try to make scroll anim work

android/app/build.gradle

@@ -50,4 +50,7 @@ dependencies {
     compile "com.android.support:appcompat-v7:23.0.1"
     compile 'com.android.support:design:23.1.1'
     compile "com.facebook.react:react-native:+"  // From node_modules
+
+    testCompile "junit:junit:4.12"
+    testCompile "org.robolectric:robolectric:3.1.1"
 }

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

@@ -33,7 +33,7 @@ public class HideOnScrollAnimator {
 
     public void onScrollChanged(ScrollDirectionListener.Direction scrollDirection) {
         if (hideDirection == HideDirection.Down) {
-            handleDownHidingViews(scrollDirection); //TODO better name
+            handleDownHidingViews(scrollDirection);
         } else {
             handleUpHidingViews(scrollDirection);
         }

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

@@ -5,10 +5,12 @@ import android.app.Activity;
 import android.content.Context;
 import android.graphics.Color;
 import android.os.Build;
+import android.util.Log;
 import android.view.View;
 import android.view.Window;
 import android.widget.LinearLayout;
 
+import com.reactnativenavigation.animation.HideOnScrollAnimator;
 import com.reactnativenavigation.params.ScreenParams;
 import com.reactnativenavigation.params.ScreenStyleParams;
 import com.reactnativenavigation.utils.SdkSupports;
@@ -24,6 +26,7 @@ public class ScreenImpl extends LinearLayout implements Screen, ScrollDirectionL
     private final ScreenParams screenParams;
     private ContentView contentView;
     private TopBar topBar;
+    private HideOnScrollAnimator scrollAnimator;
 
     public ScreenImpl(Context context, ScreenParams screenParams) {
         super(context);
@@ -102,7 +105,11 @@ public class ScreenImpl extends LinearLayout implements Screen, ScrollDirectionL
 
     @Override
     public void onScrollChanged(ScrollDirectionListener.Direction direction) {
-        // TODO handle if needed
+        Log.d("TAG", "onScrollChanged: ");
+        if (scrollAnimator == null) {
+            scrollAnimator = new HideOnScrollAnimator(topBar, HideOnScrollAnimator.HideDirection.Up, topBar.getHeight());
+        }
+        scrollAnimator.onScrollChanged(direction);
     }
 
     @Override

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

@@ -1,5 +1,6 @@
 package com.reactnativenavigation.views;
 
+import android.util.Log;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ScrollView;
@@ -38,6 +39,7 @@ public class ScrollViewAttacher implements View.OnAttachStateChangeListener {
 
     private void findScrollAndStartListening() {
         scrollView = findScrollView(view);
+        Log.d("LOG", "ScrollViewAttacher.findScrollAndStartListening " + scrollView);
         if (scrollView != null) {
             scrollDirectionListener = new ScrollDirectionListener(scrollView, onChanged);
             scrollView.getViewTreeObserver().addOnScrollChangedListener(scrollDirectionListener);

example-redux/src/app.js

@@ -37,7 +37,7 @@ export default class App {
       case 'login':
         Navigation.startSingleScreenApp({
           screen: {
-            screen: 'example.FirstTabScreen',
+            screen: 'example.ListScreen',
             title: 'Login',
             navigatorStyle: {}
           },