This is a demo of Bluetooth on Android.
It involves all of Bluetooth functions required for a Bluetooth Client, which inlucdes:

1, discovery bluetooth devices available around.
2, programmably pair / unpaire with other bluetooth devices.
3, monitor the state change of bluetooth device, which includes the change from paired to unpaired, and paring to paired.
4, enable bluetooth on android.
5, send and receive data with other bluetooth device.