Question

我是android和java的新手所以要温柔:) 我正试图通过bloototh连接两部手机。我正在制作两部手机，通过创建serversocket来监听来电，然后从一部手机（作为客户端）初始化连接。有趣的是，当我试图让我的LG（Android版本2.3.4）连接HTC（Android 2.2.1）一切正常，但当我尝试使HTC手机连接作为客户端我没有得到任何结果。调试器显示HTC在mmSocket.connect（）时失败;并执行catch（IOException connectException）。我的代码基本上是从android蓝牙教程复制/粘贴。有什么建议为什么手机的行为不同？连线：

    private class ConnectThread extends Thread {
    private final BluetoothSocket mmSocket;
    private final BluetoothDevice mmDevice;

    public ConnectThread(BluetoothDevice device) {
        // Use a temporary object that is later assigned to mmSocket,
        // because mmSocket is final
        BluetoothSocket tmp = null;
        mmDevice = device;
        // Get a BluetoothSocket to connect with the given BluetoothDevice
        try {
            // MY_UUID is the app's UUID string, also used by the server code
            tmp = device.createRfcommSocketToServiceRecord(MY_UUID);
        } catch (IOException e) { }
        mmSocket = tmp;
    }

    public void run() {
        // Cancel discovery because it will slow down the connection
        BtAdapter.cancelDiscovery();
        try {
            // Connect the device through the socket. This will block
            // until it succeeds or throws an exception
            mmSocket.connect(); **HTC phones fails here and goes to CATCH block**
            // make info message
            Message msg = mainHandler.obtainMessage();
            Bundle bundle = new Bundle();
            String btnTxt = "Connected";
            bundle.putString("myKey", btnTxt);
            msg.setData(bundle);
            mainHandler.sendMessage(msg);
        } catch (IOException connectException) {
            // Unable to connect; close the socket and get out
            try {
                mmSocket.close();
            } catch (IOException closeException) { }
            return;
        }
        // Do work to manage the connection (in a separate thread)
        ConnectedThread conThread = new ConnectedThread(mmSocket);
        conThread.start();
    }

    /** Will cancel an in-progress connection, and close the socket */
    public void cancel() {
        try {
            mmSocket.close();
        } catch (IOException e) { }
    }
}

Answer 1

可能存在问题

tmp = device.createRfcommSocketToServiceRecord(MY_UUID);

在您的HTC 2.21设备上。检查HTC设备的Bluetoth适配器支持哪些功能，这可能与您的程序失败有关。

“仅当可以使用经过身份验证的套接字链接时才使用此套接字。   身份验证是指要防止的链接密钥的身份验证   中间人类型的攻击。例如，对于蓝牙2.1   设备，如果任何设备没有输入和输出   功能或只是能够显示数字键，一个安全   套接字连接是不可能的。在这种情况下，请使用{#link   createInsecureRfcommSocketToServiceRecord}。有关更多详细信息，请参阅   蓝牙核心规范的安全模型部分5.2（第3卷）   版本2.1 + EDR。“

http://developer.android.com/reference/android/bluetooth/BluetoothDevice.html#createRfcommSocketToServiceRecord%28java.util.UUID%29

蓝牙只能单向工作

1 个答案: