android java.io.ioException：传输endpoint未连接

Question

public class MainActivity extends Activity {

    TextView out;
    private static final int REQUEST_ENABLE_BT = 1;
    private BluetoothAdapter btAdapter;
    private ArrayList<BluetoothDevice> btDeviceList = new ArrayList<BluetoothDevice>();
    private ArrayAdapter<String> mPairedDevicesArrayAdapter;
    private ArrayAdapter<String> mNewDevicesArrayAdapter;
    BluetoothDevice device1;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        out = (TextView) findViewById(R.id.out);
        btAdapter = BluetoothAdapter.getDefaultAdapter();
        ListpairedDevices();
    }

    /* This routine is called when an activity completes. */
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == REQUEST_ENABLE_BT) {
            CheckBTState();
        }
    }

    public void ListpairedDevices() {
        Set<BluetoothDevice> pairedDevices = btAdapter.getBondedDevices();

        // If there are paired devices, add each one to the ArrayAdapter
        if (pairedDevices.size() > 0) {
            out.append("\nPaired Devices \n");
            for (BluetoothDevice device : pairedDevices) {
                out.append("\n  Device123: " + device.getName() + "," + device);
                //mPairedDevicesArrayAdapter.add("\n  Device123: " + device.getName() + "," + device);
                String dv=device.toString();
                if(dv.contains("00:1B:EE:82:31:1E"))
                {
                device1=device;
                }
            }
        } else {
            out.append("\nNo Pared Device");
        }
        out.append("\nDiscovered Devices");
    }

    public void sendtext(View v) {//button click

    Set<BluetoothDevice> bd=btAdapter.getBondedDevices();
    sendDataToPairedDevice("message1");
    }
    private void sendDataToPairedDevice(String message ){       
        byte[] toSend = message.getBytes();
        try {
         UUID applicationUUID = UUID.fromString("8ce255c0-200a-11e0-ac64-0800200c9a66");
         BluetoothSocket socket = device1.createInsecureRfcommSocketToServiceRecord(applicationUUID);
         OutputStream mmOutStream = socket.getOutputStream();
         mmOutStream.write(toSend);
     } catch (IOException e) {
         Log.e( "Exception during write", e.toString());
     }
 }
}

Answer 1

编辑：

您需要连接到套接字，在此之前，您需要取消发现

 btAdapter.cancelDiscovery();
 socket.connect();

UUID曾为Kiran K J is工作

btAdapter=BluetoothAdapter.getDefaultAdapter();