Android Studio 编译Jar

在对应的库的build.gradle添加

task deleteJar(type: Delete) {
    delete 'libs/mylibrary.jar'
}           

task exportjar(type: Copy) {
    from('build/intermediates/aar_main_jar/release/')
    into('libs/')
    include('classes.jar')
    rename('classes.jar', 'mylibrary.jar')
}

exportjar.dependsOn(deleteJar, build)

在终端界面输入gradlew exportjar
生成文件路径：libs/mylibrary.jar

导入方法：将生成的mylibrary.jar复制到工程目录下的/libs/，然后在AndroidStudio中右键mylibrary.jar->Add as library

或者在build.gradle中添加

dependencies {
    implementation files('libs/mylibrary.jar')
}