some more styles

android/app/src/main/java/com/reactnativenavigation/layouts/ScreenLayout.java

 import com.reactnativenavigation.utils.SdkSupports;
 import com.reactnativenavigation.views.ContentView;
 import com.reactnativenavigation.views.ScrollDirectionListener;
-import com.reactnativenavigation.views.TitleBar;
 import com.reactnativenavigation.views.TitleBarButton;
 
 import java.util.List;
 
     private void createViews() {
         addTopBar();
-        addTitleBarAndSetButtons();
+        topBar.addTitleBarAndSetButtons(buttons);
         addContentView();
     }
 
-    private void addTitleBarAndSetButtons() {
-        TitleBar titleBar = new TitleBar(getContext());
-        titleBar.setButtons(buttons);
-        topBar.addView(titleBar);
-    }
-
     private void addTopBar() {
         topBar = new TopBar(getContext());
         addView(topBar, new LinearLayout.LayoutParams(MATCH_PARENT, WRAP_CONTENT));
         setStatusBarColor(styleParams.statusBarColor);
         setTopBarColor(styleParams.topBarColor);
         setNavigationBarColor(styleParams.navigationBarColor);
-        setTitleBarHidden(styleParams.titleBarHidden);
+        topBar.setTitleBarVisibility(styleParams.titleBarHidden);
+        topBar.setVisibility(styleParams.topBarHidden ? GONE : VISIBLE);
+
     }
 
     @TargetApi(Build.VERSION_CODES.LOLLIPOP)
         }
     }
 
-    private void setTitleBarHidden(boolean titleBarHidden) {
-        if (titleBarHidden) {
-            
-        }
-    }
-
     @Override
     public void onScrollChanged(ScrollDirectionListener.Direction direction) {
 

android/app/src/main/java/com/reactnativenavigation/layouts/TopBar.java

 import android.content.Context;
 import android.support.design.widget.AppBarLayout;
 
+import com.reactnativenavigation.views.TitleBar;
+import com.reactnativenavigation.views.TitleBarButton;
+
+import java.util.List;
+
 public class TopBar extends AppBarLayout {
 
+    private TitleBar titleBar;
+
     public TopBar(Context context) {
         super(context);
         setFitsSystemWindows(true);
     }
+
+    public void addTitleBarAndSetButtons(List<TitleBarButton.Params> buttons) {
+        titleBar = new TitleBar(getContext());
+        titleBar.setButtons(buttons);
+    }
+
+    public void setTitleBarVisibility(boolean isHidden) {
+        titleBar.setVisibility(isHidden ? GONE : VISIBLE);
+    }
 }