链接外部共享库android ndk [英] Link external shared library android ndk

问题描述

我已经使用android-ndk工具链(预先构建的llvm)构建了python3，并且尝试在android studio中链接到我的项目.构建完成没有错误，但是当我启动应用程序时出现此错误:

I have built python3 with the android-ndk toolchain (llvm prebuilt) and I'm trying to link against my project in android studio. The build finishes without error but when I launch the app I get this error:

28926-28926/com.e.python3 E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.e.python3, PID: 28926
    java.lang.UnsatisfiedLinkError: dlopen failed: library "/home/user/AndroidStudioProjects/Python3/app/src/main/cpp/../jniLibs/x86/libpython3.8.so" not found
        at java.lang.Runtime.loadLibrary0(Runtime.java:1016)
        at java.lang.System.loadLibrary(System.java:1657)
        at com.e.python3.MainActivity.<clinit>(MainActivity.java:12)
...

我在该主题上发现的其他线程与将lib导出到apk有关，但就我而言，apk在lib目录中具有lib(我可以通过adb或使用apk分析器查看它).

The other threads I have found on the subject are related to exporting the lib to the apk but in my case the apk has the lib in the lib directory(I can see it through adb or with the apk analyser).

我遵循了以下指南: https://developer.android.com/studio/projects/configure-cmake

这是我的CMakeLists.txt:

Here is my CMakeLists.txt:

cmake_minimum_required(VERSION 3.4.1)

add_library( # Sets the name of the library.
        native-lib
        SHARED
        native-lib.cpp)

find_library(
        log-lib
        log)

include_directories(
        /home/user/PythonBuild/python390.${CMAKE_ANDROID_ARCH_ABI}/include/python3.8
)

add_library(python3 SHARED IMPORTED)
set_target_properties(python3 PROPERTIES IMPORTED_LOCATION ${CMAKE_CURRENT_SOURCE_DIR}/../jniLibs/${CMAKE_ANDROID_ARCH_ABI}/libpython3.8.so)

target_link_libraries(
        native-lib
        python3
        ${log-lib})

我的礼物:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "com.e.python3"
        minSdkVersion 23
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        externalNativeBuild {
            cmake {
                cppFlags ""
            }
        }
        ndk {
            moduleName "jnilib"
        }
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    externalNativeBuild {
        cmake {
            path "src/main/cpp/CMakeLists.txt"
            version "3.10.2"
        }
    }
    splits {
        abi {
            enable true
            reset()
            include 'x86_64', 'armeabi-v7a', 'arm64-v8a', 'x86'
            universalApk false
        }
    }

    sourceSets {
        main {
            jniLibs.srcDirs = ['src/main/jniLibs']
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}

奇怪的是，它尝试使用其所构建的计算机(而不是apk之一)的路径打开共享库.

What's weird is that it tries to open the shared lib with the path from the computer it was built on, not the one of the apk.

推荐答案

我在那里找到了答案:在Android Studio(cmake)中使用预构建的共享库感谢@Michael

I found the answer there: Using a prebuilt shared Library in Android Studio (cmake) thanks to @Michael

我在编译python时更改了INSTSONAME，以放弃该库的版本化部分(libpython3.8.so.1.0-> libpython3.8.so).这样做也会丢弃SONAME.使用patchelf，我可以添加SONAME并找到该库.

I changed the INSTSONAME while compiling python to discard the versioned part of the library (libpython3.8.so.1.0 -> libpython3.8.so). Doing so also discarded the SONAME. Using patchelf I was able to add SONAME and the library is found.

这篇关于链接外部共享库android ndk的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！