如何从服务发送数据，即使关闭应用程序

Question

我正在使用Alt信标库进行信标扫描。我在服务班扫描信标。我想继续扫描信标，即使应用程序也关闭了。但如果关闭，应用程序服务停止，信标不扫描。我试过了，但是我没有。请帮助我，谢谢
//MainActivity

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
 setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
 setContentView(R.layout.activity_main);
    Intent intent = new Intent(MainActivity.this, ScaningService.class);
    startService(intent);//starting service
    getApplicationContext().bindService(intent, mConnection, Context.BIND_AUTO_CREATE);//bounding service
}  
@Override
protected void onResume() {
    super.onResume();
}
@Override
protected void onPause() {
    super.onPause();
}
@Override
protected void onDestroy() {
    super.onDestroy();
}
private ServiceConnection mConnection = new ServiceConnection() {
    @Override
    public void onServiceConnected(ComponentName className,
                                   IBinder service) {           

    }
    @Override
    public void onServiceDisconnected(ComponentName arg0) {

    }
};

//服务类

public class ScaningService extends Service implements BeaconConsumer {
public BeaconManager beaconManager;
public MainActivity activity;  
private final IBinder mBinder = new SimpleServiceBinder();  

public class SimpleServiceBinder extends Binder {
    public ScaningService getService() {
        return ScaningService.this;
    }
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
    return mBinder;
}

@Override
public void onCreate() {
    super.onCreate();
    handler = new Handler();
    beaconManager = BeaconManager.getInstanceForApplication(getBaseContext());
    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"));
    beaconManager.setBackgroundMode(true);
    beaconManager.setBackgroundScanPeriod(1100);//this will set how long a bluetooth should scan
    beaconManager.setBackgroundBetweenScanPeriod(2000);//this will set bluetooth scanning interval        
    beaconManager.bind(ScaningService.this);
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    return START_STICKY;
}
@Override
public boolean onUnbind(Intent intent) {
    return super.onUnbind(intent);
}
@Override
public void onDestroy() {      
    super.onDestroy();
}
@Override
public void onBeaconServiceConnect() {
    beaconManager.setRangeNotifier(new RangeNotifier() {
        @Override
        public void didRangeBeaconsInRegion(Collection<Beacon> beacons, Region region) {
            if (beacons.size() > 0) {
                beacon = beacons.iterator().next();
                Log.e(TAG, " UUID: " + beacon.getId1());// this is not showing and i tried toast also                 
        }
    });
    try {           
        beaconManager.startRangingBeaconsInRegion(new Region("sBeacon", null, null, null));            
    } catch (RemoteException e) {
        Log.i(TAG, "RemoteException: " + e);
    }
}

}

Answer 1

是的，这是可能的。如果配置得当，Android Beacon Library会在你的应用被关闭后5分钟内在后台恢复扫描。在范围回调中，您可以将数据与扫描结果一起发送到服务器，尽管您可能需要在新线程(使用Handler或类似结构)上这样做。

上面的项目网站上的例子应该能让你大致了解。您将需要在自定义Application类中组合背景启动和范围。

EDIT:看到发布的代码后，很明显问题是扫描是从自定义服务触发的。虽然这可以工作，但要让它正常工作要困难得多，所以扫描重新启动被杀死的应用程序。遵循使用RegionBootstrap触发使用自定义Application类的背景检测的示例要简单得多。