无法从蓝牙发送和接收任何数据

Question

我有一个基于蓝牙的简单发送器/接收器android应用。成功建立了两个电话之间的连接。但是数据没有发送和接收。

编码我尝试过的内容：

public class MainActivity extends Activity
{
    TextView myLabel;
    EditText myTextbox;
    BluetoothAdapter mBluetoothAdapter;
    BluetoothSocket mmSocket;
    BluetoothDevice mmDevice;
    OutputStream mmOutputStream;
    InputStream mmInputStream;
    Thread workerThread;
    byte[] readBuffer;
    int readBufferPosition;
    volatile boolean stopWorker;

    void findBT()
    {
        mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
        if(mBluetoothAdapter == null)
        {
            myLabel.setText("No bluetooth adapter available");
        }

        if(!mBluetoothAdapter.isEnabled())
        {
            Intent enableBluetooth = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(enableBluetooth, 0);
        }

        Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
        if(pairedDevices.size() > 0)
        {
            for(BluetoothDevice device : pairedDevices)
            {
                String deviceName = device.getName();
                deviceName=deviceName.replaceAll("[^A-Za-z]+", "");
                //String deviceHardwareAddress = device.getAddress(); // MAC address
                Log.i("## name : ",deviceName+" ");
                if(deviceName.equals("GalaxyTabAwithSPen")) {
                    mmDevice = device;
                    break;
                }
            }
        }

        // tel GalaxyTabAwithSPen
        // tablet GhhBbbGalaxyS

    }

    void openBT()
    {
        if(mmDevice==null)
            Log.i("test","notnull");
        ParcelUuid list[] = mmDevice.getUuids();
        for(ParcelUuid x: list){
            System.out.println(x.toString());
        }
        Log.i("size :"+list.length," "+list[1].toString());

        UUID uuid = UUID.fromString(list[1].toString()); //Standard SerialPortService ID
        //UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
        try {
            mmSocket = mmDevice.createRfcommSocketToServiceRecord(uuid);
            mmSocket.connect();
            mmOutputStream = mmSocket.getOutputStream();
            mmInputStream = mmSocket.getInputStream();
            beginListenForData();
            myLabel.setText("Bluetooth Opened");
        }
        catch (Exception ex){
            Log.i("IO ex : ", ex.getMessage());
        }
    }
    void beginListenForData()
    {
        final Handler handler = new Handler();
        final byte delimiter = 10; //This is the ASCII code for a newline character

        stopWorker = false;
        readBufferPosition = 0;
        readBuffer = new byte[1024];
        workerThread = new Thread(new Runnable()
        {
            public void run()
            {
                while(!Thread.currentThread().isInterrupted() && !stopWorker)
                {
                    try
                    {
                        int bytesAvailable = mmInputStream.available();
                        if(bytesAvailable > 0)
                        {
                            byte[] packetBytes = new byte[bytesAvailable];
                            mmInputStream.read(packetBytes);
                            for(int i=0;i<bytesAvailable;i++)
                            {
                                byte b = packetBytes[i];
                                if(b == delimiter)
                                {
                                    byte[] encodedBytes = new byte[readBufferPosition];
                                    System.arraycopy(readBuffer, 0, encodedBytes, 0, encodedBytes.length);
                                    final String data = new String(encodedBytes, "US-ASCII");
                                    readBufferPosition = 0;

                                    handler.post(new Runnable()
                                    {
                                        public void run()
                                        {
                                            myLabel.setText(data);
                                        }
                                    });
                                }
                                else
                                {
                                    readBuffer[readBufferPosition++] = b;
                                }
                            }
                        }
                    }
                    catch (IOException ex)
                    {
                        Log.i("IO ex read " ,ex.getMessage());
                        stopWorker = true;
                    }
                }
            }
        });

        workerThread.start();
    }

    void sendData() throws IOException
    {
        String msg = myTextbox.getText().toString();
        msg += "\n";
        mmOutputStream.write(msg.getBytes());
        myLabel.setText("Data Sent");
    }

当我单击同时打开平板电脑和手机时，myLabel文本成功更改为“蓝牙已打开”。

但是，当我尝试从平板电脑向手机发送文字或从手机向桌面发送文字时，什么也没发送。数据侦听器正在工作。 mmInputStream.available（）始终返回0。

一些日志详细信息：

D/BluetoothUtils: isSocketAllowedBySecurityPolicy start : device null
W/BluetoothAdapter: getBluetoothService() called with no BluetoothManagerCallback
D/BluetoothSocket: connect(), SocketState: INIT, mPfd: {ParcelFileDescriptor: FileDescriptor[49]}