SerialPort/serialport/build.gradle

apply plugin: 'com.android.library'

android {
    compileSdkVersion 28
    buildToolsVersion '28.0.3'

    defaultConfig {
        minSdkVersion 19
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        externalNativeBuild {
            cmake {
                arguments '-DANDROID_TOOLCHAIN=clang'
            }
        }
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }

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

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

    implementation 'com.android.support:appcompat-v7:28.0.0'
    testImplementation 'junit:junit:4.13'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
    androidTestImplementation('com.android.support.test.espresso:espresso-core:3.0.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
}

// 生成 jar 包并修改名字
task makeJar(type: Copy) {
    // 删除已经存在的 jar 包，如果有的话
    delete 'build/libs/SerialPort.jar'
    // 从该目录下加载要打包的文件，注意文件夹名称有可能为 default，也可能是 release
    from('build/intermediates/bundles/release/')
    // jar 包的保存目录
    into('build/libs/')
    // 设置过滤，只打包classes文件
    include('classes.jar')
    // 重命名 jar 包
    rename('classes.jar', 'SerialPort.jar')
}
makeJar.dependsOn(build)