support the structure of arm32, arm64, and x86 at the same time?

[xujingzhou]

Hi, What should I do to enable the generated jni. so library to support the structure of arm32, arm64, and x86 at the same time?

[saudet]

You mean using something like Apple's compiler? We can create platform properties based on the default ones available here:
https://github.com/bytedeco/javacpp/tree/master/src/main/resources/org/bytedeco/javacpp/properties
BTW, contributions are welcome, so please open a pull request to have your new properties included there! Thanks

[xujingzhou]

You mean using something like Apple's compiler? We can create platform properties based on the default ones available here: https://github.com/bytedeco/javacpp/tree/master/src/main/resources/org/bytedeco/javacpp/properties BTW, contributions are welcome, so please open a pull request to have your new properties included there! Thanks

I want to support android. so I want to support: abiFilters += listOf("armeabi-v7a", "arm64-v8a", "x86_64")

[saudet]

I don't believe Android supports libraries that can support multiple architectures. If you're not asking about libraries that can support multiple architectures, you'll need to clarify your question to get a useful answer.

[xujingzhou]

Sorry, I am trying to generate an.aar file for android with internal contents ("armeabi-v7a", "ar64-v8a ", "x86_64").

[xujingzhou]

Thanks. I'm going to try an example as below:
https://github.com/bytedeco/sample-projects/blob/master/javacpp-android-gradle/app/build.gradle

[saudet]

Right, you probably want to use Gradle JavaCPP for that: https://github.com/bytedeco/gradle-javacpp

[xujingzhou]

The following error was encountered when compiling the following example.

sample as below:
https://github.com/bytedeco/sample-projects/blob/master/javacpp-android-gradle/

Error as below:
++javacpp file path:/root/.gradle/caches/modules-2/files-2.1/org.bytedeco/javacpp/1.5.8/a28ca7c27abaae8054060b963fbd667b4be72677/javacpp-1.5.8.jar
/home/android-sdk/ndk/24.0.8215888
/root/.gradle/caches/modules-2/files-2.1/org.bytedeco/javacpp/1.5.8/a28ca7c27abaae8054060b963fbd667b4be72677/javacpp-1.5.8.jar

FAILURE: Build failed with an exception.

• What went wrong:
  A problem occurred configuring project ':app'.

Cannot create variant 'android-manifest-metadata' after dependency configuration ':app:debugApiElements' has been resolved

[saudet]

Please try to use Gradle JavaCPP instead: https://github.com/bytedeco/gradle-javacpp

[xujingzhou]

The follow sample has been fixed.

Sample: https://github.com/bytedeco/sample-projects/blob/master/javacpp-android-gradle/

grade: 6.9.3
com.android.tools.build:gradle:4.2.0

Fixed build.gradle:

apply plugin: 'com.android.application'
def ndkPath

android {
    compileSdkVersion 27
    buildToolsVersion "28.0.3"
    defaultConfig {
        applicationId "idl.baidu.com.javacppgradle"
        minSdkVersion 22
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        externalNativeBuild {
            cmake {
                cppFlags "-std=c++11 -frtti -fexceptions"
            }
        }
        ndk {
            // Specifies the ABI configurations of your native
            // libraries Gradle should build and package with your APK.
            abiFilters 'x86', 'x86_64', 'armeabi-v7a','arm64-v8a'
        }
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }

    lintOptions {
       abortOnError false
    }

    externalNativeBuild {
        android {
            externalNativeBuild {
                ndkPath = '/home/android-sdk/ndk/21.4.7075529'
            }
        }
        cmake {
            path "CMakeLists.txt"
        }
    }
    sourceSets.main {
        jniLibs.srcDir 'src/main/libs'
        jni.srcDirs = [] //disable automatic ndk-build call
    }
}

