diff --git a/engine/src/flutter/shell/platform/android/io/flutter/embedding/android/FlutterFragmentActivity.java b/engine/src/flutter/shell/platform/android/io/flutter/embedding/android/FlutterFragmentActivity.java
index e699c2abee..d7c8515b48 100644
--- a/engine/src/flutter/shell/platform/android/io/flutter/embedding/android/FlutterFragmentActivity.java
+++ b/engine/src/flutter/shell/platform/android/io/flutter/embedding/android/FlutterFragmentActivity.java
@@ -46,6 +46,7 @@ import io.flutter.embedding.engine.FlutterEngine;
 import io.flutter.embedding.engine.FlutterShellArgs;
 import io.flutter.embedding.engine.plugins.util.GeneratedPluginRegister;
 import io.flutter.plugin.platform.PlatformPlugin;
+import io.flutter.util.ViewUtils;
 
 /**
  * A Flutter {@code Activity} that is based upon {@link FragmentActivity}.
@@ -65,7 +66,8 @@ public class FlutterFragmentActivity extends FragmentActivity
   // FlutterFragment management.
   private static final String TAG_FLUTTER_FRAGMENT = "flutter_fragment";
   // TODO(mattcarroll): replace ID with R.id when build system supports R.java
-  private static final int FRAGMENT_CONTAINER_ID = 609893468; // random number
+  public static final int FRAGMENT_CONTAINER_ID =
+      ViewUtils.generateViewId(609893468); // random number
 
   /**
    * Creates an {@link Intent} that launches a {@code FlutterFragmentActivity}, which executes a
diff --git a/engine/src/flutter/shell/platform/android/test/io/flutter/embedding/android/FlutterFragmentActivityTest.java b/engine/src/flutter/shell/platform/android/test/io/flutter/embedding/android/FlutterFragmentActivityTest.java
index 70e32c4c32..e49cd42906 100644
--- a/engine/src/flutter/shell/platform/android/test/io/flutter/embedding/android/FlutterFragmentActivityTest.java
+++ b/engine/src/flutter/shell/platform/android/test/io/flutter/embedding/android/FlutterFragmentActivityTest.java
@@ -17,6 +17,7 @@ import android.content.Intent;
 import android.content.pm.ActivityInfo;
 import android.content.pm.PackageManager;
 import android.os.Bundle;
+import android.view.View;
 import android.view.ViewGroup;
 import android.widget.FrameLayout;
 import androidx.annotation.NonNull;
@@ -104,6 +105,15 @@ public class FlutterFragmentActivityTest {
         activity.createFlutterFragment().getDartEntrypointLibraryUri(), "package:foo/bar.dart");
   }
 
+  @Test
+  public void hasRootLayoutId() {
+    FlutterFragmentActivityWithRootLayout activity =
+        Robolectric.buildActivity(FlutterFragmentActivityWithRootLayout.class).get();
+    activity.onCreate(null);
+    assertNotNull(activity.FRAGMENT_CONTAINER_ID);
+    assertTrue(activity.FRAGMENT_CONTAINER_ID != View.NO_ID);
+  }
+
   @Test
   public void itRegistersPluginsAtConfigurationTime() {
     try (ActivityScenario<FlutterFragmentActivity> scenario =