无法连接蓝牙设备

Question

我试图连接蓝牙设备，希望将数据发送到该设备，同时也希望从该设备接收数据。

为了实现这一点，我遵循android开发者蓝牙文档，但似乎无法连接另一个设备，因为连接时它会抛出以下异常。

09-13 13:27:56.913: I/BluetoothConnect(2980): Connect exception:-java.io.IOException: [JSR82] connect: Connection is not created (failed or aborted).    

我遵循的步骤.

1. 启用蓝牙 意图turnOnIntent =新意图( BluetoothAdapter.ACTION_REQUEST_ENABLE)；startActivityForResult(turnOnIntent，REQUEST_ENABLE_BT)；
2. 获取蓝牙配对DeviceSet bondSet = myBluetoothAdapter.getBondedDevices()；ArrayList> bondedhDevicesList =新ArrayList>()；for (Iterator it = bondSet.iterator()；it.hasNext();) { BluetoothDevice bluetoothDevice = (BluetoothDevice) it.next()；HashMap map = new HashMap()；HashMap
3. 获取devicebluetoothDevice =myBluetoothAdapter.getRemoteDevice(地址)的UUID；// min 15！方法m；尝试{m= bluetoothDevice.getClass()。getMethod("fetchUuidsWithSdp"，(Class[]) null)；m.invoke(bluetoothDevice，(Object[]) null )；} catch (NoSuchMethodException IllegalAccessException IllegalArgumentException InvocationTargetException e) { // TODO自动生成的catch e.printStackTrace()}；
4. 连接到设备

​

   private static final UUID MY_UUID = UUID.fromString("fa87c0d0-afac-11de-8a39-0800200c9a66");

    public ConnectThread(BluetoothDevice device, String uuid, BluetoothAdapter mBluetoothAdapter) {
    // Use a temporary object that is later assigned to mmSocket,
    // because mmSocket is final
    BluetoothSocket tmp = null;
    this.mBluetoothAdapter = mBluetoothAdapter;
    mmDevice = device;

    Method m;
    try {
        mBluetoothAdapter.cancelDiscovery();
        mmSocket = device.createInsecureRfcommSocketToServiceRecord(MY_UUID);
        m = device.getClass().getMethod("createInsecureRfcommSocket", new Class[] {int.class});
        mmSocket = (BluetoothSocket) m.invoke(device, 1);   
    } catch (IOException |  IllegalArgumentException | IllegalAccessException | InvocationTargetException | NoSuchMethodException  e) {
        // TODO Auto-generated catch block
        Log.i("BluetoothConnect", e.toString());
        e.printStackTrace();
     }

     //mBluetoothAdapter.cancelDiscovery();
     //socket.connect();
    } 
    public void run() {
    // Cancel discovery because it will slow down the connection
    mBluetoothAdapter.cancelDiscovery(); 
    try {
        // Connect the device through the socket. This will block
        // until it succeeds or throws an exception
        mmSocket.connect();
        Constants.globalSocket = mmSocket;
    } catch (IOException connectException) {
        // Unable to connect; close the socket and get out
        Log.i("BluetoothConnect", "Connect exception:-"+connectException.toString());
        try {
            mmSocket.close();
        } catch (IOException closeException) { 
            Log.i("BluetoothConnect", "close exception:-"+closeException.toString());
        }
        return;
    }         
}

但是在连接的时候，我得到了这个例外。

1. 写到设备上。

public ConnectedThread(BluetoothSocket socket) {
    mmSocket = socket;
    InputStream tmpIn = null;
    OutputStream tmpOut = null;


    // Get the input and output streams, using temp objects because
    // member streams are final
    try {
        tmpIn = socket.getInputStream();
        tmpOut = socket.getOutputStream();
    } catch (IOException e) { }

    mmInStream = tmpIn;
    mmOutStream = tmpOut;
   } 
   public void run() {
    byte[] buffer = new byte[1024];  // buffer store for the stream
    int bytes; // bytes returned from read()

    // Keep listening to the InputStream until an exception occurs
    while (true) {
        try {
            // Read from the InputStream
            bytes = mmInStream.read(buffer);

            // Send the obtained bytes to the UI activity
            CreatePacket.mHandler.obtainMessage(MESSAGE_READ , bytes, -1, buffer)
                    .sendToTarget();
        } catch (IOException e) {
            Log.i("ConnectedThread", "while receiving data:-"+e.toString());
            break;
        }
      }
     }       


  public void write(byte[] bytes) {
    Log.i("ConnectedThread", "data while writing:-"+bytes.toString());
    try {
        mmOutStream.write(bytes);
    } catch (IOException e) {
        Log.i("ConnectedThread", "while writing data to bluetooth:-"+e.toString());
    }
  }    

如果我仍然尝试编写数据，那么我将得到以下异常。

请给我任何提示或参考。

09-13 13:48:55.079: I/ConnectedThread(2980): while writing data to bluetooth:-java.io.IOException: socket closed

我被困在过去三天，但仍然没有得到任何解决办法。

Answer 1

最好的方法是引用Android提供的示例聊天应用程序。这涵盖了所有必要的任务，如列出可用的设备，建立连接，发送数据和接收等。你可以得到和参考。https://android.googlesource.com/platform/development/+/eclair-passion-release/samples/BluetoothChat

Answer 2

下面是我用来连接蓝牙模块的一个示例代码。

public class OpenBluetoothPort extends AsyncTask<String, Void, BluetoothSocket> {

    private final UUID SPP_UUID = UUID
            .fromString("00001101-0000-1000-8000-00805F9B34FB");
    private BluetoothAdapter mBluetoothAdapter;
    private OnBluetoothPortOpened mCallback;
    private BluetoothSocket mBSocket;

    public interface OnBluetoothPortOpened {
        public void OnBluetoothConnectionSuccess(BluetoothSocket socket);
        public void OnBluetoothConnectionFailed();
    }

    public OpenBluetoothPort(Context context, OnBluetoothPortOpened callback) {
        mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
        mCallback = callback;
    }

    @Override
    protected BluetoothSocket doInBackground(String... params) {
        if(mBluetoothAdapter.isEnabled()) {
            try {
                for(BluetoothDevice bt: mBluetoothAdapter.getBondedDevices()) {
                    if(bt.getName().equalsIgnoreCase(params[0])) {
                        BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(bt.getAddress());
                        mBluetoothAdapter.cancelDiscovery();

                        mBSocket = device.createRfcommSocketToServiceRecord(SPP_UUID);
                        mBSocket.connect();
                        return mBSocket;
                    }
                }
            } catch(IOException e) {
                if(mBSocket != null) {
                    try {
                        mBSocket.close();
                    } catch (IOException e1) {
                        Log.i("Bluetooth Close Exception","Error in closing bluetooth in OpenBluetoothPort.class");
                        e1.printStackTrace();
                    }
                    mBSocket = null;
                }
                Log.i("Bluetooth Connect Exception","Error in connecting in OpenBluetoothPort.class");
                e.printStackTrace();
                return null;
            }
        } 
        return null;
    }

    @Override
    protected void onPostExecute(BluetoothSocket result) {
        super.onPostExecute(result);
        if(result != null && result.isConnected()) {
            mCallback.OnBluetoothConnectionSuccess(result);
        } else {
            mCallback.OnBluetoothConnectionFailed();
        }
    }



}