从3.6更新到Android Studio 4.0后，使用NDK支持构建项目时出错 [英] Error when building project with NDK support after updating to Android Studio 4.0 from 3.6

问题描述

将Android Studio更新为4.0项目后，构建完成并出现错误

After updating Android Studio to 4.0 project build finishes with error

使用操作系统独立的路径'lib/armeabi-v7a/libdlib.so'找到了多个文件.如果您正在使用jniLib和CMake导入目标，请参见 https://developer.android.com/studio/preview/features#automatic_packaging_of_prebuilt_dependencies_used_by_cmake

该链接指向带有 Android Studio Preview中的新功能(为4.1

The link leads to the page with New features in Android Studio Preview which is 4.1

编辑实际上，您可以找到Google缓存中链接的信息:

EDIT Actually you can find information that is linked in Google cache: Automatic packaging of prebuilt dependencies used by CMake What is stated there is:

Android Gradle插件的早期版本要求您使用jniLibs显式打包CMake外部本机内部版本使用的所有预构建库.使用Android Gradle Plugin 4.0时，不再需要上述配置，并且会导致构建失败:

Prior versions of the Android Gradle Plugin required that you explicitly package any prebuilt libraries used by your CMake external native build by using jniLibs. With Android Gradle Plugin 4.0, the above configuration is no longer necessary and will result in a build failure:

但对我而言并非如此

这是 build.gradle

apply plugin: 'com.android.library'
apply plugin: 'kotlin-android'
android {
compileSdkVersion 29
buildToolsVersion "29.0.2"


defaultConfig {
    minSdkVersion 21
    targetSdkVersion 29
    versionCode 1
    versionName "1.0"

    externalNativeBuild {
        cmake {
            cFlags "-O3"
            cppFlags "-std=c++11 -frtti -fexceptions -mfpu=neon"
            arguments "-DANDROID_PLATFORM=android-16",
                    "-DANDROID_TOOLCHAIN=clang",
                    "-DANDROID_STL=c++_shared",
                    "-DANDROID_ARM_NEON=TRUE",
                    "-DANDROID_CPP_FEATURES=rtti exceptions"
        }
    }
}

buildTypes {
    debug {}
    stage {
        debuggable true
        minifyEnabled false
    }

    release {
        minifyEnabled false
    }
}

kotlinOptions {
    jvmTarget = "1.8"
}

externalNativeBuild {
    cmake {
        path "src/main/cpp/CMakeLists.txt"
        version "3.10.2"
    }
}

packagingOptions {
    pickFirst "**/libc++_shared.so"
    pickFirst "**/libdlib.so"
}

}

dependencies {
   implementation fileTree(dir: 'libs', include: ['*.jar'])

   implementation 'androidx.annotation:annotation:1.1.0'
   implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
}

和 CMakeLists.txt

set(LIB_DIR ${CMAKE_SOURCE_DIR}/src/main/jniLibs)

#
cmake_minimum_required(VERSION 3.4.1)

add_library(dlib SHARED IMPORTED)

# sets the location of the prebuilt dlib .so
set_target_properties( dlib
        PROPERTIES IMPORTED_LOCATION
        ${CMAKE_SOURCE_DIR}/../jniLibs/${ANDROID_ABI}/libdlib.so )

# ------------------------------------------------------------------

add_library( # Sets the name of the library.
        face-lib

        # Sets the library as a shared library.
        SHARED

        # Provides a relative path to your source file(s).
        face-lib.cpp)

target_include_directories(
        face-lib PRIVATE
        ${CMAKE_SOURCE_DIR}/include
)

find_library( # Sets the name of the path variable.
        log-lib

        # Specifies the name of the NDK library that
        # you want CMake to locate.
        log)


target_link_libraries( # Specifies the target library.
        face-lib

        dlib

        # Links the target library to the log library
        # included in the NDK.
        ${log-lib})

推荐答案

好，所以我找到了解决方案，我将其与本机库一起添加到了模块中:

Ok, So I have found the solution, I have added this to the module with my native libraries:

 packagingOptions {
        pickFirst "**/libdlib.so"
    }

我不喜欢它，因为它可以解决后果，而不是根本原因.如果有人有更好的解决方案，请在此处发布.

I don't like it as it, as it fixes the consequences, not the root cause. If somebody has a better solution please post it here.

另一个可行的解决方案在@GavinAndre answer 中指出要点是，如果您使用的是Cmake，请不要将 .so 存储在 jniLibs 文件夹中.

Another solution that worked is pointed in @GavinAndre answer The main point is that if you are using Cmake, then don't store your .so in jniLibs folder.

将它们移动到另一个文件夹，例如 cmakeLibs .
例如:

Move them to another folder for example cmakeLibs.
For example:

set_target_properties( dlib
        PROPERTIES IMPORTED_LOCATION
        ${CMAKE_SOURCE_DIR}/../cmakeLibs/${ANDROID_ABI}/libdlib.so )

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