How to make a .jar out from an Android Studio project

• Open build.gradle for library project
  

• Write two tasks in build.gradle — deleteJar and createJar and add rule createJar.dependsOn(deleteJar, build)
  

The code from above:

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

task createJar(type: Copy) {
    from('build/intermediates/bundles/release/')
    into('libs/jars/')
    include('classes.jar')
    rename('classes.jar', 'logmanagementlib.jar')
}

createJar.dependsOn(deleteJar, build)

• Expand gradle panel from right and open all tasks under yourlibrary->others. You will see two new tasks there — createJar and deleteJar
  

• Double click on createJar
  

• Once the task run successfully, get your generated jar from path mentioned in createJar task i.e. libs/xxxx.jar
  

• copy the newly generated jar into your required project’s lib folder–>right click–>select “add as library”