Easy way to create Android jar files

I’m adding support to serial port on our tablet device and this is the way I create a jar file to let external application to recognize the Android Serial API:

$ mkdir -p android/serialport
$ cp target/common/obj/JAVA_LIBRARIES/android_stubs_current_intermediates/classes/android/serialport/SerialPortFinder.class android/serialport/
$ cp target/common/obj/JAVA_LIBRARIES/android_stubs_current_intermediates/classes/android/serialport/SerialPort.class android/serialport/
$ jar cvf serial.jar android/serialport/SerialPort.class android/serialport/SerialPortFinder.class

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