Question

我尝试使用Android Beacon Library来检测iBeacons，但它不起作用。

logcat的输出只是：

I/SELinux﹕ Function: selinux_android_load_priority [0], There is no sepolicy file. I/SELinux﹕ Function: selinux_android_load_priority , spota verifySig and checkHash pass. priority version is VE=SEPF_GT-I9195_4.4.2_0046 I/SELinux﹕ selinux_android_seapp_context_reload: seapp_contexts file is loaded from /data/security/spota/seapp_contexts E/dalvikvm﹕ >>>>> Normal User E/dalvikvm﹕ >>>>> com.cyberland.felix.ibeaconexample [ userId:0 | appId:10176 ] D/dalvikvm﹕ Late-enabling CheckJNI I/PersonaManager﹕ getPersonaService() name persona_policy D/BeaconParser﹕ Parsing beacon layout: m:2-3=beac,i:4-19,i:20-21,i:22-23,p:24-24,d:25-25 D/BeaconParser﹕ Parsing beacon layout: m:2-3=0215,i:4-19,i:20-21,i:22-23,p:24-24 W/ModelSpecificDistanceCalculator﹕ Cannot find match for this device. Using default W/ModelSpecificDistanceCalculator﹕ Cannot find match for this device. Using default E/MonitoringStatus﹕ Deserialization exception, message: $s

然后只是

D/BluetoothAdapter﹕ stopLeScan()

一次又一次......

我刚从官方网页修改了这个例子：

public class MainActivity extends Activity implements BeaconConsumer {
protected static final String TAG = "MainActivity";
private BeaconManager beaconManager;
private static final int PERMISSION_REQUEST_COARSE_LOCATION = 1;

private BluetoothAdapter mBluetoothAdapter;



@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    /*
    mBluetoothAdapter = ((BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE)).getAdapter();
    mBluetoothAdapter.startLeScan(new BluetoothAdapter.LeScanCallback() {
        @Override
        public void onLeScan(final BluetoothDevice device, int rssi, byte[] scanRecord) {
            Log.d(TAG, "Scanned BLE device with mac: " + device.getAddress());
        }
    });
     */
    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"));
    beaconManager.bind(this);




}


@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) {    }
}

我希望你能帮助我！

祝你好运，菲利克斯

Answer 1

嗯，官方示例（android-beacon-library-reference）产生相同的输出。我无法解释这一点。

Answer 2

看起来问题可能与未授予在设备上扫描的正确权限有关。为了测试这个理论，请将以下代码添加到主活动的onCreate方法中，并查看它返回的内容。下面显示了我在Nexus 5X上看到的示例输出。

        try {
            PackageInfo info = getPackageManager().getPackageInfo(this.getPackageName(), PackageManager.GET_PERMISSIONS);
            Log.d(TAG, "SDK "+Build.VERSION.SDK_INT+" App Permissions:");
            if (info.requestedPermissions != null) {
                for (String p : info.requestedPermissions) {
                    int grantResult = this.checkPermission(p, android.os.Process.myPid(), android.os.Process.myUid());
                    if (grantResult == PackageManager.PERMISSION_GRANTED) {
                        Log.d(TAG, p+" PERMISSION_GRANTED");
                    }
                    else {
                        Log.d(TAG, p+" PERMISSION_DENIED: "+grantResult);
                    }
                }
            }
        } catch (Exception e) {
            Log.d(TAG, "Cannot get permissions due to error", e);
        }

示例输出：

04-17 12:04:01.943 30624-30624/? D/MonitoringActivity: SDK 23 App Permissions:
04-17 12:04:01.944 30624-30624/? D/MonitoringActivity: android.permission.INTERNET PERMISSION_GRANTED
04-17 12:04:01.945 30624-30624/? D/MonitoringActivity: android.permission.BLUETOOTH PERMISSION_GRANTED
04-17 12:04:01.945 30624-30624/? D/MonitoringActivity: android.permission.BLUETOOTH_ADMIN PERMISSION_GRANTED
04-17 12:04:01.946 30624-30624/? D/MonitoringActivity: android.permission.RECEIVE_BOOT_COMPLETED PERMISSION_GRANTED
04-17 12:04:01.946 30624-30624/? D/MonitoringActivity: android.permission.ACCESS_COARSE_LOCATION PERMISSION_GRANTED

如果您在设备的输出中看到上述任何权限丢失，则解决方案可能是手动将ACCESS_COARSE_LOCATION位置权限添加到AndroidManifest.xml。如果您看到PERMISSION_DENIED，则可能是另一个问题。您可以在设备上开始信标扫描之前跳过权限检查，这可以通过暂时将您的Android Beacon Library版本降级为2.7而不进行此检查来实现。

检测到iBeacon的Android Beacon Library失败了！不公平:(

2 个答案: