Question

我无法通过Android手机连接蓝牙模块。我使用这个代码编写了几个应用程序，它们似乎都运行良好，然后突然间没有一个工作（即使我没有更改其中任何一个的代码）。这对其他蓝牙模块来说不是问题，因为我仍然可以很好地连接Blueterm应用程序。所以我想知道可能是什么问题。

public void connect() throws IOException {
    BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();

    // ensure that the device is bluetooth enabled
    if (adapter != null) {

        // enable the bluetooth adapter (if not done so already)
        if (!adapter.isEnabled())
            BluetoothAdapter.getDefaultAdapter().enable();

        // connect to hardcoded device
        BluetoothDevice device = adapter.getRemoteDevice(MAC_ADDRESS);

        Log.d("", device.toString());

        pairDevice(device);

        ParcelUuid[] uuids = device.getUuids();

        uuids = device.getUuids();

        socket = device.createRfcommSocketToServiceRecord(uuids[0].getUuid());

        socket.connect();
        outputStream = socket.getOutputStream();
    }
}

public boolean isConnected() {
    return socket.isConnected();
}

private void disconnect() {
    BluetoothAdapter.getDefaultAdapter().disable();
}

private void pairDevice(BluetoothDevice device) {
    try {
        Log.d("pairDevice()", "start pairing...");
        Method m = device.getClass().getMethod("createBond", (Class[])null);
        m.invoke(device, (Object[])null);
        Log.d("pairDevice()", "pairing finished.");
    } catch(Exception e) {
        Log.e("pairDevice()", e.getMessage());
    }
}

connect（）方法中的socket.connect（）行引发IOError，我不知道原因。

这是Logcat输出：

D/pairDevice()(9589): start pairing...
D/pairDevice()(9589): pairing finished.
D/BluetoothUtils(9589): isSocketAllowedBySecurityPolicy start : device null
W/BluetoothAdapter(9589): getBluetoothService() called with no BluetoothManagerCallback
D/BluetoothSocket(9589): connect(), SocketState: INIT, mPfd: {ParcelFileDescriptor: FileDescriptor[66]}

Android Socket.Connect（）抛出错误

0 个答案: