Android ndk编译错误：未知类型名称'JNIEnv'

Question

我在Android工作室编码，会制作一个.so文件。但我无法解决这个问题。虽然我已经包括谁可以帮助我？

我的jni文件夹和错误信息img ：

http://i.stack.imgur.com/Ankmm.png

我的Android.mk文件：

include $(CLEAR_VARS) 
LOCAL_MODULE := swresample-prebuilt 
LOCAL_SRC_FILES := $(LOCAL_PATH)/../../libs/libswresample-2.so 
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/libswresample include 
$(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := ffmpegplay
LOCAL_SRC_FILES := NativeUtil.c FFmpegCodec.c
LOCAL_LDLIBS :=-llog
LOCAL_SHARED_LIBRARIES := avcodec-prebuilt avformat-prebuilt swscale-prebuilt avutil-prebuilt  swresample-prebuilt
LOCAL_CFLAGS := -D__STDC_CONSTANT_MACROS
include $(BUILD_SHARED_LIBRARY)