A dirty and quick example of serial port communication in Android

Since I released UsbSerial I have received good feedback about its performance but I also have received messages with some legit doubts about how to use it. I finally overcame laziness and I have publish a little example of how to use UsbSerial correctly in a real app. Here it is the source code, just two java source code files 🙂

Disclaimer: If you are looking for a serial terminal for Android, DroidTerm is what you need, this is just a quick example

An overall description of how it works:
– UsbService.java contains a Service to isolate all Usb operations. Interesting things happens there. If you need to change baud rate, stop bits and son those lines are located there. It is a good pattern to implement open connections in a Service so I encourage you to do it this way.

– When App starts, UsbService is created and will try to connect with an attached usb device. if there is one device compatible it will connect with it and data will be able to be sent and received. If no devices are attached, it will inform the user through a toast. The app will be still listening for new usb attached devices.

– Data received will appear in the white box, Send button will send the data wrote into the EditText.


Although pretty simple and it does not have any particular goal (besides being an explanatory app), it could have some bugs so If you find something just let me know opening an issue on github.

Happy coding!