Android Beacon Tutorial (Building the Detector - Listener - Observer)

1.java

private void setScanFilter() {
  ScanFilter.Builder mBuilder = new ScanFilter.Builder();
  ByteBuffer mManufacturerData = ByteBuffer.allocate(23);
  ByteBuffer mManufacturerDataMask = ByteBuffer.allocate(24);
  byte[] uuid = getIdAsByte(UUID.fromString("0CF052C297CA407C84F8B62AAC4E9020");
  mManufacturerData.put(0, (byte)0xBE);
  mManufacturerData.put(1, (byte)0xAC);
  for (int i=2; i<=17; i++) {
    mManufacturerData.put(i, uuid[i-2]);
  }
  for (int i=0; i<=17; i++) {
    mManufacturerDataMask.put((byte)0x01);
  }
  mBuilder.setManufacturerData(224, mManufacturerData.array(), mManufacturerDataMask.array());
  mScanFilter = mBuilder.build();
}

10.java

public void getAdOfTheDay(int major, int minor) {        
  try {    
    pubnub.subscribe()
    .channels(Arrays.asList("my_channel")) // subscribe to channels
    .execute();
  } catch (PubnubException e) {
    System.out.println(e.toString());
  }
}

11.java

SubscribeCallback subscribeCallback = new SubscribeCallback() {
    @Override
    public void status(PubNub pubnub, PNStatus status) {
 
    }
 
    @Override
    public void message(PubNub pubnub, PNMessageResult message) {
 
    }
 
    @Override
    public void presence(PubNub pubnub, PNPresenceEventResult presence) {
 
    }
};
 
pubnub.addListener(subscribeCallback);

2.java

private void setScanSettings() {
  ScanSettings.Builder mBuilder = new ScanSettings.Builder();
  mBuilder.setReportDelay(0);
  mBuilder.setScanMode(ScanSettings.SCAN_MODE_LOW_POWER);
  mScanSettings = mBuilder.build();
}

3.java

mBluetoothLeScanner.startScan(Arrays.asList(mScanFilter), mScanSettings, mScanCallback);

4.java

protected ScanCallback mScanCallback = new ScanCallback() {
    @Override
    public void onScanResult(int callbackType, ScanResult result) {
        ScanRecord mScanRecord = result.getScanRecord();
        int[] manufacturerData = mScanRecord.getManufacturerSpecificData(224);
        int mRssi = result.getRssi();
    }
}

5.java

public double calculateDistance(int txPower, double rssi) {
  if (rssi == 0) {
    return -1.0; // if we cannot determine accuracy, return -1.
  }
  double ratio = rssi*1.0/txPower;
  if (ratio < 1.0) {
    return Math.pow(ratio,10);
  }
  else {
    double accuracy =  (0.89976)*Math.pow(ratio,7.7095) + 0.111;
    return accuracy;
  }
}

6.java

private String getDistance(accuracy) {
  if (accuracy == -1.0) {
    return "Unknown";
  } else if (accuracy < 1) {
    return "Immediate";
  } else if (accuracy < 3) {
    return "Near";
  } else {
    return "Far";
  }
}

7.xml

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

8.java

PNConfiguration pnConfiguration = new PNConfiguration();
pnConfiguration.setSubscribeKey("demo");
pnConfiguration.setPublishKey("demo");
     
PubNub pubnub = new PubNub(pnConfiguration);

9.java

@Override
public void onScanResult(int callbackType, ScanResult result) {
  [...]
  if ((mBeaconScanRecord.getDistance() == "Immediate") && !isSubscribed()) {
    getAdOfTheDay(mIBeaconScanRecord.getMajor(), mIBeaconScanRecord.getMinor());
  }
}