update build

com.unity.uiwidgets/Runtime/engine2/UIWidgetsPanel.cs

         static bool _ShowDebugLog = false;
 
 #if !UNITY_EDITOR && UNITY_ANDROID
-        static bool InitAnroidGLFlag = true;
+        bool InitAnroidGLFlag = true;
 
         IEnumerator InitAnroidGL() {
             yield return new WaitForEndOfFrame();
         protected void OnEnable() {
 #if !UNITY_EDITOR && UNITY_ANDROID
             if (InitAnroidGLFlag) {
+                enabled = false;
-                enabled = false;
                 return;
             }
 #endif

engine/Build.bee.cs

                 // icudtl
                 new StaticLibrary("icudtl.o"),
 
-                // libcxx
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxx/src/libcxx.algorithm.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxx/src/libcxx.any.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxx/src/libcxx.bind.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxx/src/libcxx.charconv.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxx/src/libcxx.chrono.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxx/src/libcxx.condition_variable.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxx/src/libcxx.condition_variable_destructor.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxx/src/libcxx.debug.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxx/src/libcxx.exception.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxx/src/libcxx.functional.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxx/src/libcxx.future.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxx/src/libcxx.hash.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxx/src/libcxx.ios.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxx/src/libcxx.iostream.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxx/src/libcxx.locale.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxx/src/libcxx.memory.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxx/src/libcxx.mutex.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxx/src/libcxx.mutex_destructor.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxx/src/libcxx.new.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxx/src/libcxx.optional.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxx/src/libcxx.random.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxx/src/libcxx.regex.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxx/src/libcxx.shared_mutex.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxx/src/libcxx.stdexcept.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxx/src/libcxx.string.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxx/src/libcxx.strstream.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxx/src/libcxx.system_error.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxx/src/libcxx.thread.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxx/src/libcxx.typeinfo.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxx/src/libcxx.utility.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxx/src/libcxx.valarray.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxx/src/libcxx.variant.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxx/src/libcxx.vector.o"),
-                // libcxxabi
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxxabi/src/libcxxabi.abort_message.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxxabi/src/libcxxabi.cxa_aux_runtime.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxxabi/src/libcxxabi.cxa_default_handlers.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxxabi/src/libcxxabi.cxa_demangle.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxxabi/src/libcxxabi.cxa_exception_storage.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxxabi/src/libcxxabi.cxa_guard.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxxabi/src/libcxxabi.cxa_handlers.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxxabi/src/libcxxabi.cxa_noexception.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxxabi/src/libcxxabi.cxa_unexpected.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxxabi/src/libcxxabi.cxa_vector.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxxabi/src/libcxxabi.cxa_virtual.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxxabi/src/libcxxabi.fallback_malloc.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxxabi/src/libcxxabi.private_typeinfo.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxxabi/src/libcxxabi.stdlib_exception.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxxabi/src/libcxxabi.stdlib_stdexcept.o"),
-                new StaticLibrary(flutterRoot+"/out/android_debug_unopt/obj/third_party/libcxxabi/src/libcxxabi.stdlib_typeinfo.o"),
-
                 new StaticLibrary(flutterRoot+"/third_party/android_tools/ndk/platforms/android-16/arch-arm/usr/lib/crtbegin_so.o"),
                 new StaticLibrary(flutterRoot+"/third_party/android_tools/ndk/platforms/android-16/arch-arm/usr/lib/crtend_so.o"),
 

engine/README.md

      "//third_party/icu",
      "//third_party/skia",
 +    "//third_party/skia/modules/skottie",
++    "//third_party/libcxx",
++    "//third_party/libcxxabi",
    ]
  
    deps = [
 +  ]
 +}
 ```
+remove `visibility = [ "../libcxx:*" ]` from `/build/secondary/third_party/libcxxabi/BUILD.gn`
+
 cmd
 ```
 cd $FLUTTER_ROOT

engine/src/shell/platform/unity/android/unity_surface_manager.cc

 
   void UnitySurfaceManager::GetUnityContext()
   {
+    if(egl_unity_context_ != nullptr){
+      return;
+    }
     egl_display_ = eglGetCurrentDisplay();
     egl_unity_context_ = eglGetCurrentContext();
     FML_CHECK(egl_display_ != EGL_NO_DISPLAY)