Support setting BottomTab text and icon dynamically with mergeOptions

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

                 parse(typefaceManager, node.getOptions()),
                 new Presenter(activity, defaultOptions),
                 new BottomTabsPresenter(tabs, defaultOptions),
-                new BottomTabPresenter(activity, tabs, defaultOptions));
+                new BottomTabPresenter(activity, tabs, new ImageLoader(), defaultOptions));
 	}
 
     private ViewController createTopTabs(LayoutNode node) {

lib/android/app/src/main/java/com/reactnativenavigation/presentation/BottomTabPresenter.java

 package com.reactnativenavigation.presentation;
 
 import android.content.Context;
+import android.graphics.drawable.Drawable;
+import android.support.annotation.NonNull;
 import android.support.annotation.VisibleForTesting;
 import android.support.v4.content.ContextCompat;
 
 import com.reactnativenavigation.parse.BottomTabOptions;
 import com.reactnativenavigation.parse.Options;
+import com.reactnativenavigation.utils.ImageLoader;
+import com.reactnativenavigation.utils.ImageLoadingListenerAdapter;
 import com.reactnativenavigation.viewcontrollers.ViewController;
 import com.reactnativenavigation.viewcontrollers.bottomtabs.BottomTabFinder;
 import com.reactnativenavigation.views.BottomTabs;
 import java.util.List;
 
 public class BottomTabPresenter {
+    private final Context context;
+    private ImageLoader imageLoader;
     private Options defaultOptions;
     private final BottomTabFinder bottomTabFinder;
     private BottomTabs bottomTabs;
     private final int defaultTextColor;
     private final List<ViewController> tabs;
 
-    public BottomTabPresenter(Context context, List<ViewController> tabs, Options defaultOptions) {
+    public BottomTabPresenter(Context context, List<ViewController> tabs, ImageLoader imageLoader, Options defaultOptions) {
         this.tabs = tabs;
+        this.context = context;
         this.bottomTabFinder = new BottomTabFinder(tabs);
+        this.imageLoader = imageLoader;
         this.defaultOptions = defaultOptions;
         defaultSelectedTextColor = defaultOptions.bottomTabOptions.selectedIconColor.get(ContextCompat.getColor(context, com.aurelhubert.ahbottomnavigation.R.color.colorBottomNavigationAccent));
         defaultTextColor = defaultOptions.bottomTabOptions.iconColor.get(ContextCompat.getColor(context, com.aurelhubert.ahbottomnavigation.R.color.colorBottomNavigationInactive));
     public void mergeChildOptions(Options options, Component child) {
         int index = bottomTabFinder.findByComponent(child);
         if (index >= 0) {
-            BottomTabOptions withDefaultOptions = options.withDefaultOptions(defaultOptions).bottomTabOptions;
-            if (withDefaultOptions.badge.hasValue()) bottomTabs.setBadge(index, withDefaultOptions.badge.get());
-            if (withDefaultOptions.badgeColor.hasValue()) bottomTabs.setBadgeColor(withDefaultOptions.badgeColor.get());
-            if (withDefaultOptions.fontFamily != null) bottomTabs.setTitleTypeface(index, withDefaultOptions.fontFamily);
-            if (withDefaultOptions.selectedIconColor.hasValue()) bottomTabs.setIconActiveColor(index, withDefaultOptions.selectedIconColor.get());
-            if (withDefaultOptions.iconColor.hasValue()) bottomTabs.setIconInactiveColor(index, withDefaultOptions.iconColor.get());
-            if (withDefaultOptions.selectedTextColor.hasValue()) bottomTabs.setTitleActiveColor(index, withDefaultOptions.selectedTextColor.get());
-            if (withDefaultOptions.textColor.hasValue()) bottomTabs.setTitleInactiveColor(index, withDefaultOptions.textColor.get());
+            BottomTabOptions bto = options.bottomTabOptions;
+            if (bto.badge.hasValue()) bottomTabs.setBadge(index, bto.badge.get());
+            if (bto.badgeColor.hasValue()) bottomTabs.setBadgeColor(bto.badgeColor.get());
+            if (bto.fontFamily != null) bottomTabs.setTitleTypeface(index, bto.fontFamily);
+            if (bto.selectedIconColor.hasValue()) bottomTabs.setIconActiveColor(index, bto.selectedIconColor.get());
+            if (bto.iconColor.hasValue()) bottomTabs.setIconInactiveColor(index, bto.iconColor.get());
+            if (bto.selectedTextColor.hasValue()) bottomTabs.setTitleActiveColor(index, bto.selectedTextColor.get());
+            if (bto.textColor.hasValue()) bottomTabs.setTitleInactiveColor(index, bto.textColor.get());
+            if (bto.text.hasValue()) bottomTabs.setText(index, bto.text.get());
+            if (bto.icon.hasValue()) imageLoader.loadIcon(context, bto.icon.get(), new ImageLoadingListenerAdapter() {
+                @Override
+                public void onComplete(@NonNull Drawable drawable) {
+                    bottomTabs.setIcon(index, drawable);
+                }
+            });
         }
     }
 

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

 
 import android.annotation.SuppressLint;
 import android.content.Context;
+import android.graphics.drawable.Drawable;
 import android.support.annotation.ColorInt;
 import android.support.annotation.IntRange;
 
 import com.aurelhubert.ahbottomnavigation.AHBottomNavigation;
+import com.aurelhubert.ahbottomnavigation.AHBottomNavigationItem;
 import com.reactnativenavigation.BuildConfig;
 import com.reactnativenavigation.parse.params.Text;
 import com.reactnativenavigation.utils.CompatUtils;
     public void setTitleState(TitleState titleState) {
         if (getTitleState() != titleState) super.setTitleState(titleState);
     }
+
+    public void setText(int index, String text) {
+        AHBottomNavigationItem item = getItem(index);
+        if (!item.getTitle(getContext()).equals(text)) {
+            item.setTitle(text);
+            refresh();
+        }
+    }
+
+    public void setIcon(int index, Drawable icon) {
+        AHBottomNavigationItem item = getItem(index);
+        if (!item.getDrawable(getContext()).equals(icon)) {
+            item.setDrawable(icon);
+            refresh();
+        }
+    }
 }

playground/src/screens/TextScreen.js

     );
   }
 
+  onClickSetBadge() {
+    Navigation.mergeOptions(this.props.componentId, {
+      bottomTab: {
+        badge: `TeSt`
+      }
+    });
+  }
+
   onClickPush = async () => {
     await Navigation.push(this.props.componentId, {
       component: {
     );
   }
 
-  onClickSetBadge() {
-    Navigation.mergeOptions(this.props.componentId, {
-      bottomTab: {
-        badge: `TeSt`
-      }
-    });
-  }
-
   onClickSwitchToTab() {
     Navigation.mergeOptions(this.props.componentId, {
       bottomTabs: {