This is the APK of PL2303G on Android system.
It can support PL2303G series (GC/GT/GL/GE/GS/GR...) chips.
This is just a simple USB terminal test program on Android, not for use in the above specific device applications, such as GPS, cashier, modem,...etc..
You can download the source code from prolific website and then develop your own Android application...
https://www.prolific.com.tw/TW/CustomerLogin.aspx