beacon.java

public class RangingActivity extends Activity implements BeaconConsumer {
    protected static final String TAG = "RangingActivity";
    private BeaconManager beaconManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_ranging);
		
		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
			// Android M Permission check
			if (this.checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
				final AlertDialog.Builder builder = new AlertDialog.Builder(this);
				builder.setTitle("This app needs location access");
				builder.setMessage("Please grant location access so this app can detect beacons.");
				builder.setPositiveButton(android.R.string.ok, null);
				builder.setOnDismissListener(new DialogInterface.OnDismissListener() {
						@Override
						public void onDismiss(DialogInterface dialog) {
								requestPermissions(new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, PERMISSION_REQUEST_COARSE_LOCATION);
						}
				});
				builder.show();
			}
		}
		
        beaconManager = BeaconManager.getInstanceForApplication(this);
        // To detect proprietary beacons, you must add a line like below corresponding to your beacon
        // type.  Do a web search for "setBeaconLayout" to get the proper expression.
        beaconManager.getBeaconParsers().add(new BeaconParser().setBeaconLayout("m:2-3=0215,i:4-19,i:20-21,i:22-23,p:24-24"));
        beaconManager.bind(this);
    }
	
	@Override
	public void onRequestPermissionsResult(int requestCode,
											   String permissions[], int[] grantResults) {
		switch (requestCode) {
			case PERMISSION_REQUEST_COARSE_LOCATION: {
				if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
					Log.d(TAG, "coarse location permission granted");
				} else {
					final AlertDialog.Builder builder = new AlertDialog.Builder(this);
					builder.setTitle("Functionality limited");
					builder.setMessage("Since location access has not been granted, this app will not be able to discover beacons when in the background.");
					builder.setPositiveButton(android.R.string.ok, null);
					builder.setOnDismissListener(new DialogInterface.OnDismissListener() {

						@Override
						public void onDismiss(DialogInterface dialog) {
						}

					});
					builder.show();
				}
				return;
			}
		}
	}
	
    @Override 
    protected void onDestroy() {
        super.onDestroy();
        beaconManager.unbind(this);
    }
	
    @Override
    public void onBeaconServiceConnect() {
        beaconManager.setRangeNotifier(new RangeNotifier() {
            @Override 
            public void didRangeBeaconsInRegion(Collection<Beacon> beacons, Region region) {
                if (beacons.size() > 0) {
                    Log.i(TAG, "The first beacon I see is about "+beacons.iterator().next().getDistance()+" meters away.");        
                }
            }
        });

        try {
            beaconManager.startRangingBeaconsInRegion(new Region("myRangingUniqueId", null, null, null));
        } catch (RemoteException e) {    }
    }
}