Download Prolific PL2303 Multi Port
This is PL2303HXD multi port APK on Android. It can support 4 * PL2303HXD (RA / EA).
You can download the source code from Prolific web-site, and then develop your own android application
– USB Device with PL2303HXD, PL2303EA or PL2303RA controller chip
NOTE: PL2303HXA and PL2303XA are not supported (Discontinued Products)
– Android-Powered Device (Tablet/Phones) with USB Host Mode Support
– Android 3.2 and above OS versions