Question

我正在尝试减少android应用程序的.so文件大小，但是当我重新编译动态库时，此代码导致我的应用程序崩溃

java.lang.UnsatisfiedLinkError: No implementation found for long org.opencv.core.Mat.n_Mat() (tried Java_org_opencv_core_Mat_n_1Mat and Java_org_opencv_core_Mat_n_1Mat__).

我也尝试从src重新编译，但是由于某些原因，当我添加修改CMakeLists.txt根文件（此时为第153行）时，编译失败，因为没有从样本中找到文件。 / p>

这是我的命令，用于从arm64静态库中重新编译.so

$ANDROID_NDK_ROOT/toolchains/llvm/prebuilt/darwin-x86_64/bin/clang++  -fpic --sysroot=$ANDROID_NDK_ROOT/toolchains/llvm/prebuilt/darwin-x86_64/sysroot -target aarch64-linux-android21 -shared -Xlinker -soname=libopencv_java4.so -o libopencv_java4.so -Xlinker --no-as-needed -Xlinker --whole-archive -Xlinker libcpufeatures.a -Xlinker libIlmImf.a -Xlinker liblibjasper.a -Xlinker liblibjpeg-turbo.a -Xlinker liblibpng.a -Xlinker liblibprotobuf.a -Xlinker liblibtiff.a -Xlinker liblibwebp.a -Xlinker libquirc.a -Xlinker libtbb.a -Xlinker libtegra_hal.a -Xlinker libopencv_imgcodecs.a -Xlinker libopencv_imgproc.a -Xlinker libopencv_core.a -Xlinker --no-whole-archive -nostdlib++ -llog -ljnigraphics -landroid -lmediandk -lz

生成的.so信息

Dynamic section at offset 0x9fabc8 contains 33 entries:
  Tag        Type                         Name/Value
 0x0000000000000001 (NEEDED)             Shared library: [liblog.so]
 0x0000000000000001 (NEEDED)             Shared library: [libjnigraphics.so]
 0x0000000000000001 (NEEDED)             Shared library: [libandroid.so]
 0x0000000000000001 (NEEDED)             Shared library: [libmediandk.so]
 0x0000000000000001 (NEEDED)             Shared library: [libz.so]
 0x0000000000000001 (NEEDED)             Shared library: [libm.so]
 0x0000000000000001 (NEEDED)             Shared library: [libdl.so]
 0x0000000000000001 (NEEDED)             Shared library: [libc.so]
 0x000000000000000e (SONAME)             Library soname: [libopencv_java4.so]
 0x0000000000000019 (INIT_ARRAY)         0x9e4948
 0x000000000000001b (INIT_ARRAYSZ)       216 (bytes)
 0x000000000000001a (FINI_ARRAY)         0x9e4a20
 0x000000000000001c (FINI_ARRAYSZ)       16 (bytes)
 0x0000000000000004 (HASH)               0x1c8
 0x000000006ffffef5 (GNU_HASH)           0x5378
 0x0000000000000005 (STRTAB)             0x1d230
 0x0000000000000006 (SYMTAB)             0xa8d0
 0x000000000000000a (STRSZ)              121597 (bytes)
 0x000000000000000b (SYMENT)             24 (bytes)
 0x0000000000000003 (PLTGOT)             0xa0ae18
 0x0000000000000002 (PLTRELSZ)           27888 (bytes)
 0x0000000000000014 (PLTREL)             RELA
 0x0000000000000017 (JMPREL)             0xb0260
 0x0000000000000007 (RELA)               0x3c658
 0x0000000000000008 (RELASZ)             474120 (bytes)
 0x0000000000000009 (RELAENT)            24 (bytes)
 0x000000000000001e (FLAGS)              BIND_NOW
 0x000000006ffffffb (FLAGS_1)            Flags: NOW
 0x000000006ffffffe (VERNEED)            0x3c5f8
 0x000000006fffffff (VERNEEDNUM)         3
 0x000000006ffffff0 (VERSYM)             0x3ad2e
 0x000000006ffffff9 (RELACOUNT)          16950
 0x0000000000000000 (NULL)               0x0

原始.so信息

Dynamic section at offset 0x116d898 contains 32 entries:
  Tag        Type                         Name/Value
 0x0000000000000001 (NEEDED)             Shared library: [libdl.so]
 0x0000000000000001 (NEEDED)             Shared library: [libm.so]
 0x0000000000000001 (NEEDED)             Shared library: [liblog.so]
 0x0000000000000001 (NEEDED)             Shared library: [libjnigraphics.so]
 0x0000000000000001 (NEEDED)             Shared library: [libz.so]
 0x0000000000000001 (NEEDED)             Shared library: [libc.so]
 0x0000000000000001 (NEEDED)             Shared library: [libandroid.so]
 0x0000000000000001 (NEEDED)             Shared library: [libmediandk.so]
 0x000000000000000e (SONAME)             Library soname: [libopencv_java4.so]
 0x0000000000000019 (INIT_ARRAY)         0x11378f0
 0x000000000000001b (INIT_ARRAYSZ)       384 (bytes)
 0x000000000000001a (FINI_ARRAY)         0x1137a70
 0x000000000000001c (FINI_ARRAYSZ)       16 (bytes)
 0x0000000000000004 (HASH)               0x228
 0x0000000000000005 (STRTAB)             0x3b328
 0x0000000000000006 (SYMTAB)             0xc018
 0x000000000000000a (STRSZ)              372415 (bytes)
 0x000000000000000b (SYMENT)             24 (bytes)
 0x0000000000000003 (PLTGOT)             0x117dad8
 0x0000000000000002 (PLTRELSZ)           49488 (bytes)
 0x0000000000000014 (PLTREL)             RELA
 0x0000000000000017 (JMPREL)             0x161668
 0x0000000000000007 (RELA)               0x9a138
 0x0000000000000008 (RELASZ)             816432 (bytes)
 0x0000000000000009 (RELAENT)            24 (bytes)
 0x000000000000001e (FLAGS)              BIND_NOW
 0x000000006ffffffb (FLAGS_1)            Flags: NOW
 0x000000006ffffffe (VERNEED)            0x9a0d8
 0x000000006fffffff (VERNEEDNUM)         3
 0x000000006ffffff0 (VERSYM)             0x961e8
 0x000000006ffffff9 (RELACOUNT)          26157
 0x0000000000000000 (NULL)               0x0

Answer 1

好吧，最后我通过build_sdk.py脚本减小了opencv的大小，只是将BUILD_LIST =“ core，imgproc，imgcodecs，java”添加到了build_library函数的cmake_vars字典中，并且我也将INSTALL_ANDROID_EXAMPLES禁用为“ OFF” ”，并通过--no_samples_build标志作为命令行选项

减少opencv4动态库.so大小

1 个答案: