移植dlib+opencv到android

2018年11月18日 2018年11月26日

如果我们只是把dlib移植到android只需添加如下内容到 cmakelist.txt中

include(${CMAKE_SOURCE_DIR}/src/main/cpp/dlib-19.16/dlib/cmake)
target_link_libraries( # Specifies the target library.
        native-lib
        dlib
        # Links the target library to the log library
        # included in the NDK.
        ${log-lib})

include(${CMAKE_SOURCE_DIR}/src/main/cpp/dlib-19.16/dlib/cmake)

target_link_libraries( # Specifies the target library.

native-lib

dlib

# Links the target library to the log library

# included in the NDK.

${log-lib})

如果要这样玩的话没啥意思，因为dlib里面大部分功能需要依赖opencv，所以你可以看一下我前面写的一篇opencv移植到android免OpenCV Manager

我这里改动了一下，把dlib和opencv sdk放到了cpp目录下面，libopencv_java3.so还是放到jniLibs对应平台下面

cmakelist.txt

# For more information about using CMake with Android Studio, read the
# documentation: https://d.android.com/studio/projects/add-native-code.html

# Sets the minimum version of CMake required to build the native library.

cmake_minimum_required(VERSION 3.4.1)
#
set(CMAKE_VERBOSE_MAKEFILE on)
set(libs "${CMAKE_SOURCE_DIR}/src/main/jniLibs")
include_directories(${CMAKE_SOURCE_DIR}/src/main/cpp/OpenCV-android-sdk/sdk\native/jni/include)
add_library(libopencv_java3 SHARED IMPORTED )
set_target_properties(libopencv_java3 PROPERTIES
        IMPORTED_LOCATION "${libs}/${ANDROID_ABI}/libopencv_java3.so")

include(${CMAKE_SOURCE_DIR}/src/main/cpp/dlib-19.16/dlib/cmake)

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11 -fexceptions -frtti")

#set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI})
#
# Creates and names a library, sets it as either STATIC
# or SHARED, and provides the relative paths to its source code.
# You can define multiple libraries, and CMake builds them for you.
# Gradle automatically packages shared libraries with your APK.
add_library( # Sets the name of the library.
        native-lib

        # Sets the library as a shared library.
        SHARED

        # Provides a relative path to your source file(s).
        src/main/cpp/native-lib.cpp
        src/main/cpp/mydlib.cpp)

# Searches for a specified prebuilt library and stores the path as a
# variable. Because CMake includes system libraries in the search path by
# default, you only need to specify the name of the public NDK library
# you want to add. CMake verifies that the library exists before
# completing its build.

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)

# Specifies libraries CMake should link to your target library. You
# can link multiple libraries, such as libraries you define in this
# build script, prebuilt third-party libraries, or system libraries.
target_link_libraries( # Specifies the target library.
        native-lib
        libopencv_java3
        dlib
        # Links the target library to the log library
        # included in the NDK.
        ${log-lib})

# For more information about using CMake with Android Studio, read the

# documentation: https://d.android.com/studio/projects/add-native-code.html

# Sets the minimum version of CMake required to build the native library.

cmake_minimum_required(VERSION 3.4.1)

set(CMAKE_VERBOSE_MAKEFILE on)

set(libs "${CMAKE_SOURCE_DIR}/src/main/jniLibs")

include_directories(${CMAKE_SOURCE_DIR}/src/main/cpp/OpenCV-android-sdk/sdk\native/jni/include)

add_library(libopencv_java3 SHARED IMPORTED )

set_target_properties(libopencv_java3 PROPERTIES

IMPORTED_LOCATION "${libs}/${ANDROID_ABI}/libopencv_java3.so")

include(${CMAKE_SOURCE_DIR}/src/main/cpp/dlib-19.16/dlib/cmake)

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11 -fexceptions -frtti")

#set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI})

# Creates and names a library, sets it as either STATIC

# or SHARED, and provides the relative paths to its source code.

# You can define multiple libraries, and CMake builds them for you.

# Gradle automatically packages shared libraries with your APK.

add_library( # Sets the name of the library.

