animator on scroll

android/app/src/main/java/com/reactnativenavigation/animation/HideOnScrollAnimator.java

 import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
 import android.animation.ObjectAnimator;
-import android.support.annotation.NonNull;
 import android.support.v4.view.animation.LinearOutSlowInInterpolator;
 import android.view.View;
 
         return state == State.Hidden || state == State.AnimateHide;
     }
 
-    @NonNull
     private ObjectAnimator createAnimator(final boolean show) {
         ObjectAnimator animator = ObjectAnimator.ofFloat(view, View.TRANSLATION_Y, show ? shownEndValue : hiddenEndValue);
         animator.setDuration(DURATION);

android/app/src/main/java/com/reactnativenavigation/views/TitleBar.java

 import android.view.MenuInflater;
 
 import com.reactnativenavigation.R;
+import com.reactnativenavigation.animation.HideOnScrollAnimator;
 import com.reactnativenavigation.core.Button;
 
 import java.util.List;
     private Menu menu;
     private ActionMenuView actionMenuView;
     private boolean hideOnScroll = false;
+    private HideOnScrollAnimator hideOnScrollAnimator;
 
     public TitleBar(Context context) {
         super(context);
         createMenu();
+
     }
 
     private void createMenu() {
 
     public void onScrollChanged(ScrollDirectionListener.Direction direction) {
         if (hideOnScroll) {
-            //TODO animate hide/show
+            if (hideOnScrollAnimator == null) {
+                createScrollAnimator();
+            }
+            hideOnScrollAnimator.onScrollChanged(direction);
         }
     }
+
+    private void createScrollAnimator() {
+        hideOnScrollAnimator = new HideOnScrollAnimator(this, HideOnScrollAnimator.HideDirection.Up, getHeight());
+    }
 }