonCreatorMock(), new TitleBarReactViewCreatorMock(), new TopBarBackgroundViewCreatorMock(), onClickListener, parent);
+        parent.addView(uut);
+    }
+
+    @Test
+    public void setBackgroundComponent() throws Exception {
+        TopBarBackgroundOptions options = new TopBarBackgroundOptions();
+        options.component = new Text("someComponent");
+        uut.setBackgroundComponent(options);
+        assertThat(ReactView.class.isAssignableFrom(uut.findViewById(R.id.topBarBackgroundComponent).getClass())).isTrue();
+    }
+
+    @Test
+    public void setBackgroundComponent_doesNotSetIfNoComponentIsDefined() throws Exception {
+        TopBarBackgroundOptions options = new TopBarBackgroundOptions();
+        uut.setBackgroundComponent(options);
+        assertThat(uut.findViewById(R.id.topBarBackgroundComponent)).isNull();
+    }
+}

lib/android/app/src/test/java/com/reactnativenavigation/views/TopBarTest.java

 import com.reactnativenavigation.BaseTest;
 import com.reactnativenavigation.anim.TopBarAnimator;
 import com.reactnativenavigation.mocks.TitleBarReactViewCreatorMock;
+import com.reactnativenavigation.mocks.TopBarBackgroundViewCreatorMock;
 import com.reactnativenavigation.mocks.TopBarButtonCreatorMock;
 import com.reactnativenavigation.parse.AnimationOptions;
 import com.reactnativenavigation.parse.params.Button;
     private ArrayList<Button> rightButtons;
     private TopBarButtonController.OnClickListener onClickListener;
 
+    @SuppressWarnings("Convert2Lambda")
     @Override
     public void beforeEach() {
         onClickListener = spy(new TopBarButtonController.OnClickListener() {
                 Log.i("TopBarTest", "onPress: " + buttonId);
             }
         });
-        StackLayout parent = new StackLayout(newActivity(), new TopBarButtonCreatorMock(), new TitleBarReactViewCreatorMock(), this.onClickListener);
-        uut = new TopBar(newActivity(), new TopBarButtonCreatorMock(), new TitleBarReactViewCreatorMock(), this.onClickListener, parent);
+        StackLayout parent = new StackLayout(newActivity(), new TopBarButtonCreatorMock(), new TitleBarReactViewCreatorMock(), new TopBarBackgroundViewCreatorMock(), this.onClickListener);
+        uut = new TopBar(newActivity(), new TopBarButtonCreatorMock(), new TitleBarReactViewCreatorMock(), new TopBarBackgroundViewCreatorMock(), this.onClickListener, parent);
         animator = spy(new TopBarAnimator(uut));
         uut.setAnimator(animator);
         leftButton = createLeftButton();