Question

好的，我觉得这个问题仍然是旧的****，但在尝试了谷歌的所有可用方法之后，我真的无法理解。这是我得到的错误：

isSocketAllowedBySecurityPolicy start : device null
getBluetoothService() called with no BluetoothManagerCallback
connect(), SocketState: INIT, mPfd: {ParcelFileDescriptor: FileDescriptor[59]}

我正在尝试编写一个可用于连接微控制器的简单android程序。我使用BroadcastReceiver接收发现的设备。代码如下所示：

private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();

        // When discovery finds a device
        if (BluetoothDevice.ACTION_FOUND.equals(action)) {
            // Get the BluetoothDevice object from the Intent
            BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
            if (uuidExtra == null) {
                Log.d("Bluetooth", "=+=+=+=+ 1st return uuid is null.");
            }

            if (device.getName().equals("DeviceIWant")) {
                mDevice = device;
                mStatus.setText("");
                mStatus.append("\n" + mDevice.getName() + "\n" + mDevice.getAddress());
            }
            String str = device.getName() + "\n" + device.getAddress();
            Log.d("Bluetooth", "\n=+=+=+=+=+=+=+=+=+ Get in onReceive");
            Log.d("Bluetooth", str);
            // mBluetoothAdapter.startDiscovery();
        }

        if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
            // Check if the desired device has been found yet.
            if (mDevice != null) {
                Log.d("Bluetooth", "\n=+=+=+=+ BT dev is not null.");
                // If the desired device has been found, start getting the   UUID
                mDevice.fetchUuidsWithSdp();
            }
        }

        if (BluetoothDevice.ACTION_UUID.equals(action)) {
            Log.d("Bluetooth", "\n=+=+=+=+ BT dev uuid returned.");
            // Observe the UUID
            Parcelable[] uuidExtra =         intent.getParcelableArrayExtra(BluetoothDevice.EXTRA_UUID);

            Parcelable uuidExtra[] = mDevice.getUuids();
            if (uuidExtra == null ) {
                Log.d("Bluetooth", "\n=+=+=+=+ return uuid is null.");
            }
            Log.d("Bluetooth", "\n=+=+=+=+ uuid Extra returned.");
            // Log.d("Bluetooth", "UUID: " + uuidExtra[0].toString());

            // Create the thread (it is not yet run)
            mThread = new ConnectThread(mDevice);
            // Start running the thread
            mThread.start();
            // Update the thread flag
            isThreadRunning = true;
        }

        if (BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)) {
            // Observe the UUID
            Log.d("Bluetooth", "\n=+=+=+=+ BT dev discovery ps started.");
        }

        if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
            // Observe the UUID
            Log.d("Bluetooth", "\n=+=+=+=+ BT dev discovery ps DONE!");
        }
    }
};

当我尝试使用mSocket.connect（）时发生错误，其中mSocket是BluetoothSocket的一个实例。套接字是使用以下代码行创建的：

device.createInsecureRfcommSocketToServiceRecord(MY_UUID);

我使用的设备是由我在上面的代码中保存为mDevice的广播返回的。套接字的创建似乎很好。我用非常着名的SPP UUID（00001101-0000-1000-8000-00805F9B34FB）来建立连接而没有运气。我还尝试使用

从设备中获取UUID

mDevice.fetchUuidsWithSdp();

跟随

Parcelable[] uuidExtra = intent.getParcelableArrayExtra(BluetoothDevice.EXTRA_UUID);

但问题是返回的uuidExtra始终为null。当我连接时，错误是相同的。

我希望问题描述清楚。如果您需要更多代码来解决问题，请告诉我们。感谢您阅读问题和帮助的时间！

BluetoothSocket.connect

0 个答案: