CODEWITHSUNDEEP
androidc++android-ndk
VTR2015
VTR2015

Reputation: 439

How to generate .a to .so

I own a number of .a files and would like to generate .so using ndk-build.

Android.mk

LOCAL_PATH  := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE := nonfree
LOCAL_MODULE += opencv_java3

LOCAL_SRC_FILES :=              \
    libopencv_aruco.a           \
    libopencv_bgsegm.a                  \
    libopencv_bioinspired.a     \
    libopencv_calib3d.a     \
    libopencv_ccalib.a     \
    libopencv_core.a     \
    libopencv_datasets.a     \
    libopencv_dnn.a     \
    libopencv_dpm.a     \
    libopencv_face.a     \
    libopencv_features2d.a     \
    libopencv_flann.a     \
    libopencv_fuzzy.a     \
    libopencv_highgui.a    \
    libopencv_imgcodecs.a    \
    libopencv_imgproc.a    \
    libopencv_line_descriptor.a    \
    libopencv_ml.a    \
    libopencv_objdetect.a    \
    libopencv_optflow.a    \
    libopencv_photo.a    \
    libopencv_plot.a    \
    libopencv_reg.a    \
    libopencv_rgbd.a    \
    libopencv_saliency.a    \
    libopencv_shape.a    \
    libopencv_stereo.a    \
    libopencv_stitching.a    \
    libopencv_structured_light.a    \
    libopencv_superres.a    \
    libopencv_surface_matching.a    \
    libopencv_text.a    \
    libopencv_tracking.a    \
    libopencv_ts.a    \
    libopencv_video.a    \
    libopencv_videoio.a    \
    libopencv_videostab.a   \
    libopencv_xfeatures2d.a   \
    libopencv_ximgproc.a   \
    libopencv_xobjdetect.a   \
    libopencv_xphoto.a

LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include

include $(PREBUILT_STATIC_LIBRARY)

To use the NDK-build used these steps.

When trying to generate .so this returning me this error:

C:\Android\sdk\ndk-bundle\build\ndk-build.cmd clean Android NDK: LOCAL_MODULE definition in jni/Android.mk must not contain space
C:/Android/sdk/ndk-bundle/build//../build/core/build-shared-library.mk:23: *** Android NDK: Please correct error. Aborting . Stop.

Process finished with exit code 2

Upvotes: 1

Views: 696

Answers (1)

jesosk
jesosk

Reputation: 313

LOCAL_MODULE specifies the name of the final .so file built. ndk-build is giving an error since a space is introduced in the name when you concatenate the two strings nonfree and opencv_java3:

LOCAL_MODULE := nonfree
LOCAL_MODULE += opencv_java3

If you would like a concatenated name I would suggest doing this manually:

LOCAL_MODULE := nonfree_opencv_java3

You will then need to specify this name when you load the .so file through JNI.

Upvotes: 1

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