java - Android:为什么我无法以编程方式与蓝牙设备配对，即使使用 BLUETOOTH_PRIVILEGED 并设置配对确认

Question

我目前正在尝试以编程方式将我的 Android 设备 (4.4.2 KitKat) 与 .NET 项目中的蓝牙适配器配对。

与用户输入( key 对话框)的正常配对有效，但我想绕过用户输入。

经过一番研究(here and here)，我设法想出了一些代码，但对话框仍然出现。

下面我有我的权限:

<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<uses-permission android:name="android.permission.READ_PROFILE" />
<uses-permission android:name="android.permission.READ_CONTACTS" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-permission android:name="android.permission.BLUETOOTH_PRIVILEGED" />

最低API级别设置为19，所以我应该拥有蓝牙特权。

配对特定设备的代码:

    final String SERVER_MAC = "00:1A:7D:DA:71:07";
    final BluetoothAdapter ba = BluetoothAdapter.getDefaultAdapter();
    final ArrayList<BluetoothDevice> server = new ArrayList<>();
    ba.startDiscovery();
    BroadcastReceiver btReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if(BluetoothDevice.ACTION_FOUND.equals(action)){
                BluetoothDevice bd = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                Log.d(TAG,"Found device: " + bd.getName() + " : " + bd.getAddress());
                if(bd.getAddress().equals(SERVER_MAC)){
                    Log.d(TAG,"Server bluetooth found");
                    server.add(bd);
                    Log.d(TAG,"creating bond");
                    bd.createBond();
                    ba.cancelDiscovery();

                }
            }
            else if(BluetoothDevice.ACTION_PAIRING_REQUEST.equals(action)){
                Log.d(TAG,"setting info");
                setBluetoothPairingPin(server.get(0));
            }
        }
    };
    IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
    registerReceiver(btReceiver, filter);
    IntentFilter pairingRequest = new IntentFilter(BluetoothDevice.ACTION_PAIRING_REQUEST);
    registerReceiver(btReceiver,pairingRequest);

以及 ACTION_PAIRING_REQUEST 方法:

    byte[] pairingPin = "123456".getBytes();
    try{
        Log.d(TAG,"Trying to set pin");
        bluetoothDevice.getClass().getMethod("setPin", byte[].class).invoke(bluetoothDevice,pairingPin);
        Log.d(TAG,"Success setting pin");
        try{
            bluetoothDevice.getClass().getMethod("setPairingConfirmation", boolean.class).invoke(bluetoothDevice, true);

            Log.d(TAG,"Success setting pairing confirmtion");
        }
        catch(Exception e){
            Log.d(TAG,"Exception: " + e.getMessage());
        }
    }
    catch(Exception e){
        Log.d(TAG,"Exception 2: " + e.getMessage());
    }

任何信息都会有帮助。谢谢!

Answer 1

不要要求BLUETOOTH_PRIVILEGED，它可以在 Android 7 之前的版本上运行。在这些版本上，只需要 BLUETOOTH_ADMIN。然后更改为:https://android.googlesource.com/platform/packages/apps/Bluetooth/+/android-7.0.0_r24