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  2. Hi and thanks for practically the only guide online for how to do this!!
  4. I am having trouble with what I believe is a linker error. Though ndk-builder gives no errors for building libnonfree.so, I noticed with ls-la that the size of my file is much smaller than the one you provided pre-compiled (5088 bytes vs 460144 bytes for yours).
  6. libnonfree.so ndk-build output:
  7. nathan@nathan-lenovo:~/Downloads/nonfree_opencv_android/jni$ ../../android-ndk-r10c/ndk-build
  8. [armeabi] Prebuilt : libopencv_java.so <= /home/nathan/Downloads/OpenCV-2.4.9-android-sdk/sdk/native/jni/../libs/armeabi/
  9. [armeabi] SharedLibrary : libnonfree.so
  10. [armeabi] Install : libnonfree.so => libs/armeabi/libnonfree.so
  17. Application.mk:
  18. APP_ABI := armeabi
  19. #APP_ABI += armeabi-v7a # you can do either armeabi or armeabi-v7a, steps are the same.
  20. #APP_ABI += x86
  21. APP_STL := gnustl_static
  22. APP_CPPFLAGS := -frtti -fexceptions
  23. APP_PLATFORM := android-19
  30. Android.mk:
  31. LOCAL_PATH:= $(call my-dir)
  32. include $(CLEAR_VARS)
  33. OPENCV_INSTALL_MODULES:=on
  34. OPENCV_CAMERA_MODULES:=off
  35. include /home/nathan/Downloads/OpenCV-2.4.9-android-sdk/sdk/native/jni/OpenCV.mk
  37. LOCAL_C_INCLUDES:= /home/nathan/Downloads/OpenCV-2.4.9-android-sdk/sdk/native/jni/include
  38. LOCAL_MODULE := nonfree
  39. LOCAL_CFLAGS := -Werror -O3 -ffast-math
  40. LOCAL_LDLIBS += -llog
  42. # for 2.4.8, delete the line precomp.cpp \
  43. LOCAL_SRC_FILES := nonfree_init.cpp \
  44. precomp.cpp \
  45. sift.cpp \
  46. surf.cpp
  47. include $(BUILD_SHARED_LIBRARY)
  55. This is the output for the demo C++ app:
  56. nathan@nathan-lenovo:~/Downloads/sift_demo/sift_opencv_android$ ../../android-ndk-r10c/ndk-build
  57. [armeabi] Prebuilt : libopencv_java.so <= jni/
  58. [armeabi] Install : libopencv_java.so => libs/armeabi/libopencv_java.so
  59. [armeabi] Prebuilt : libnonfree.so <= jni/
  60. [armeabi] Install : libnonfree.so => libs/armeabi/libnonfree.so
  61. [armeabi] Compile++ thumb: test_sift <= test_sift.cpp
  62. [armeabi] Executable : test_sift
  63. /home/nathan/Downloads/android-ndk-r10c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ./obj/local/armeabi/objs/test_sift/test_sift.o: in function .LTHUNK7:/home/nathan/Downloads/OpenCV-2.4.9-android-sdk/sdk/native/jni/include/opencv2/nonfree/features2d.hpp:58: error: undefined reference to 'vtable for cv::SIFT'
  64. /home/nathan/Downloads/android-ndk-r10c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ./obj/local/armeabi/objs/test_sift/test_sift.o: in function .LTHUNK7:/home/nathan/Downloads/OpenCV-2.4.9-android-sdk/sdk/native/jni/include/opencv2/nonfree/features2d.hpp:58: error: undefined reference to 'VTT for cv::SIFT'
  65. /home/nathan/Downloads/android-ndk-r10c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ./obj/local/armeabi/objs/test_sift/test_sift.o: in function main:jni/test_sift.cpp:39: error: undefined reference to 'cv::SIFT::SIFT(int, int, double, double, double)'
  66. /home/nathan/Downloads/android-ndk-r10c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ./obj/local/armeabi/objs/test_sift/test_sift.o: in function main:jni/test_sift.cpp:47: error: undefined reference to 'cv::SIFT::SIFT(int, int, double, double, double)'
  67. collect2: ld returned 1 exit status
  68. make: *** [obj/local/armeabi/test_sift] Error 1
  74. Application.mk:
  75. APP_ABI := armeabi
  76. #APP_ABI += armeabi-v7a
  77. APP_STL := gnustl_static
  78. APP_CPPFLAGS := -frtti -fexceptions
  79. APP_PLATFORM := android-19
  84. Android.mk:
  85. LOCAL_PATH:= $(call my-dir)
  87. include $(CLEAR_VARS)
  88. LOCAL_MODULE := sift_prebuilt
  89. LOCAL_SRC_FILES := libnonfree.so
  90. include $(PREBUILT_SHARED_LIBRARY)
  92. include $(CLEAR_VARS)
  93. LOCAL_MODULE := opencv_java_prebuilt
  94. LOCAL_SRC_FILES := libopencv_java.so
  95. include $(PREBUILT_SHARED_LIBRARY)
  97. include $(CLEAR_VARS)
  98. LOCAL_C_INCLUDES:= /home/nathan/Downloads/OpenCV-2.4.9-android-sdk/sdk/native/jni/include/
  99. LOCAL_MODULE := test_sift
  100. LOCAL_CFLAGS := -Werror -O3 -ffast-math
  101. LOCAL_LDLIBS += -llog -ldl
  102. LOCAL_SHARED_LIBRARIES := sift_prebuilt opencv_java_prebuilt
  103. LOCAL_SRC_FILES := test_sift.cpp
  104. include $(BUILD_EXECUTABLE)
  105.  
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