using the altbeacon lib in the background it only detects the beacons only some of the times or at least only fires the app to the frontground only some times. Below is the logs when it doesn't detect and when it detected well.
04-20 17:10:07.335 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ cancel wakeup alarm: PendingIntent{422554f0: android.os.BinderProxy@42255480}
04-20 17:10:07.365 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Set a wakeup alarm to go off in 300000 ms: PendingIntent{42256498: android.os.BinderProxy@42256428}
04-20 17:10:07.925 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ starting a new scan cycle
04-20 17:10:07.925 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ starting a new bluetooth le scan
04-20 17:10:07.925 24817-24817/com.mobinteg.ibeacon D/BluetoothAdapter﹕ startLeScan(): null
04-20 17:10:07.945 24817-24833/com.mobinteg.ibeacon D/BluetoothAdapter﹕ onClientRegistered() - status=0 clientIf=5
04-20 17:10:07.955 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Waiting to stop scan cycle for another 1100 milliseconds
04-20 17:10:07.965 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ cancel wakeup alarm: PendingIntent{42256498: android.os.BinderProxy@42256428}
04-20 17:10:07.985 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Set a wakeup alarm to go off in 300000 ms: PendingIntent{422577d0: android.os.BinderProxy@42257760}
04-20 17:10:07.985 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Scan started
04-20 17:10:08.765 24817-24832/com.mobinteg.ibeacon D/BluetoothAdapter﹕ onScanResult() - Device=D6:06:36:3A:71:B3 RSSI=-63
04-20 17:10:08.765 24817-24832/com.mobinteg.ibeacon D/CycledLeScannerForJellyBeanMr2﹕ got record
04-20 17:10:08.765 24817-25200/com.mobinteg.ibeacon D/BeaconParser﹕ This is not a matching Beacon advertisement. (Was expecting be ac. The bytes I see are: 0201041bff4c000215ebefd08370a247c89837e7b5634df52400010001cb5f00000000000000000000000000000000000000000000000000000000000000
04-20 17:10:08.765 24817-25200/com.mobinteg.ibeacon D/BeaconParser﹕ This is a recognized beacon advertisement -- 02 15 seen
04-20 17:10:08.765 24817-25200/com.mobinteg.ibeacon D/BeaconService﹕ beacon detected multiple times in scan cycle : id1: ebefd083-70a2-47c8-9837-e7b5634df524 id2: 1 id3: 1
04-20 17:10:08.765 24817-25200/com.mobinteg.ibeacon D/BeaconService﹕ beacon detected : id1: ebefd083-70a2-47c8-9837-e7b5634df524 id2: 1 id3: 1
04-20 17:10:08.775 24817-25200/com.mobinteg.ibeacon D/BeaconService﹕ looking for ranging region matches for this beacon
04-20 17:10:08.985 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Waiting to stop scan cycle for another 71 milliseconds
04-20 17:10:08.985 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ cancel wakeup alarm: PendingIntent{422577d0: android.os.BinderProxy@42257760}
04-20 17:10:08.995 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Set a wakeup alarm to go off in 300000 ms: PendingIntent{4225b930: android.os.BinderProxy@4225b8c0}
04-20 17:10:09.065 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Done with scan cycle
04-20 17:10:09.065 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ stopping bluetooth le scan
04-20 17:10:09.075 24817-24817/com.mobinteg.ibeacon D/BluetoothAdapter﹕ stopLeScan()
04-20 17:10:09.085 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Normalizing between scan period from 15000 to 14915
04-20 17:10:09.085 24817-24817/com.mobinteg.ibeacon D/CycledLeScannerForJellyBeanMr2﹕ Waiting to start next bluetooth scan for another 14915 milliseconds
when it fires well it appears as:
04-20 17:10:56.225 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ starting a new scan cycle
04-20 17:10:56.225 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ starting a new bluetooth le scan
04-20 17:10:56.225 24817-24817/com.mobinteg.ibeacon D/BluetoothAdapter﹕ startLeScan(): null
04-20 17:10:56.235 24817-24833/com.mobinteg.ibeacon D/BluetoothAdapter﹕ onClientRegistered() - status=0 clientIf=5
04-20 17:10:56.245 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Waiting to stop scan cycle for another 1100 milliseconds
04-20 17:10:56.245 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ cancel wakeup alarm: PendingIntent{422922d0: android.os.BinderProxy@42292260}
04-20 17:10:56.285 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Set a wakeup alarm to go off in 300000 ms: PendingIntent{42293608: android.os.BinderProxy@42293598}
04-20 17:10:56.285 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Scan started
04-20 17:10:56.995 24817-24832/com.mobinteg.ibeacon D/BluetoothAdapter﹕ onScanResult() - Device=D6:06:36:3A:71:B3 RSSI=-68
04-20 17:10:56.995 24817-24832/com.mobinteg.ibeacon D/CycledLeScannerForJellyBeanMr2﹕ got record
04-20 17:10:56.995 24817-24865/com.mobinteg.ibeacon D/BeaconParser﹕ This is not a matching Beacon advertisement. (Was expecting be ac. The bytes I see are: 0201041bff4c000215ebefd08370a247c89837e7b5634df52400010001cb6100000000000000000000000000000000000000000000000000000000000000
04-20 17:10:57.005 24817-24865/com.mobinteg.ibeacon D/BeaconParser﹕ This is a recognized beacon advertisement -- 02 15 seen
