java - 从蓝牙连接接收字节

Question

我有一个连接到蓝牙模块以发送和接收数据的 android 应用程序。在发送逻辑中，它工作正常并正确发送数据。

变量：

  private BluetoothSocket bluetoothSocket;
  private BluetoothDevice bluetoothDevice;
  private static InputStream inputStream;
  private OutputStream outputStream;

连接到模块：

private void connectToDevice(String address) {
    UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805f9b34fb"); //Standard SerialPortService ID
    BluetoothSocket tmp;
    BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
    BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);
    try {
      tmp = device.createRfcommSocketToServiceRecord(MY_UUID);
    } catch (IOException e) {
      Snackbar.make(parentLayout, e.getMessage(), Snackbar.LENGTH_LONG)
          .setAction("IOException", null).show();
      return;
    }
    bluetoothDevice = device;
    bluetoothSocket = tmp;

    mBluetoothAdapter.cancelDiscovery();

    try {
      bluetoothSocket.connect();
    } catch (IOException connectException) {
      Snackbar.make(parentLayout, connectException.getMessage(), Snackbar.LENGTH_LONG)
          .setAction("IOException", null).show();
      try {
        bluetoothSocket.close();
      } catch (IOException closeException) {
        Snackbar.make(parentLayout, closeException.getMessage(), Snackbar.LENGTH_LONG)
            .setAction("IOException", null).show();
      }
      return;
    }

    try {
      outputStream = bluetoothSocket.getOutputStream();
      inputStream = bluetoothSocket.getInputStream();
    } catch (IOException e) {
      Snackbar.make(parentLayout, e.getMessage(), Snackbar.LENGTH_LONG)
          .setAction("IOException", null).show();

    }
  }

发送逻辑：

public void SendMessage(byte Destination, byte Source, int Code, byte[] Payload) {
    if (Code > 255)
      Opt2_16_BIT_Code = "1";
    else
      Opt2_16_BIT_Code = "0";
    String optionsString = Opt8_Next_Message +
        Opt67_Response_Options +
        Opt5_Reserved +
        Opt34_Trace_Options +
        Opt2_16_BIT_Code +
        Opt1_Extended_Flag;
    byte Options = GetBytes(optionsString)[1];  // 00100000 // 0x20

    Message _Message = new Message(Destination, Source, Options, Code, Payload);
    AllMessage = _Message.GetAll();  // We get the whole buffer bytes to be sent to the Hexabitz modules.


    try {
      outputStream.write(AllMessage, 0, AllMessage.length);
    } catch (IOException e) {
      Snackbar.make(parentLayout, e.getMessage(), Snackbar.LENGTH_LONG)
          .setAction("IOException", null).show();
    }

  }

以上所有工作都很好，但是当我来接收数据时，即使在调试模式下，应用程序也根本没有响应。

这是接收逻辑，我正在使用 AsyncTask，因为在正常模式下它会冻结主 UI：

public static class ReceiveDataTask extends AsyncTask<String, String, String> {

    @Override
    protected void onPreExecute() {

    }

    @Override
    protected void onPostExecute(String r) {

    }

    @Override
    protected String doInBackground(String... strings) {
      InputStream socketInputStream = inputStream;
      byte[] buffer = new byte[256];
      int bytes;


      // Keep looping to listen for received messages
      while (true) {
        try {
          bytes = socketInputStream.read(buffer);            // Here its falling asleep and dosen't respond at all!
          String readMessage = new String(buffer, 0, bytes);
          testLBL.setText(readMessage);
          // Send the obtained bytes to the UI Activity via handler
          Log.i("logging", readMessage + "");
        } catch (IOException e) {
          Snackbar.make(parentLayout, e.getMessage(), Snackbar.LENGTH_LONG)
              .setAction("IOException", null).show();

          break;
        }
      }
      return null;
    }
  }

任何建议或如何接收数据，这将是一个字节流。

标签： javaandroidbluetooth