attach jni to ui thread, fix bucket bounding box

android/src/cpp/main.cpp

@@ -62,7 +62,7 @@ EGLContext g_context = EGL_NO_CONTEXT;
 std::recursive_mutex mutex;
 int mutex_count = 0;
 struct engine g_engine;
-JNIEnv* jni;
+thread_local JNIEnv* jni;
 
 jint JNI_OnLoad(JavaVM* vm, void* /*reserved*/)
 {
@@ -118,6 +118,16 @@ int GetUnicodeChar(struct android_app* app, int eventType, int keyCode, int meta
     return unicodeKey;
 }
 
+void android_attach_jni()
+{
+    g_engine.app->activity->vm->AttachCurrentThread(&jni, nullptr);
+}
+
+void android_detach_jni()
+{
+    g_engine.app->activity->vm->DetachCurrentThread();
+}
+
 void android_async_lock(struct engine* engine)
 {
     mutex.lock();