NDK-build不创建.so文件

Question

我正在尝试建立一个本地库，称为回执识别器，从Android应用程序调用该库。

我认为我正确设置了所有内容，因为NDK-build不会显示任何错误。 但是，当我调用System.loadLibrary("receiptrecognizer"); 我收到UnsatisfiedLinkError 。

原因是apk中没有libreceiptrecognizer.so文件。 实际上，当我运行ndk-build时，没有在任何地方创建libreceiptrecognizer.so文件。

为什么没有生成.so文件？

receiverecognizer使用openCV和tesseract（依次使用leptonica）。

这是我的Android.mk：

    LOCAL_PATH := $(call my-dir)

    include $(CLEAR_VARS)
    OPENCV_CAMERA_MODULES:=on
    OPENCV_INSTALL_MODULES:=on
    OPENCV_LIB_TYPE:=SHARED
    include ../opencv4android/sdk/native/jni/OpenCV.mk

    include $(CLEAR_VARS)
    LOCAL_MODULE := lept
    LOCAL_SRC_FILES := ../../tess-two/libs/$(TARGET_ARCH_ABI)/liblept.so
    include $(PREBUILT_SHARED_LIBRARY)

    include $(CLEAR_VARS)
    LOCAL_MODULE := tess
    LOCAL_SRC_FILES := ../../tess-two/libs/$(TARGET_ARCH_ABI)/libtess.so
    include $(PREBUILT_SHARED_LIBRARY)


    LOCAL_MODULE    := receiptrecognizer

    LOCAL_SRC_FILES := \
        src/OCRImagePreprocessor.cpp \
        src/util.cpp \
        ocrimagepreprocessorjni.cpp

    LOCAL_C_INCLUDES := \
      $(LOCAL_PATH)/../../opencv4android/sdk/native/jni/include \
      $(LOCAL_PATH)/../../tess-two/jni/com_googlecode_leptonica_android/src/src \
      $(LOCAL_PATH)/../../tess-two/jni/com_googlecode_tesseract_android/src \
      $(LOCAL_PATH)/../../tess-two/jni/com_googlecode_tesseract_android/src/ccutil \
      $(LOCAL_PATH)/../../tess-two/jni/com_googlecode_tesseract_android/src/ccstruct \
      $(LOCAL_PATH)/../../tess-two/jni/com_googlecode_tesseract_android/src/ccmain \
      $(LOCAL_PATH)/jni/src \
      $(LOCAL_PATH)/jni \
      $(LOCAL_PATH)/src \
      $(LOCAL_PATH)

    LOCAL_CFLAGS := \
      --std=c++11

    LOCAL_SHARED_LIBRARIES := \
        opencv_java3 \
        lept \
        tess

    include $(BUILD_SHARED_LIBRARY)

这是ndk-build的输出（关于覆盖目标命令的一些警告除外）：

[armeabi] Prebuilt       : liblept.so <= jni/../../tess-two/libs/armeabi/
[armeabi] Install        : liblept.so => libs/armeabi/liblept.so
[armeabi] Prebuilt       : libopencv_java3.so <= ../opencv4android/sdk/native/jni/../libs/armeabi/
[armeabi] Install        : libopencv_java3.so => libs/armeabi/libopencv_java3.so
[armeabi] Compile++ thumb: receiptrecognizer <= OCRImagePreprocessor.cpp
[armeabi] Compile++ thumb: receiptrecognizer <= util.cpp
[armeabi] Compile++ thumb: receiptrecognizer <= ocrimagepreprocessorjni.cpp
make.exe: Circular obj/local/armeabi/libtess.so <- obj/local/armeabi/libtess.so dependency dropped.
[armeabi] Prebuilt       : libtess.so <= obj/local/armeabi/objs/receiptrecognizer/src/
[armeabi] Install        : libtess.so => libs/armeabi/libtess.so
[armeabi-v7a] Prebuilt       : liblept.so <= jni/../../tess-two/libs/armeabi-v7a/
[armeabi-v7a] Install        : liblept.so => libs/armeabi-v7a/liblept.so
[armeabi-v7a] Prebuilt       : libopencv_java3.so <= ../opencv4android/sdk/native/jni/../libs/armeabi-v7a/
[armeabi-v7a] Install        : libopencv_java3.so => libs/armeabi-v7a/libopencv_java3.so
[armeabi-v7a] Compile++ thumb: receiptrecognizer <= OCRImagePreprocessor.cpp
[armeabi-v7a] Compile++ thumb: receiptrecognizer <= util.cpp
[armeabi-v7a] Compile++ thumb: receiptrecognizer <= ocrimagepreprocessorjni.cpp
make.exe: Circular obj/local/armeabi-v7a/libtess.so <- obj/local/armeabi-v7a/libtess.so dependency dropped.
[armeabi-v7a] Prebuilt       : libtess.so <= obj/local/armeabi-v7a/objs/receiptrecognizer/src/
[armeabi-v7a] Install        : libtess.so => libs/armeabi-v7a/libtess.so
[x86] Prebuilt       : liblept.so <= jni/../../tess-two/libs/x86/
[x86] Install        : liblept.so => libs/x86/liblept.so
[x86] Prebuilt       : libopencv_java3.so <= ../opencv4android/sdk/native/jni/../libs/x86/
[x86] Install        : libopencv_java3.so => libs/x86/libopencv_java3.so
[x86] Compile++      : receiptrecognizer <= OCRImagePreprocessor.cpp
[x86] Compile++      : receiptrecognizer <= util.cpp
[x86] Compile++      : receiptrecognizer <= ocrimagepreprocessorjni.cpp
make.exe: Circular obj/local/x86/libtess.so <- obj/local/x86/libtess.so dependency dropped.
[x86] Prebuilt       : libtess.so <= obj/local/x86/objs/receiptrecognizer/src/
[x86] Install        : libtess.so => libs/x86/libtess.so
[mips] Prebuilt       : liblept.so <= jni/../../tess-two/libs/mips/
[mips] Install        : liblept.so => libs/mips/liblept.so
[mips] Prebuilt       : libopencv_java3.so <= ../opencv4android/sdk/native/jni/../libs/mips/
[mips] Install        : libopencv_java3.so => libs/mips/libopencv_java3.so
[mips] Compile++      : receiptrecognizer <= OCRImagePreprocessor.cpp
[mips] Compile++      : receiptrecognizer <= util.cpp
[mips] Compile++      : receiptrecognizer <= ocrimagepreprocessorjni.cpp
make.exe: Circular obj/local/mips/libtess.so <- obj/local/mips/libtess.so dependency dropped.
[mips] Prebuilt       : libtess.so <= obj/local/mips/objs/receiptrecognizer/src/
[mips] Install        : libtess.so => libs/mips/libtess.so

任何想法表示赞赏。

Answer 1

在显示的ndk-build跟踪中，我看到以下行make.exe: Circular obj/local/mips/libtess.so <- obj/local/mips/libtess.so dependency dropped.

我认为这就是为什么您没有生成正确的.so lib的原因。 我认为您忘记在LOCAL_MODULE := receiptrecognizer之前添加一个include $(CLEAR_VARS) 。

希望对您有用。