Add support for white colors :)

android/app/src/main/java/com/reactnativenavigation/params/StyleParams.java

 public class StyleParams {
     public static class Color {
         @ColorInt
-        private int color = -1;
+        private Integer color = null;
 
-        public Color(int color) {
+        public Color() {
+            color = null;
+        }
+
+        public Color(Integer color) {
             this.color = color;
         }
 
         public boolean hasColor() {
-            return color != -1;
+            return color != null;
         }
 
         public int getColor() {
             }
             return color;
         }
+
+        public static Color parse(String str) {
+            if (str == null) {
+                return new Color();
+            }
+            return new Color(android.graphics.Color.parseColor(str));
+        }
     }
 
     public Color statusBarColor;

android/app/src/main/java/com/reactnativenavigation/params/parsers/ActivityParamsParser.java

 import android.os.Bundle;
 
 import com.reactnativenavigation.params.ActivityParams;
-import com.reactnativenavigation.params.StyleParams;
 
 public class ActivityParamsParser extends Parser {
     public static ActivityParams parse(Bundle params) {

android/app/src/main/java/com/reactnativenavigation/params/parsers/ColorParser.java

-package com.reactnativenavigation.params.parsers;
-
-import android.graphics.Color;
-import android.support.annotation.ColorInt;
-
-//TODO move to JS
-public class ColorParser {
-    @ColorInt
-    public static int parse(String str) {
-        if (str == null) {
-            return -1;
-        }
-        return Color.parseColor(str);
-    }
-}

android/app/src/main/java/com/reactnativenavigation/params/parsers/StyleParamsParser.java

         result.topBarColor = getColor("topBarColor", getDefaultTopBarColor());
         result.titleBarHidden = getBoolean("titleBarHidden", isDefaultTopBarHidden());
         result.titleBarTitleColor = getColor("titleBarTitleColor", getDefaultTitleBarColor());
-        result.titleBarButtonColor = getColor("titleBarButtonColor", getDefaultTitleBarColor());
+        result.titleBarButtonColor = getColor("titleBarButtonColor", getTitleBarButtonColor());
         result.backButtonHidden = getBoolean("backButtonHidden", isDefaultBackButtonHidden());
         result.topTabsHidden = getBoolean("topTabsHidden", isDefaultTopTabsHidden());
 
 
     @Nullable
     private StyleParams.Color getDefaultNavigationColor() {
-        return appStyle == null ? new StyleParams.Color(-1) : appStyle.navigationBarColor;
+        return appStyle == null ? new StyleParams.Color() : appStyle.navigationBarColor;
     }
 
     @Nullable
     private StyleParams.Color getDefaultSelectedBottomTabsButtonColor() {
-        return appStyle == null ? new StyleParams.Color(-1) : appStyle.selectedBottomTabsButtonColor;
+        return appStyle == null ? new StyleParams.Color() : appStyle.selectedBottomTabsButtonColor;
     }
 
     @Nullable
     private StyleParams.Color getDefaultBottomTabsButtonColor() {
-        return appStyle == null ? new StyleParams.Color(-1) : appStyle.bottomTabsButtonColor;
+        return appStyle == null ? new StyleParams.Color() : appStyle.bottomTabsButtonColor;
     }
 
     @Nullable
     private StyleParams.Color getDefaultBottomTabsColor() {
-        return appStyle == null ? new StyleParams.Color(-1) : appStyle.bottomTabsColor;
+        return appStyle == null ? new StyleParams.Color() : appStyle.bottomTabsColor;
     }
 
     private boolean isDefaultBottomTabsHiddenOnScroll() {
 
     @Nullable
     private StyleParams.Color getDefaultTitleBarColor() {
-        return appStyle == null ? new StyleParams.Color(-1) : appStyle.titleBarTitleColor;
+        return appStyle == null ? new StyleParams.Color() : appStyle.titleBarTitleColor;
     }
 
     @Nullable
     private StyleParams.Color getTitleBarButtonColor() {
-        return appStyle == null ? new StyleParams.Color(-1) : appStyle.titleBarButtonColor;
+        return appStyle == null ? new StyleParams.Color() : appStyle.titleBarButtonColor;
     }
 
     private boolean isDefaultTopBarHidden() {
 
     @Nullable
     private StyleParams.Color getDefaultTopBarColor() {
-        return appStyle == null ? new StyleParams.Color(-1) : appStyle.topBarColor;
+        return appStyle == null ? new StyleParams.Color() : appStyle.topBarColor;
     }
 
     @Nullable
     private StyleParams.Color getDefaultStatusBarColor() {
-        return appStyle == null ? new StyleParams.Color(-1) : appStyle.statusBarColor;
+        return appStyle == null ? new StyleParams.Color() : appStyle.statusBarColor;
     }
 
     private boolean getBoolean(String titleBarHidden, boolean defaultValue) {
 
     @NonNull
     private StyleParams.Color getColor(String key, StyleParams.Color defaultColor) {
-        StyleParams.Color color = new StyleParams.Color(ColorParser.parse(params.getString(key)));
+        StyleParams.Color color = StyleParams.Color.parse(params.getString(key));
         if (color.hasColor()) {
             return color;
         } else {

android/app/src/main/java/com/reactnativenavigation/params/parsers/TitleBarButtonParamsParser.java

         if (hasKey(bundle,"icon")) {
             result.icon = ImageLoader.loadImage(bundle.getString("icon"));
         }
-        result.color = new StyleParams.Color(ColorParser.parse(bundle.getString("color")));
+        result.color = StyleParams.Color.parse(bundle.getString("color"));
         result.showAsAction = parseShowAsAction(bundle.getString("showAsAction"));
         result.enabled = bundle.getBoolean("enabled", true);
         result.eventId = bundle.getString("id");

src/deprecated/platformSpecificDeprecated.android.js

   });
 
   params.appStyle = convertStyleParams(params.appStyle);
-
-  console.log('appStyle.bottomTabsButtonColor', params.appStyle.bottomTabsButtonColor);
-  console.log('appStyle.bottomTabsColor', params.appStyle.bottomTabsColor);
-  console.log('appStyle.selectedBottomTabsButtonColor', params.appStyle.selectedBottomTabsButtonColor);
-
   // TODO: add drawer params
   newPlatformSpecific.startApp(params);
 }