Question

我正在我的Application类中运行beacon，如下所示：

if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
        beaconManager = new BeaconManager(getApplicationContext());
        beaconManager.setBackgroundScanPeriod(5000, 25000);
        beaconManager.setMonitoringListener(new BeaconManager.MonitoringListener() {
            @Override
            public void onEnteredRegion(Region region, List<Beacon> list) {


            }

            @Override
            public void onExitedRegion(Region region) {

            }
        });
        beaconManager.connect(new BeaconManager.ServiceReadyCallback() {
            @Override
            public void onServiceReady() {

                beaconManager.startMonitoring(new Region("rid", null, null, null));
            }
        });

    }

它正确地在我的设备上运行，但在模拟器中它崩溃了。因为模拟器没有蓝牙支持。所以我的问题是如果真正的设备没有蓝牙将会发生什么？如果它会崩溃怎么能阻止它？是否有可能高于4.3的Android设备没有蓝牙？

 E/BluetoothAdapter: Bluetooth binder is null
java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.bluetooth.BluetoothAdapter.isEnabled()' on a null object reference
                                                               at com.estimote.sdk.service.internal.JellyBeanBluetoothAdapter.start(JellyBeanBluetoothAdapter.java:43)
                                                               at com.estimote.sdk.service.internal.CycleBluetoothScanner.start(CycleBluetoothScanner.java:64)
                                                               at com.estimote.sdk.service.BeaconService.startScanning(BeaconService.java:336)
                                                               at com.estimote.sdk.service.BeaconService.startMonitoring(BeaconService.java:286)
                                                               at com.estimote.sdk.service.BeaconService.access$300(BeaconService.java:69)
                                                               at com.estimote.sdk.service.BeaconService$IncomingHandler$1.run(BeaconService.java:440)
                                                               at android.os.Handler.handleCallback(Handler.java:751)
                                                               at android.os.Handler.dispatchMessage(Handler.java:95)
                                                               at android.os.Looper.loop(Looper.java:154)
                                                               at android.os.HandlerThread.run(HandlerThread.java:61)

Answer 1

BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (bluetoothAdapter == null) {
    //Bluetooth is not supported
} else{
    //Bluetooth is supported
}

也不要忘记在清单中添加蓝牙权限。

如果Android设备在信标运行时没有支持蓝牙，会发生什么

1 个答案: