循环中的 BootstrapNotifier 回调

Question

我的信标检测有问题。

有时，应用程序会循环通过 BootstrapNotifier 回调 (didDetermineStateForRegion(int arg0, Region arg1)、didEnterRegion(Region arg0) 和 didExitRegion(Region arg0))。

有时在我启动应用程序时发生，其他时候是在应用程序处于后台时...我没有找到任何模式，因此我不知道问题出在哪里。

循环是这样的（只有一段日志）：

D/MyApplication: Got a didDetermineStateForRegion call: 2f234454-cf6d-4a0f-adf2-f4911ba9ffa6
D/MyApplication: Got a didEnterRegion call: 2f234454-cf6d-4a0f-adf2-f4911ba9ffa6
D/MyApplication: Got a didDetermineStateForRegion call: 2f234454-cf6d-4a0f-adf2-f4911ba9ffa6
D/MyApplication: Got a didExitRegion call: null
D/MyApplication: Got a didDetermineStateForRegion call: 2f234454-cf6d-4a0f-adf2-f4911ba9ffa6
D/MyApplication: Got a didEnterRegion call: 2f234454-cf6d-4a0f-adf2-f4911ba9ffa6
D/MyApplication: Got a didDetermineStateForRegion call: 2f234454-cf6d-4a0f-adf2-f4911ba9ffa6
D/MyApplication: Got a didExitRegion call: null
D/MyApplication: Got a didDetermineStateForRegion call: 2f234454-cf6d-4a0f-adf2-f4911ba9ffa6
D/MyApplication: Got a didEnterRegion call: 2f234454-cf6d-4a0f-adf2-f4911ba9ffa6
D/MyApplication: Got a didDetermineStateForRegion call: 2f234454-cf6d-4a0f-adf2-f4911ba9ffa6
D/MyApplication: Got a didExitRegion call: null
D/MyApplication: Got a didDetermineStateForRegion call: 2f234454-cf6d-4a0f-adf2-f4911ba9ffa6
D/MyApplication: Got a didEnterRegion call: 2f234454-cf6d-4a0f-adf2-f4911ba9ffa6
D/MyApplication: Got a didDetermineStateForRegion call: 2f234454-cf6d-4a0f-adf2-f4911ba9ffa6
D/MyApplication: Got a didExitRegion call: null
D/MyApplication: Got a didDetermineStateForRegion call: 2f234454-cf6d-4a0f-adf2-f4911ba9ffa6
D/MyApplication: Got a didEnterRegion call: 2f234454-cf6d-4a0f-adf2-f4911ba9ffa6
D/MyApplication: Got a didDetermineStateForRegion call: 2f234454-cf6d-4a0f-adf2-f4911ba9ffa6
D/MyApplication: Got a didExitRegion call: null
D/MyApplication: Got a didDetermineStateForRegion call: 2f234454-cf6d-4a0f-adf2-f4911ba9ffa6
D/MyApplication: Got a didEnterRegion call: 2f234454-cf6d-4a0f-adf2-f4911ba9ffa6

为什么会发生？该应用程序检测到该区域，但不会立即启动信标扫描。此循环或多或少一分钟后，扫描通常开始（但并非总是如此）。

为了测试应用程序，我使用这个信标软件模拟器作为发射器 (https://github.com/WebBluetoothCG/ble-test-peripheral-android)

----------------更新------------

我的代码：

public class BeaconApplication extends Application implements BootstrapNotifier, BeaconConsumer {

    private String TAG = "MyApplication";
    private BeaconManager beaconManager;
    private Region region;


    @Override
    public void onCreate() {
        super.onCreate();
        startBeaconScan();
    }

    public void startBeaconScan() {

        Log.d(TAG, "App started up");

        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"));  //iBeacon layout

        beaconManager.setRegionStatePeristenceEnabled(false);
        beaconManager.bind(this);

        region = new Region("myMonitoringUniqueId", Identifier.parse("2f234454-cf6d-4a0f-adf2-f4911ba9ffa6"), null, null);
        new RegionBootstrap(this, region);
    }

    @Override
    public void didDetermineStateForRegion(int arg0, Region arg1) {
        beaconManager.addRangeNotifier(new RangeNotifier() {
            @Override
            public void didRangeBeaconsInRegion(Collection<Beacon> beacons, Region region) {
               //CODE FOR BEACON DETECTION    
            }
        });

        try {
            beaconManager.startRangingBeaconsInRegion(region);
        } catch (RemoteException e) {
            e.printStackTrace();
        }
        Log.d(TAG, "Got a didDetermineStateForRegion call: " + arg1.getId1());
    }

    @Override
    public void didEnterRegion(Region arg0) {
        Log.d(TAG, "Got a didEnterRegion call: " + arg0.getId1());
    }

    @Override
    public void didExitRegion(Region arg0) {
        Log.d(TAG, "Got a didExitRegion call: " + arg0.getBluetoothAddress());
    }

    @Override
    public void onBeaconServiceConnect() {
        try {
            beaconManager.setBackgroundBetweenScanPeriod(500);
            beaconManager.setBackgroundScanPeriod(500);
            beaconManager.setForegroundBetweenScanPeriod(500);
            beaconManager.setForegroundScanPeriod(500);
            beaconManager.updateScanPeriods();
        } catch (RemoteException e) {
            e.printStackTrace();
        }
    }
}

我已经尝试在 "onBeaconServiceConnect()" 回调中使用 "beaconManager.startRangingBeaconsInRegion(region);"，但似乎没有任何区别。

Answer 1

有两件事可能导致此问题：

设置如此短的扫描周期可能会有问题，除非您确定要测试的信标以 10Hz 或更高的频率传输。这是因为 500 毫秒不足以检测数据包，并且当您在扫描开启和关闭之间循环时，无线电会关闭一段时间。我会延长扫描周期（至少 1100 毫秒）以查看问题是否消失。
库版本 2.10 中引入了一个错误，该错误可能会导致区域在后台退出。我怀疑它能否解决如此短的扫描周期的问题。尝试定位库版本 2.9，或者您可以使用 instructions to try 2.11-beta1.

一些其他提示：

没有理由在使用RegionBootstrap时调用bind()，否则会导致后台模式切换出现问题。您可以将自定义扫描周期代码放在您设置 BeaconParser 的位置旁边，然后只需取出对 updateScanPeriods() 的调用，因为只有在扫描开始后更改扫描周期时才需要它。
除非您激活 BackgroundPowerSaver class 或以编程方式更改 beaconManager 的后台模式，否则不会使用后台扫描周期。除非您执行其中一项操作，否则将始终使用前台扫描周期。

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