find title TextView by text

android/app/src/main/java/com/reactnativenavigation/utils/ViewUtils.java

@@ -84,10 +84,18 @@ public class ViewUtils {
         }
     }
 
+    public interface Matcher<T> {
+        boolean match(T child);
+    }
+
     /**
      * Returns the first instance of clazz in root
      */
     @Nullable public static <T> T findChildByClass(ViewGroup root, Class clazz) {
+        return findChildByClass(root, clazz, null);
+    }
+
+    @Nullable public static <T> T findChildByClass(ViewGroup root, Class clazz, Matcher<T> matcher) {
         for (int i = 0; i < root.getChildCount(); i++) {
             View view = root.getChildAt(i);
             if (clazz.isAssignableFrom(view.getClass())) {
@@ -95,9 +103,14 @@ public class ViewUtils {
             }
 
             if (view instanceof ViewGroup) {
-                view = findChildByClass((ViewGroup) view, clazz);
+                view = (View) findChildByClass((ViewGroup) view, clazz, matcher);
                 if (view != null && clazz.isAssignableFrom(view.getClass())) {
-                    return (T) view;
+                    if (matcher == null) {
+                        return (T) view;
+                    }
+                    if (matcher.match((T) view)) {
+                        return (T) view;
+                    }
                 }
             }
         }

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

@@ -186,12 +186,21 @@ public class TitleBar extends Toolbar {
     }
 
     private void animateTitle(int alpha) {
-        getTitleView().animate()
-                .alpha(alpha)
-                .setDuration(TITLE_VISIBILITY_ANIMATION_DURATION);
+        View titleView = getTitleView();
+        if (titleView != null) {
+            titleView.animate()
+                    .alpha(alpha)
+                    .setDuration(TITLE_VISIBILITY_ANIMATION_DURATION);
+        }
     }
 
-    private View getTitleView() {
-        return getChildAt(0) instanceof TextView ? getChildAt(0) : getChildAt(1);
+    @Nullable
+    protected View getTitleView() {
+        return ViewUtils.findChildByClass(this, TextView.class, new ViewUtils.Matcher<TextView>() {
+            @Override
+            public boolean match(TextView child) {
+                return child.getText().equals(getTitle());
+            }
+        });
     }
 }

android/app/src/main/java/com/reactnativenavigation/views/collapsingToolbar/CollapsingTitleBar.java

@@ -30,7 +30,10 @@ public class CollapsingTitleBar extends TitleBar implements View.OnTouchListener
             ViewUtils.runOnPreDraw(this, new Runnable() {
                 @Override
                 public void run() {
-                    hideTitle();
+                    View titleView = getTitleView();
+                    if (titleView != null) {
+                        titleView.setAlpha(0);
+                    }
                 }
             });
         }