Android bluetooth:java.io.IOException:传输端点未连接

时间:2014-01-31 12:36:45

标签: java android exception bluetooth

我在Android中遇到蓝牙串行连接问题。有两个场景:

  1. 一个Activity(带片段),一个EditTex和一个Button(片段中)。该按钮与串行设备建立连接并从EditText发送数据。这是工作,但是...我不想每次建立连接。

  2. 一个Activity(带片段),一个EditTex和两个Button(片段中)。一个按钮建立连接而另一个按钮发送数据,好吧,当我按下连接按钮时它似乎工作正常(没有例外)但是当我按下发送数据按钮时,logcat显示我:

  3. java.io.IOException:传输端点未连接”

    当然,数据不会到达接收方。抛出

    是个例外
    out.write(txtData.getText().toString().getBytes());
    

    我的代码是(我想要的第二个风景):

    public class MainFragment extends Fragment implements View.OnClickListener {
        private EditText txtData;
        private Button btnSend;
        private Button btnConnect;
        private InputStream in = null;
        private byte[] buffer = null;
        BluetoothSocket socket = null;
        OutputStream out = null;
    
        public MainFragment(){}
    
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_main, container, false);
            txtData = (EditText) rootView.findViewById(R.id.txtData);
            btnSend = (Button) rootView.findViewById(R.id.btnSend);
            btnConnect = (Button) rootView.findViewById(R.id.btnConnect);
            btnConnect.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    connectBluetooth();    
                }
            });
            btnSend.setOnClickListener(this);
            return rootView;
        }
    
        public void connectBluetooth(){
            BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
            if (adapter == null) {
                // Device does not support Bluetooth
                getActivity().finish(); //exit
            }
    
            if (!adapter.isEnabled()) {
    //make sure the device's bluetooth is enabled
                Intent enableBluetooth = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
                startActivityForResult(enableBluetooth, 0);
            }
    
            final UUID SERIAL_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"); //UUID for serial connection
            String mac = "00:1B:35:0B:75:BE"; //my device's mac adress
            BluetoothDevice device = adapter.getRemoteDevice(mac); //get remote device by mac, we assume these two devices are already paired
    
    
            // Get a BluetoothSocket to connect with the given BluetoothDevice
    
            try {
                socket = device.createRfcommSocketToServiceRecord(SERIAL_UUID);
            } catch (IOException e) {
                Log.d("socket","Error al crear el socket");
            }
    
            try {
    
                socket.connect();    
                out = socket.getOutputStream();
                in = socket.getInputStream();
                out.write(txtData.getText().toString().getBytes());
            } catch (IOException e) {
            }
        }
    
        @Override
        public void onClick(View view) {
            try {    
                out.write(txtData.getText().toString().getBytes());
            } catch (IOException e) {
                e.printStackTrace();
            }
    
        }
    

    编辑:这不是其他蓝牙设备的问题,因为我在谷歌播放中使用应用程序对其进行了测试,但它确实有效。

2 个答案:

答案 0 :(得分:1)

在发送数据之前,您确定这两台设备是否已连接?

此外,您应该在不在主线程上的单独线程中进行所有蓝牙连接。

答案 1 :(得分:1)

最后,我使用createInsecureRfcommSocketToServiceRecord(SERIAL_UUID)代替createRfcommSocketToServiceRecord(SERIAL_UUID)

解决了我的问题