android - 通过蓝牙发送文本字符串的异常

Question

我正在尝试通过蓝牙将字符串从我的 Nexus S 发送到另一台 android 设备。代码如下：

public boolean onContextItemSelected(MenuItem item) {
  AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo)
  item.getMenuInfo();
  if(item.getItemId() == 0)
  {
    BluetoothDevice selDev = pairedDevices.get(info.position);
    TelephonyManager tman = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
    byte[] toSend = "a text".getBytes();
            try 
            {
                BluetoothSocket socket = selDev.createInsecureRfcommSocketToServiceRecord(
                      UUID.fromString("00001105-0000-1000-8000-00805F9B34FB"));
                OutputStream out = socket.getOutputStream();
                out.write(toSend);

                return true;
            } 
            catch (Exception ex) {
                ex.printStackTrace();
                return false;
            }
    }
    return true;
}

但我总是得到这个 IO 异常：java.io.IOException: Transport endpoint is not connected

怎么了？

Answer 1

我发现使用安全连接解决了我的问题。但在您的情况下，您需要调用connect()以启动连接。

//Just in case cancel any discovery as this slows everything down
selDev.CancelDiscovery();

//Try the secure method too. I found that worked for me.
BluetoothSocket socket = selDev.createInsecureRfcommSocketToServiceRecord(
                      UUID.fromString("00001105-0000-1000-8000-00805F9B34FB"));

socket.Connect();

OutputStream out = socket.getOutputStream();