我正在尝试在Android中使用Android Beacon Library检测信标。我创建了一个在后台运行并检测信标的服务。
问题是当蓝牙关闭时应用程序没有检测到信标。但如果我打开蓝牙工作正常。还有一个非常奇怪的事情。如果我在应用程序运行时再次关闭蓝牙,它仍然会继续检测。这意味着BLE检测工作正常,但只有当我打开蓝牙并再次关闭它时。
如何启用BLE检测?我的实现如下。我想念一下吗?
Beacon服务类
public class BeaconDiscoverer extends Service implements BeaconConsumer {
private static final String TAG = BeaconDiscoverer.class.getSimpleName();
private static BeaconManager beaconManager;
private static Region region;
private BackgroundPowerSaver backgroundPowerSaver;
public BeaconDiscoverer() {
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onCreate() {
region = new Region("myRangingUniqueId", 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"));
configureBatterySaverMode();
beaconManager.bind(this);
}
@Override
public void onDestroy() {
beaconManager.unbind(this);
super.onDestroy();
}
private void configureBatterySaverMode() {
BeaconManager.setAndroidLScanningDisabled(true);
backgroundPowerSaver = new BackgroundPowerSaver(getApplicationContext());
// set the duration of the scan to be 5 seconds
beaconManager.setBackgroundScanPeriod(Utility.convertToMilliseconds(2));
// set the time between each scan to be 1 min (60 seconds)
beaconManager.setBackgroundBetweenScanPeriod(Utility.convertToMilliseconds(25));
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.d(TAG, "BeaconDiscoverer started up");
return super.onStartCommand(intent, flags, startId);
}
@Override
public void onBeaconServiceConnect() {
Log.d(TAG, "onBeaconServiceConnect");
beaconManager.setRangeNotifier(new RangeNotifier() {
@Override
public void didRangeBeaconsInRegion(Collection<Beacon> beacons, Region region) {
if (beacons.size() > 0) {
Beacon firstBeacon = beacons.iterator().next();
Log.i(TAG, "Beacon detected: " + firstBeacon.getDistance() + " m. - " + firstBeacon.getBluetoothAddress());
}
}
});
startRanging();
}
public void stopRanging() {
try {
beaconManager.stopRangingBeaconsInRegion(region);
} catch (RemoteException e) {
e.printStackTrace();
}
}
public void startRanging() {
if (User.currentUser() == null)
return;
try {
beaconManager.startRangingBeaconsInRegion(region);
} catch (RemoteException e) {
e.printStackTrace();
}
}
}
申请类
public class App extends Application {
private static final String TAG = App.class.getSimpleName();
@Override
public void onCreate() {
super.onCreate();
startService(new Intent(this, BeaconDiscoverer.class));
}
}
答案 0 :(得分:4)
简单回答:您必须启用蓝牙才能使用库检测信标。信标使用蓝牙LE来宣传它们的存在,并且必须打开蓝牙无线电才能听到信号。
我无法解释为什么在关闭蓝牙后继续检测信标。一种可能性是,您只需从内存缓存中查看它们,即库的短暂扫描周期,然后才会消失。另一种可能性是Android设备在关闭时关闭蓝牙,但实际上并没有关闭。
典型的方法是在启动应用程序时检测蓝牙是否已关闭,并提示用户将其打开。参考应用程序中有示例代码执行此操作here。
答案 1 :(得分:0)
private void registerBoradcastReceiver() {
IntentFilter stateChangeFilter = new IntentFilter(
BluetoothAdapter.ACTION_STATE_CHANGED);
IntentFilter connectedFilter = new IntentFilter(
BluetoothDevice.ACTION_ACL_CONNECTED);
//IntentFilter connectedFilter = new IntentFilter(BluetoothAdapter.ACTION_CONNECTION_STATE_CHANGED);
IntentFilter disConnectedFilter = new IntentFilter(
BluetoothDevice.ACTION_ACL_DISCONNECTED);
registerReceiver(stateChangeReceiver, stateChangeFilter);
registerReceiver(stateChangeReceiver, connectedFilter);
registerReceiver(stateChangeReceiver, disConnectedFilter);
}
private BroadcastReceiver stateChangeReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothDevice.ACTION_ACL_CONNECTED == action) {
startService;
}
if (BluetoothDevice.ACTION_ACL_DISCONNECTED == action) {
stopService;
}
if (BluetoothAdapter.ACTION_STATE_CHANGED == action) {
}
}
};