无法运行从服务中发现蓝牙

Question

我无法运行从服务启动发现（用于蓝牙）。服务运行通过 WakefulBroadcastReceiver（通过计时器）从睡眠中恢复。服务源代码：

    public class LocationService extends Service implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, LocationListener {

    private static final String TAG = "LocationService";
    private BluetoothAdapter btAdapter = BluetoothAdapter.getDefaultAdapter();

    @Override
    public void onCreate() {
       super.onCreate();
       Log.d(TAG, "Service onCreate");

       IntentFilter filter = new IntentFilter();
       filter.addAction(BluetoothDevice.ACTION_FOUND);
       filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED);
       filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
       registerReceiver(mBTReceiver, filter);
     }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.d(TAG, "Service onStartCommand");
        BTscanner();    
        return START_NOT_STICKY;
    }

    @Override
    public void onDestroy() {
       super.onDestroy();
       if (btAdapter != null) {
          btAdapter.cancelDiscovery();
       }
    unregisterReceiver(mBTReceiver);
    }

    private void BTscanner() {
       Log.e(TAG, "==BT: Run BTscanner");           
       btAdapter.cancelDiscovery();
       btAdapter.startDiscovery();
       Log.e(TAG, "==BT: End BTscanner");
    }

    private final BroadcastReceiver mBTReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if (BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)) {
            Log.e(TAG, "==BT: Started");
        } else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
            Log.e(TAG, "==BT: Finished");
        } else if (BluetoothDevice.ACTION_FOUND.equals(action)) {
            BluetoothDevice device = (BluetoothDevice) intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);

            Log.e(TAG, "==BT: " + device.getAddress());
        }
    }

    };


 }

在日志中我看到：

Service onStartCommand
==BT: Run BTscanner
==BT: End BTscanner

但没看到：

==BT: Started
==BT: Finished

和发现的设备列表。

在 Manifest 中安装了所有权限：

<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />

并在 Manifest 的应用领域启用服务：

<service
            android:name=".LocationService"
            android:enabled="true"
            android:exported="true" />

我做错了什么？ Tnx.

Answer 1

您确定您的接收器在有时间处理任何操作之前没有在 onDestroy 方法中注销吗？我会在其中设置一个断点以查看其中发生了什么？

Answer 2

我想，我找到了解决办法。

我在智能手机上安装和运行启用蓝牙的应用程序时出现问题。

安装应用程序和手册后deactivate/activate蓝牙设备一切正常。

可能是某种硬件故障。

然后重新安装应用两次，问题没有重复

无法运行从服务中发现蓝牙

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无法 运行 从服务中发现蓝牙

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无法运行从服务中发现蓝牙