Question

当设备与任何设备配对时，我应该收到通知，如果它发现任何配对设备，我应该收到通知。如何使用广播接收器实现此目的

Answer 1

//Try this snippet and handle the 
 Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
   // If there are paired devices 
   if (pairedDevices.size() > 0) {
   // Loop through paired devices 
   for (BluetoothDevice device : pairedDevices) {
   // Add the name and address to an array adapter to show in a ListView 

   mArrayAdapter.add(device.getName() + "\n" + device.getAddress());

   //or handle here with notification.....
  } 
}

Answer 2

根据您的评论，我了解您希望在蓝牙连接后显示附近是否有配对的蓝牙设备..

首先，在BluetoothDevice.ACTION_ACL_CONNECTED之后，您需要开始扫描配对的蓝牙设备并将其显示在列表中。在移动设备的环境中，蓝牙设备可以是：

1）未知

2）配对的

3）连接

了解配对和连接的蓝牙设备之间的区别非常重要。配对设备了解彼此的存在并共享链接密钥，该密钥可用于进行身份验证，从而产生连接。一旦建立加密连接，设备就会自动配对。

蓝牙设备由BluetoothDevice对象表示。可以通过调用getBondedDevices（）方法获得配对设备列表。

在您的活动课程中

 public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        BTAdapter = BluetoothAdapter.getDefaultAdapter();
        if (!BTAdapter.isEnabled()) {
            Intent enableBT = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(enableBT, REQUEST_BLUETOOTH);
        }
        Log.d("DEVICELIST", "Super called for DeviceListFragment onCreate\n");
        deviceItemList = new ArrayList<DeviceItem>();

        Set<BluetoothDevice> pairedDevices = bTAdapter.getBondedDevices();
        }
    if (pairedDevices.size() > 0) {
    for (BluetoothDevice device : pairedDevices) {
        DeviceItem newDevice= new DeviceItem(device.getName(),device.getAddress(),"false");
        deviceItemList.add(newDevice);
    }
}

然后创建一个新的clsss DevicelistFragment来创建一个BroadcastReceiver并覆盖onReceive（）方法。只要找到蓝牙设备，就会调用onReceive（）方法。

    public class DeviceListFragment extends Fragment implements AbsListView.OnItemClickListener{

    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_deviceitem_list, container, false);
    ToggleButton scan = (ToggleButton) view.findViewById(R.id.scan);
    ...
    scan.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
            if (isChecked) {
                mAdapter.clear();
                getActivity().registerReceiver(bReciever, filter);
                bTAdapter.startDiscovery();
            } else {
                getActivity().unregisterReceiver(bReciever);
                bTAdapter.cancelDiscovery();
            }
        }
    });
}
    ...
    private final BroadcastReceiver bReciever = new BroadcastReceiver() {
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (BluetoothDevice.ACTION_FOUND.equals(action)) {
                BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                // Create a new device item
                DeviceItem newDevice = new DeviceItem(device.getName(), device.getAddress(), "false");
                // Add it to our adapter
                mAdapter.add(newDevice);
            }
        }
    };
    }

有关完整项目，请参阅https://github.com/tutsplus/Android-BluetoothScannerFinishedProject

另见：http://www.londatiga.net/it/programming/android/how-to-programmatically-scan-or-discover-android-bluetooth-device/

Answer 3

//you can get notified when a new device is connected using Broadcast receiver


BroadcastReceiver btReceive=new BroadcastReceiver() {
  @Override 
  public void onReceive(Context context, Intent intent) {

    String action = intent.getAction();
    BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);

      if (BluetoothDevice.ACTION_FOUND.equals(action)) {
       //the device is found 
     } 
   } 
};

如何在每次蓝牙设备与任何设备配对时以及当设备发现任何配对设备获得通知时收到通知？

3 个答案: