Resolve showOverlay promise after Overlay appeared

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

@@ -12,8 +12,8 @@ public class OverlayManager {
 
     public void show(ViewGroup root, ViewController overlay, CommandListener listener) {
         overlayRegistry.put(overlay.getId(), overlay);
+        overlay.setOnAppearedListener(() -> listener.onSuccess(overlay.getId()));
         root.addView(overlay.getView());
-        listener.onSuccess(overlay.getId());
     }
 
     public void dismiss(String componentId, CommandListener listener) {

lib/android/app/src/main/java/com/reactnativenavigation/viewcontrollers/ViewController.java

@@ -20,6 +20,8 @@ import com.reactnativenavigation.views.Component;
 
 public abstract class ViewController<T extends ViewGroup> implements ViewTreeObserver.OnGlobalLayoutListener {
 
+    private Runnable onAppearedListener;
+
     public interface ViewVisibilityListener {
         /**
          * @return true if the event is consumed, false otherwise
@@ -52,6 +54,10 @@ public abstract class ViewController<T extends ViewGroup> implements ViewTreeObs
         options = initialOptions.copy();
     }
 
+    public void setOnAppearedListener(Runnable onAppearedListener) {
+        this.onAppearedListener = onAppearedListener;
+    }
+
     protected abstract T createView();
 
     public void setViewVisibilityListener(ViewVisibilityListener viewVisibilityListener) {
@@ -162,6 +168,10 @@ public abstract class ViewController<T extends ViewGroup> implements ViewTreeObs
             parentController.clearOptions();
             if (getView() instanceof Component) parentController.applyChildOptions(options, (Component) getView());
         });
+        if (onAppearedListener != null) {
+            onAppearedListener.run();
+            onAppearedListener = null;
+        }
     }
 
     public void onViewWillDisappear() {