what's happened? java.lang.UnsatisfiedLinkError: dlopen failed: cannot locate symbol

[lark...@gmail.com]

java.lang.UnsatisfiedLinkError: dlopen failed: cannot locate symbol "hb_ft_face_create" referenced by "libHelloWorld.so"...

hb_ft_face_create() is in hb_ft.h，i build harfbuzz_ng.so share library， my helloword application it word well in android 4.0，but i

install it in Android 4.4 and Android 5.0，it error：

java.lang.UnsatisfiedLinkError: dlopen failed: cannot locate symbol "hb_ft_face_create" referenced by "libHelloWorld.so"...

jni：

HelloWorld.java->HelloWorld.c(libHelloWorld.so)，HelloWorld.c use hb_ft_face_create()。

ndk10 and Android.mk:

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE := harfbuzz_ng

LOCAL_SRC_FILES := $(LOCAL_PATH)/../../library/libs/libharfbuzz_ng.so

include $(PREBUILT_SHARED_LIBRARY)

.....

include $(CLEAR_VARS)

LOCAL_SHARED_LIBRARIES := harfbuzz_ng

.....