我正在尝试像这样从远程蓝牙设备获取 UUIDS:

        device.fetchUuidsWithSdp();

这将在所有设备上静默运行，无需用户交互，Android 6.0 除外，Android 6.0 明显要求通过配对对话框连接远程设备以获取 UUID。这是预期的行为吗？这在哪里记录？有没有一种方法可以触发 UUID 发现而无需从另一端明确允许它？

最佳答案

我找到了解决此问题的方法，方法是使用隐藏的 sdpSearch 方法而不是 fetchUuidsWithSdp。这需要一点反射(reflection)。这在 android 6.0 和 5.1.1 上对我有用，没有尝试配对的设备。 希望这会有所帮助，并随时改进相当糟糕的异常处理。

public class DeviceFinder{

public interface Callback{
    void onDeviceFound(BluetoothDevice bd);
    void onFinishedCallback();
    void onStartCallback();
}

private ArrayList<BluetoothDevice> tempDevices = new ArrayList<>();
private Callback mCallback;
private Context mContext;
private String ACTION_SDP_RECORD;
private String EXTRA_SDP_SEARCH_RESULT;

private BroadcastReceiver mReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if (BluetoothDevice.ACTION_FOUND.equals(action)){
            // Aggregating found devices
            BluetoothDevice bd = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
            tempDevices.add(bd);
        }else if (BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)){
            // Prepare for new search
            tempDevices = new ArrayList<>();
            mCallback.onStartCallback();
        }else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)){
            // Do a sdpSearch for all found devices
            for (BluetoothDevice bd : tempDevices){
                try {
                    Method m = bd.getClass().getDeclaredMethod("sdpSearch", ParcelUuid.class);
                    m.invoke(bd, new ParcelUuid(/* your uuid here */));
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
            mCallback.onFinishedCallback();
        }else if( ACTION_SDP_RECORD.equals(action)){
            // check if the device has the specified uuid
            BluetoothDevice bd = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
            if (intent.getIntExtra(EXTRA_SDP_SEARCH_RESULT, 1) == 0){
                mCallback.onDeviceFound(bd);
            }
        }
    }
};


public DeviceFinder(Context context, Callback mCallback){
    this.mCallback = mCallback;
    this.mContext = context;

    try {
        Field f = BluetoothDevice.class.getDeclaredField("ACTION_SDP_RECORD");
        ACTION_SDP_RECORD = ((String)f.get(null));
        f = BluetoothDevice.class.getDeclaredField("EXTRA_SDP_SEARCH_STATUS");
        EXTRA_SDP_SEARCH_RESULT = ((String)f.get(null));
    } catch (Exception e) {
        e.printStackTrace();
    }


    IntentFilter intentFilter = new IntentFilter();
    intentFilter.addAction(BluetoothDevice.ACTION_FOUND);
    intentFilter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED);
    intentFilter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
    intentFilter.addAction(ACTION_SDP_RECORD);
    context.registerReceiver(mReceiver, intentFilter);
    startScan();
}

public void startScan(){
    BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
    if (!bluetoothAdapter.isDiscovering()) {
        bluetoothAdapter.startDiscovery();
    }
}

public void unregisterReciever(){
    mContext.unregisterReceiver(mReceiver);
}
}

编辑: sdpSearch 是在android 6.0 中添加的，所以它不适用于早期版本

关于Android 6.0 获取 UUIDS 时请求与远程设备配对，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/33661814/