android.applicationVariants.all { variant ->
    println("-----------------------")
    println 'variant.name: ' + variant.name
    def projectDir = project.projectDir.absolutePath
    def classesDir = variant.javaCompileProvider.get().destinationDir
    def jniDir = file("$projectDir/src/main/cpp/").absolutePath
    println("projectDir: " + projectDir)
    println("classesDir: " + classesDir)
    println("jniDir: " + jniDir)
    println("ndkPath: " + ndkPath)
    // NOTE: The functionlity of javacpp is create jni cpp file from java code.++++++++++++++++
    // javacpp workflow:
    // 1.generate jni cpp file by javacpp-java code file.
    // 2.nkd build with android.mk
    variant.javaCompileProvider.get().doLast {
        println '===javacpp start==='
        javaexec {
            main = 'org.bytedeco.javacpp.tools.Builder'
            //NOTE: jar version must be same with the dependency jar.
            classpath = files("$projectDir/javacpp-platform-1.5.8-bin/javacpp.jar")
            args '-cp', "$classesDir",
                    '-properties', 'android-arm',
                    '-Dplatform.root=' + ndkPath,
                    '-Dplatform.compiler=' + ndkPath + '/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-g++',
                    //NOTE: include path will auto work by javacpp.jar 1.1 version.(see Android.mk)
//                    "-Dplatform.includepath=" + includePath+"/include:" +includePath+"/libs/armeabi/include",
                    "-nocompile", "idl.baidu.cpp.*",
                    "-d", "${jniDir}" // jni file destination folder.
        }
        println '===javacpp done==='
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:27.1.1'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    implementation 'org.bytedeco:javacpp:1.5.8'
}

[saudet]

Great! Please open a pull request: https://github.com/bytedeco/sample-projects/pulls

[lancewoo]

The follow sample has been fixed.

Sample: https://github.com/bytedeco/sample-projects/blob/master/javacpp-android-gradle/

grade: 6.9.3 com.android.tools.build:gradle:4.2.0

Fixed build.gradle:

apply plugin: 'com.android.application'
def ndkPath

android {
    compileSdkVersion 27
    buildToolsVersion "28.0.3"
    defaultConfig {
        applicationId "idl.baidu.com.javacppgradle"
        minSdkVersion 22
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        externalNativeBuild {
            cmake {
                cppFlags "-std=c++11 -frtti -fexceptions"
            }
        }
        ndk {
            // Specifies the ABI configurations of your native
            // libraries Gradle should build and package with your APK.
            abiFilters 'x86', 'x86_64', 'armeabi-v7a','arm64-v8a'
        }
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }

    lintOptions {
       abortOnError false
    }

    externalNativeBuild {
        android {
            externalNativeBuild {
                ndkPath = '/home/android-sdk/ndk/21.4.7075529'
            }
        }
        cmake {
            path "CMakeLists.txt"
        }
    }
    sourceSets.main {
        jniLibs.srcDir 'src/main/libs'
        jni.srcDirs = [] //disable automatic ndk-build call
    }
}

android.applicationVariants.all { variant ->
    println("-----------------------")
    println 'variant.name: ' + variant.name
    def projectDir = project.projectDir.absolutePath
    def classesDir = variant.javaCompileProvider.get().destinationDir
    def jniDir = file("$projectDir/src/main/cpp/").absolutePath
    println("projectDir: " + projectDir)
    println("classesDir: " + classesDir)
    println("jniDir: " + jniDir)
    println("ndkPath: " + ndkPath)
    // NOTE: The functionlity of javacpp is create jni cpp file from java code.++++++++++++++++
    // javacpp workflow:
    // 1.generate jni cpp file by javacpp-java code file.
    // 2.nkd build with android.mk
    variant.javaCompileProvider.get().doLast {
        println '===javacpp start==='
        javaexec {
            main = 'org.bytedeco.javacpp.tools.Builder'
            //NOTE: jar version must be same with the dependency jar.
            classpath = files("$projectDir/javacpp-platform-1.5.8-bin/javacpp.jar")
            args '-cp', "$classesDir",
                    '-properties', 'android-arm',
                    '-Dplatform.root=' + ndkPath,
                    '-Dplatform.compiler=' + ndkPath + '/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-g++',
                    //NOTE: include path will auto work by javacpp.jar 1.1 version.(see Android.mk)
//                    "-Dplatform.includepath=" + includePath+"/include:" +includePath+"/libs/armeabi/include",
                    "-nocompile", "idl.baidu.cpp.*",
                    "-d", "${jniDir}" // jni file destination folder.
        }
        println '===javacpp done==='
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:27.1.1'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    implementation 'org.bytedeco:javacpp:1.5.8'
}

You may check this project gradle-javacpp-android or this one