基于Android蓝牙聊天示例的应用程序发现服务失败

Question

我正在写一个蓝牙游戏与蓝牙部分基于Android蓝牙聊天样本。我有两部手机要测试。问题在这里，当我将一部手机连接到另一部手机时，它有时会显示“无法连接设备”捆绑包，但当我运行蓝牙聊天示例时，它从未显示这一点，所以我认为这不是设备的问题。有没有人研究过蓝牙聊天样本，有同样的问题，会给我一些帮助？

我尝试打印异常，它就像“java.io.IOExc0019：服务发现失败”。这是导致异常的代码。

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

    public ConnectThread(BluetoothDevice device) {
        mmDevice = device;
        BluetoothSocket tmp = null;

        // Get a BluetoothSocket for a connection with the
        // given BluetoothDevice
        try {
            tmp = device.createRfcommSocketToServiceRecord(MY_UUID);
        } catch (IOException e) {
            Log.e(TAG, "create() failed", e);
        }
        mmSocket = tmp;
    }

    public void run() {
        Log.i(TAG, "BEGIN mConnectThread");
        setName("ConnectThread");

        // Always cancel discovery because it will slow down a connection
        mAdapter.cancelDiscovery();

        // Make a connection to the BluetoothSocket
        try {
            // This is a blocking call and will only return on a
            // successful connection or an exception
            mmSocket.connect();
        } catch (IOException e) {
            Log.e("error", e.toString());
            connectionFailed();
            // Close the socket
            try {
                mmSocket.close();
            } catch (IOException e2) {
                Log.e(TAG, "unable to close() socket during connection failure", e2);
            }
            // Start the service over to restart listening mode
            BluetoothChatService.this.start();
            return;
        }

        // Reset the ConnectThread because we're done
        synchronized (BluetoothChatService.this) {
            mConnectThread = null;
        }

        // Start the connected thread
        connected(mmSocket, mmDevice);
    }

    public void cancel() {
        try {
            mmSocket.close();
        } catch (IOException e) {
            Log.e(TAG, "close() of connect socket failed", e);
        }
    }
} 

确切位置是
mmSocket。连接（）




Answer 1

我知道你会觉得答案很奇怪，说实话，我不太擅长UUID。但我也遇到了同样的问题，用这个解决了。

回答
我想你正在使用在Bluetoothchat应用程序中硬编码的UUID。当我将这些UUID更改为众所周知的UUID即00001105-0000-1000-8000-00805F9B34FB时，它解决了我的问题，我不再得到IOException--Service Discovery失败。

所以，我建议你改变：

来自：

private static final UUID MY_UUID_SECURE =
    UUID.fromString("ea87c0d0-afac-11de-8a39-0800200c9a66");
private static final UUID MY_UUID_INSECURE =
    UUID.fromString("7ce255c0-200a-11e0-ac64-0800200c9a66");

到

private static final UUID MY_UUID_SECURE = 
    UUID.fromString("00001105-0000-1000-8000-00805F9B34FB");
private static final UUID MY_UUID_INSECURE = 
    UUID.fromString("00001105-0000-1000-8000-00805F9B34FB");

这个答案的来源。