native-lib

# Sets the library as a shared library.

SHARED

# Provides a relative path to your source file(s).

src/main/cpp/native-lib.cpp

src/main/cpp/mydlib.cpp)

# Searches for a specified prebuilt library and stores the path as a

# variable. Because CMake includes system libraries in the search path by

# default, you only need to specify the name of the public NDK library

# you want to add. CMake verifies that the library exists before

# completing its build.

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)

# Specifies libraries CMake should link to your target library. You

# can link multiple libraries, such as libraries you define in this

# build script, prebuilt third-party libraries, or system libraries.

target_link_libraries( # Specifies the target library.

native-lib

libopencv_java3

dlib

# Links the target library to the log library

# included in the NDK.

${log-lib})

build.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "com.godgou.dlibtoandroid"
        minSdkVersion 23
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        externalNativeBuild {
            cmake {
                arguments "-DANDROID_STL=c++_shared","-DANDROID_ARM_NEON=TRUE", "-DANDROID_TOOLCHAIN=clang","-DCMAKE_BUILD_TYPE=Release"
                //abiFilters "armeabi-v7a","arm64-v8a","x86","x86_64"//,"armeabi","mips","mips64"
                cppFlags "-std=c++11 -frtti -fexceptions"
            }
        }
        ndk{
            abiFilters "armeabi-v7a","arm64-v8a","x86","x86_64"//,"armeabi","mips","mips64"
        }

    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    externalNativeBuild {
        cmake {
            path "CMakeLists.txt"
        }
    }
}

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    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'
    implementation project(':openCVLibrary343')
}

apply plugin: 'com.android.application'

android {

compileSdkVersion 28

defaultConfig {

applicationId "com.godgou.dlibtoandroid"

minSdkVersion 23

targetSdkVersion 28

versionCode 1

versionName "1.0"

testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

externalNativeBuild {

cmake {

arguments "-DANDROID_STL=c++_shared","-DANDROID_ARM_NEON=TRUE", "-DANDROID_TOOLCHAIN=clang","-DCMAKE_BUILD_TYPE=Release"

//abiFilters "armeabi-v7a","arm64-v8a","x86","x86_64"//,"armeabi","mips","mips64"

cppFlags "-std=c++11 -frtti -fexceptions"

}

ndk{

abiFilters "armeabi-v7a","arm64-v8a","x86","x86_64"//,"armeabi","mips","mips64"

}

buildTypes {

release {

minifyEnabled false

proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'

}

externalNativeBuild {

cmake {

path "CMakeLists.txt"

}

dependencies {

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

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'

implementation project(':openCVLibrary343')

}

MainActivity.JAVA

public class MainActivity extends AppCompatActivity {

    // Used to load the 'native-lib' library on application startup.
    static {
        System.loadLibrary("opencv_java3");
        System.loadLibrary("native-lib");
    }
}

public class MainActivity extends AppCompatActivity {

// Used to load the 'native-lib' library on application startup.

static {

System.loadLibrary("opencv_java3");

System.loadLibrary("native-lib");

}

如果报错：More than one file was found with OS independent path ‘lib/${ANDROID_ABI}/*.so’

解决方法：
注释掉cmakelist.txt中的

set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI})

1	set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI})

再把jniLibs目录下对应${ANDROID_ABI}报错的.so文件删除掉

如果报错:
DLIB_NO_GUI_SUPPORT is defined so you can’t use the GUI….
Also make sure you have libx11-dev installed….

解决方法：
注释DLIB_NO_GUI_SUPPORT的error指令。打开dlib/gui_core/gui_core_kernel_2.h，修改为下面的代码。

#ifdef DLIB_NO_GUI_SUPPORT
//#error "DLIB_NO_GUI_SUPPORT is defined so you can't use the GUI code.  Turn DLIB_NO_GUI_SUPPORT off if you want to use it."
//#error "Also make sure you have libx11-dev installed on your system"
#endif

#ifdef DLIB_NO_GUI_SUPPORT

//#error "DLIB_NO_GUI_SUPPORT is defined so you can't use the GUI code. Turn DLIB_NO_GUI_SUPPORT off if you want to use it."

//#error "Also make sure you have libx11-dev installed on your system"

#endif

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