Combine iBeacon bluetooth low energy with Android

问题:

I'm looking for a way to detect iBeacon (iOS 7.0 feature) from an Android device. I read the Android documentation, where it seem that the iBeacon is some kind of GATT server which sends its position. While the Android documentation says that I should not poll that data, but for the detection this would be nessesary.

I google a lot but this topic is quite new (I even created a new tag ibeacon) so I would be happy if I get some links to ressources from the iOS world which descripes the implementation. Also if there are some Android libs which I did not find yet would be nice.

回答1:

EDIT: The library below has now been taken down, but a replacement library is now available here:

https://github.com/AltBeacon/android-beacon-library

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I have ported the iOS7 iBeacon SDKs to Android, and was able to see standard iBeacons and estimate their range. The code is available here:

https://github.com/RadiusNetworks/android-ibeacon-service

For this to work, you need Android 4.3 which introduced the Low Energy Bluetooth APIs. You also need a device with a low energy bluetooth chipset.

If you don't want to use the full library above, you can roll your own. iBeacons simply transmit a BLE advertisement once per second that start with a known sequence of bytes. You simply have to tell Android to do a BLE scan, get each advertisement, and look for one that starts with the known iBeacon byte sequence. You can then parse out the iBeacon fields. Here is the code the shows how this is done:

https://github.com/RadiusNetworks/android-ibeacon-service/blob/master/src/com/radiusnetworks/ibeacon/IBeacon.java#L177-L231

回答2:

The only catch here is to detect beacon even the app is not running. Unlike iOS7, it is not natively support. In iOS7, when you on your BT, it will automatically notify you when you enter the region of registered iBeacon.

I had implemented iBeacon in Android 4.3 API using IntentService plus AlarmManager. To do a scan every 30 sec( to save your battery power, it shall be longer). It works well for user. Only when the matching uuid/major/minor is found, then it will trigger notifications. Otherwise, it will sleep and wake up for scanning again.

i think this is the solution for your question.

回答3:

I didn't quite get what you mean, could you provide links to the documentation which said that you should not poll the data?

But it seems to me that the iBeacon is working as a server, which is kind of funny to me. Isn't it meant to find other devices, not the phone itself?

https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.position_quality.xml

This is the characteristics it uses though. To me it sounds like that the devices you are looking for are the "beacons" and the phone itself is just a listener. So you would not poll the EHPE and EVPE data but you should actually listen to it's changes or "broadcasts".

I'm kind of new to this myself also and couldn't find any really specific documentation.

Though, be advised, in the link I provided there is download link in the top corner which will provide you the full documentation in PDF format. There you will probably find more answers.