Using OpenCV with NDK in Android app development

Question

I am testing facedetection program at Android with NDK . I followed all discussions here . I copied all OpenCV's library files inside armeabi and armeabi-v7a into my project libs folder . Then my Android.mk is updated as

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

OPENCV_INSTALL_MODULES  :=  on
OPENCV_CAMERA_MODULES   :=  off
OPENCV_LIB_TYPE         :=  STATIC
include C:\adt-bundle-windows-x86\OpenCV-2.4.9-android-sdk\sdk\native\jni\OpenCV.mk

LOCAL_SRC_FILES  := DetectionBasedTracker_jni.cpp
LOCAL_C_INCLUDES += $(LOCAL_PATH)
LOCAL_LDLIBS     += -llog -ldl

LOCAL_MODULE     := detection_based_tracker

include $(BUILD_SHARED_LIBRARY)

Then I go to command window and type

C:\facedetection\jni\include>javah -classpath ../../bin/classes;C:
\adt-bundle-windows-x86\sdk\platforms\android-18\android.jar -o DetectionBas
edTracker_jni.h org.opencv.samples.facedetect.FdActivity
Error: Class org.opencv.android.CameraBridgeViewBase could not be found.

Then the error is Class org.opencv.android.CameraBridgeViewBase could not be found . What could be the reason for that error? Thanks

Answer 1

You are providing wrong \\ slash. You need to use this / slash instead.

Please change your below line

include C:\adt-bundle-windows-x86\OpenCV-2.4.9-android-sdk\sdk\native\jni\OpenCV.mk

to

include C:/adt-bundle-windows-x86/OpenCV-2.4.9-android-sdk/sdk/native/jni/OpenCV.mk