Fixes AppBarLayout delayed init of elevation (#3601)

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

 
     private void applyTopBarOptions(TopBarOptions options, AnimationsOptions animationOptions, Component component, Options componentOptions) {
         topBar.setHeight(options.height.get(LayoutParams.WRAP_CONTENT));
-        topBar.setElevation(options.elevation);
+        topBar.setElevation(options.elevation.get(4d));
 
         topBar.setTitleHeight(options.title.height.get(LayoutParams.WRAP_CONTENT));
         topBar.setTitle(options.title.text.get(""));
 
     private void mergeTopBarOptions(TopBarOptions options, AnimationsOptions animationsOptions, Component component) {
         if (options.height.hasValue()) topBar.setHeight(options.height.get());
-        if (options.elevation.hasValue()) topBar.setElevation(options.elevation);
+        if (options.elevation.hasValue()) topBar.setElevation(options.elevation.get());
 
         if (options.title.height.hasValue()) topBar.setTitleHeight(options.title.height.get());
         if (options.title.text.hasValue()) topBar.setTitle(options.title.text.get());

lib/android/app/src/main/java/com/reactnativenavigation/views/topbar/TopBar.java

 import android.widget.TextView;
 
 import com.reactnativenavigation.BuildConfig;
+import com.reactnativenavigation.R;
 import com.reactnativenavigation.anim.TopBarAnimator;
 import com.reactnativenavigation.anim.TopBarCollapseBehavior;
 import com.reactnativenavigation.interfaces.ScrollEventListener;
 import com.reactnativenavigation.parse.Component;
 import com.reactnativenavigation.parse.params.Button;
 import com.reactnativenavigation.parse.params.Color;
-import com.reactnativenavigation.parse.params.Fraction;
 import com.reactnativenavigation.parse.params.Number;
 import com.reactnativenavigation.utils.CompatUtils;
 import com.reactnativenavigation.utils.ImageLoader;
 
     public TopBar(final Context context, ReactViewCreator buttonCreator, TitleBarReactViewCreator titleBarReactViewCreator, TopBarBackgroundViewController topBarBackgroundViewController, TopBarButtonController.OnClickListener onClickListener, StackLayout parentView, ImageLoader imageLoader) {
         super(context);
+        context.setTheme(R.style.TopBar);
         this.imageLoader = imageLoader;
         collapsingBehavior = new TopBarCollapseBehavior(this);
         this.topBarBackgroundViewController = topBarBackgroundViewController;
         titleBar.setRightButtons(rightButtons);
     }
 
-    public void setElevation(Fraction elevation) {
-        if (elevation.hasValue() &&
-            Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP &&
-            getElevation() != elevation.get().floatValue()) {
-            setElevation(UiUtils.dpToPx(getContext(), elevation.get().floatValue()));
+    public void setElevation(Double elevation) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP &&
+                getElevation() != elevation.floatValue()) {
+            setElevation(UiUtils.dpToPx(getContext(), elevation.floatValue()));
         }
     }
 

lib/android/app/src/main/res/values/styles.xml

         <item name="android:windowEnterAnimation">@null</item>
         <item name="android:windowExitAnimation">@null</item>
     </style>
+
+    <style name="TopBar" parent="ThemeOverlay.AppCompat.ActionBar">
+        <item name="elevation">0dp</item>
+    </style>
+
 </resources>