onEnteredRegion和onBeaconsDiscovered有什么区别，
以下代码有问题吗，怎么监测不到设备进入区域

beaconManager.setMonitoringListener(new MonitoringListener() {

@Override

public void onEnteredRegion(BRTRegion arg0, List<BRTBeacon> arg1) {

//postNotification("进入感应区域");

Toast.makeText(AllDemosActivity.this, "进入感应区域", Toast.LENGTH_LONG).show();

}

@Override

public void onExitedRegion(BRTRegion arg0, List<BRTBeacon> arg1) {

//postNotification("离开感应区域");

Toast.makeText(AllDemosActivity.this, "离开感应区域", Toast.LENGTH_LONG).show();

}

});