04-20 17:10:57.005 24817-24865/com.mobinteg.ibeacon D/BeaconService﹕ beacon detected multiple times in scan cycle : id1: ebefd083-70a2-47c8-9837-e7b5634df524 id2: 1 id3: 1
04-20 17:10:57.015 24817-24865/com.mobinteg.ibeacon D/BeaconService﹕ beacon detected : id1: ebefd083-70a2-47c8-9837-e7b5634df524 id2: 1 id3: 1
04-20 17:10:57.015 24817-24865/com.mobinteg.ibeacon D/Callback﹕ attempting callback via intent: ComponentInfo{com.mobinteg.ibeacon/org.altbeacon.beacon.BeaconIntentProcessor}
04-20 17:10:57.025 24817-24865/com.mobinteg.ibeacon D/BeaconService﹕ looking for ranging region matches for this beacon
04-20 17:10:57.035 24817-25231/com.mobinteg.ibeacon D/BeaconIntentProcessor﹕ got an intent to process
04-20 17:10:57.035 24817-25231/com.mobinteg.ibeacon D/BeaconIntentProcessor﹕ got monitoring data
04-20 17:10:57.045 24817-25231/com.mobinteg.ibeacon D/BeaconIntentProcessor﹕ Calling monitoring notifier: com.mobinteg.ibeacon.Background@420719f8
04-20 17:10:57.045 24817-25231/com.mobinteg.ibeacon D/testbackground﹕ Region id1: null id2: null id3: null
04-20 17:10:57.045 24817-25231/com.mobinteg.ibeacon D/testbackground﹕ Got a didEnterRegion call
04-20 17:10:57.285 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Waiting to stop scan cycle for another 63 milliseconds
04-20 17:10:57.285 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ cancel wakeup alarm: PendingIntent{42293608: android.os.BinderProxy@42293598}
04-20 17:10:57.295 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Set a wakeup alarm to go off in 300000 ms: PendingIntent{422a1e20: android.os.BinderProxy@422a1db0}
04-20 17:10:57.355 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Done with scan cycle
04-20 17:10:57.355 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ stopping bluetooth le scan
04-20 17:10:57.355 24817-24817/com.mobinteg.ibeacon D/BluetoothAdapter﹕ stopLeScan()
the code is the follow
public class Background extends Application implements BootstrapNotifier{
private static final String TAG = "testbackground";//".MyApplicationName";
private static final String UUID = "EBEFD08370A247C89837E7B5634DF524";//"ebefd083-70a2-47c8-9837-e7b5634df524";//
//private BackgroundPowerSaver backgroundPowerSaver;//to able battery saving
private RegionBootstrap regionBootstrap;
private BeaconManager beaconManager;
@Override
public void onCreate() {
super.onCreate();
beaconManager.setDebug(true);
// Simply constructing this class and holding a reference to it in your custom Application class
// enables auto battery saving of about 60%
//backgroundPowerSaver = new BackgroundPowerSaver(this);
Region region = new Region(".Background",null,null,null);
beaconManager = BeaconManager.getInstanceForApplication(this);
beaconManager.getBeaconParsers().add(new BeaconParser()
.setBeaconLayout("m:2-3=0215,i:4-19,i:20-21,i:22-23,p:24-24,d:25-25"));
try{
// set the duration of the scan to be 1.1 seconds
beaconManager.setBackgroundScanPeriod(1100l);
// set the time between each scan to be 1 hour (3600 seconds)//50000l
beaconManager.setBackgroundBetweenScanPeriod(15000l);//3600000l
beaconManager.updateScanPeriods();
//beaconManager.startMonitoringBeaconsInRegion(region);
} catch (RemoteException e) {
//Log.e(TAG, "Cannot talk to service");
}
// wake up the app when any beacon is seen (you can specify specific id filers in the parameters below)
regionBootstrap = new RegionBootstrap(Background.this, region);
}
@Override
public void didDetermineStateForRegion(int state, Region region) {
// Don't care
Log.d(TAG, "Region " + region.toString());
}
@Override
public void didEnterRegion(Region arg0) {
Log.d(TAG, "Got a didEnterRegion call");
// This call to disable will make it so the activity below only gets launched the first time a beacon is seen (until the next time the app is launched)
// if you want the Activity to launch every single time beacons come into view, remove this call.
//regionBootstrap.disable();
Intent intent = new Intent(this, MainActivity.class);
// IMPORTANT: in the AndroidManifest.xml definition of this activity, you must set android:launchMode="singleInstance" or you will get two instances
// created when a user launches the activity manually and it gets launched from here.
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
//beaconManager.setBackgroundMode(false);
this.startActivity(intent);
}
@Override
public void didExitRegion(Region arg0) {
// Don't care
}
}
The two log excerpts both show normal operations. In the first case, a beacon is detected when the device is already inside the beacon region (e.g. a beacon is already visible). The didEnterRegion callback is therefore not called.
In the second case, a beacon is detected when the device is not already inside the beacon region (e.g. when no beacons are currently visible). The didEnterRegion callback is therefore called.
In order for you to get a second callback to the didEnterRegion method, you must wait long enough for the device to detect that no beacons are around. Based on the background settings of scanning for 1.1 seconds every 15 seconds, this can take 21.1 seconds to happen (15 seconds + 1.1 seconds + 5 seconds to disappear). So you must turn off a beacon for just over 20 seconds (or move the Android device away from all beacons for this time) before you can get a second call to didEnterRegion.